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Montgomery County, Maryland
County of Montgomery
Intersection in Bethesda, Maryland.jpg
Potomac River - Great Falls 25.jpg
1101 Spring Street - Silver Spring, Maryland.jpg
Rockville Town Center.jpg
Billy Goat B Trail 8.jpg
Darnestown, MD farm panorama.jpg
Clockwise: Downtown Bethesda, Spring Street in Silver Spring, Billy Goat B Trail, rural Darnestown, Rockville town center, Great Falls on the Potomac River.
Flag of Montgomery County, Maryland Official seal of Montgomery County, Maryland
Coat of arms of Montgomery County, Maryland
Coat of arms
Official logo of Montgomery County, Maryland
French: Gardez Bien (English: Watch Well)
Location in the U.S. state of Maryland
Location in the U.S. state of Maryland
Country  United States
State  Maryland
Founded September 6, 1776
Named for Richard Montgomery
 • Total 506.91 sq mi (1,312.89 km2)
 • Land 493.11 sq mi (1,277.15 km2)
 • Water 13.80 sq mi (35.74 km2)
 • Total 1,062,061
 • Density 2,153.80/sq mi (831.59/km2)
Demonyms Montgomery Countyan, MoCoite
Time zone UTC−05:00 (Eastern [EST])
 • Summer (DST) UTC−04:00 (EDT)
ZIP Codes
Area codes
  • 301
  • 240
Seat (and largest city) Rockville
Congressional districts Maryland's
  • 3rd
  • 6th
  • 8th

Montgomery County is the most populous county in the State of Maryland, located adjacent to Washington, D.C. As of the 2020 census, the county's population was 1,062,061, increasing by 9.3% from 2010. The county seat and largest municipality is Rockville, although the census-designated place of Germantown is the most populous place within the county. Montgomery County is included in the Washington–Arlington–Alexandria, DC–VA–MD–WV metropolitan statistical area, which in turn forms part of the Baltimore–Washington combined statistical area. Most of the county's residents live in unincorporated locales, of which the most urban are Silver Spring and Bethesda, although the incorporated cities of Rockville and Gaithersburg are also large population centers, as are many smaller but significant places.

As one of the most affluent counties in the United States, Montgomery County also has the highest percentage (29.2%) of residents over 25 years of age who hold post-graduate degrees. The county has been ranked as one of the wealthiest in the United States. Like other inner-suburban Washington, D.C. counties, Montgomery County contains many major U.S. government offices, scientific research and learning centers, and business campuses, which provide a significant amount of revenue for the county.


The Maryland state legislature named Montgomery County after Richard Montgomery; the county was created from lands that had at one point or another been part of Frederick County. On September 6, 1776, Thomas Sprigg Wootton from Rockville, Maryland, introduced legislation, while serving at the Maryland Constitutional Convention, to create lower Frederick County as Montgomery County. The name, Montgomery County, along with the founding of Washington County, Maryland, after George Washington, was the first time in American history that counties and provinces in the thirteen colonies were not named after British referents. The name use of Montgomery and Washington County were seen as further defiance to Great Britain during the American Revolutionary War. The county's nickname of "MoCo" is derived from "Montgomery County", after the pattern of SoHo, Manhattan.

The county's motto, adopted in 1976, is "Gardez Bien", a phrase meaning "Watch Well". The county's motto is also the motto of its namesake's family.


Map of Montgomery County, Maryland. Compiled in the Bureau of Topographical Engineers from the latest and best... - NARA - 305573
Map of Montgomery County, Maryland. Compiled in the Bureau of Topographical Engineers from the latest and best authorities, September 1862.
Madison house brookeville
The Madison House in Brookeville was built around 1800 and originally owned by Caleb Bentley. The house provided refuge for President James Madison, on August 26, 1814, after the British burned Washington, D.C., during the War of 1812.
20111110-OC-AMW-0009 - Flickr - USDAgov
A Montgomery County farm in 1912.
North Frederick Avenue, Gaithersburg, Maryland, 1919
Downtown Gaithersburg in 1919.
Coat of arms of Montgomery County, Maryland (1975)
The former coat of arms of Montgomery County, used up until 1976.
Flag of Montgomery County, Maryland (1944-1976)
Small  vexillological symbol or pictogram in black and white showing the different uses of the flag The former flag of Montgomery County, used from May 3, 1944 to October 5, 1976.
North Frederick Avenue and Brookes Avenue, Gaithersburg, Maryland, February 19, 1956
Downtown Gaithersburg in February 1956.
Rockville railroad station
The Rockville Baltimore and Ohio Railroad station in January 2006. It was built in 1873.

Early history

Before European immigration, the land now known as Montgomery County was covered in a vast swath of forest crossed by the creeks and small streams that feed the Potomac and Patuxent rivers. A few small villages of the Piscataway, members of the Algonquian people, were scattered across the southern portions of the county. North of the Great Falls of the Potomac, there were few permanent settlements, and the Piscataway shared hunting camps and foot paths with members of rival peoples like the Susquehannocks and the Senecas.

Captain John Smith of the English settlement at Jamestown was probably the first European to explore the area, during his travels along the Potomac River and throughout the Chesapeake region.

These lands were claimed by Europeans for the first time when George Calvert, 1st Baron Baltimore was granted the charter for the colony of Maryland by Charles I of England. However, it was not until 1688 that the first tract of land in what is now Montgomery County was granted by the Calvert family to an individual colonist, a wealthy and prominent early Marylander named Henry Darnall. He and other early claimants had no intention of settling their families. They were little more than speculators, securing grants from the colonial leadership and then selling their lands in pieces to settlers. Thus, it was not until approximately 1715 that the first British settlers began building farms and plantations in the area.

These earliest settlers were English or Scottish immigrants from other portions of Maryland, German settlers moving down from Pennsylvania, or Quakers who came to settle on land granted to a convert named James Brooke in what is now Brookeville. Most of these early settlers were small farmers, growing wheat and a variety of other subsistence crops in addition to the region's main cash crop, tobacco. Many of the farmers owned slaves. They transported the tobacco they grew to market through the Potomac River port of Georgetown. Sparsely settled, the area's farms and taverns were nonetheless of strategic importance as access to the interior. General Edward Braddock's army traveled through the county on the way to its disastrous defeat at Fort Duquesne during the French and Indian War.

Like other regions of the American colonies, the region that is now Montgomery County saw protests against British taxation in the years before the American Revolution. In 1774, local residents met at Hungerford's Tavern and agreed to break off commerce with Great Britain. Following the signing of the Declaration of Independence, representatives of the area helped to draft the new state constitution and began to build a Maryland free of proprietary control. On September 6, 1776, the Maryland Constitutional Convention formed Montgomery County from lands that had at one point or another been part of Charles, Prince George's and Frederick Counties, naming it after General Richard Montgomery. The leaders of the new county chose as their county seat an area adjacent to Hungerford's Tavern near the center of the county, which later became Rockville. The newly formed Montgomery County supplied arms, food and forage for the Continental Army during the Revolution, in addition to soldiers.

In 1791, portions of Montgomery County, including Georgetown, were ceded to form the new District of Columbia, along with portions of Prince George's County, Maryland, as well as parts of Virginia that were later returned to Virginia.

19th century

In 1828, construction on the C&O Canal commenced and was completed in 1850. Laborers were. primarily Irish immigrants Throughout the 19th century, agriculture dominated the economy in Montgomery County, with slaves playing a significant role, though the vast majority of farmers owned 10 slaves or less rather than large plantations. In the first half of the 19th century, low tobacco prices and worn-out soil caused many tobacco farms to be abandoned. Crop production gradually shifted away from tobacco and toward wheat and corn. Prior to the Civil War, Montgomery County allied itself with other slaveholding counties in southern Maryland and the Eastern Shore. Montgomery County was important in the abolitionist movement, especially among the Quakers in the northern part of the county near Sandy Spring. Josiah Henson grew up as a slave on the Riley farm south of Rockville. He wrote about his experiences in a memoir which became the basis for Harriet Beecher Stowe's Uncle Tom's Cabin (1852). A slave cabin where he is believed to have spent time still stands at the end of a driveway off Old Georgetown Road.

Until 1860, only private schools existed in Montgomery County. Initially, schools for European American students were built. A school in Rockville for free African-Americans existed until 1866. Another school for African-Americans was opened by 1877 in Rockville.

Montgomery County's proximity to the nation's capital and split sympathies to North and South resulted in it being occupied by Union forces during the Civil War. The county was "invaded" on multiple occasions by Confederate and Union forces.

In 1855, work on the Metropolitan Branch of the Baltimore & Ohio Railroad began, in order to provide a route between Washington, D.C., and Point of Rocks, Maryland. In 1873, the railroad opened. The railroad spurred development at Takoma Park, Kensington, Garrett Park and Chevy Chase. By providing a much-needed transportation link, it also greatly increased the value of farmland and spurred the development of a dairy industry in the county.

20th and 21st centuries

On July 1, 1922, the Montgomery County Police Department was established. Prior to that time, law enforcement duties rested in the Montgomery County Sheriff and designated constables. In 1922, the police department consisted of three to six officers who were appointed to two-year terms by the Board of County Commissioners, one of whom would be appointed as Chief. In 1927, the police department was enlarged to twenty officers.

The remains of author F. Scott Fitzgerald, best known for the novel The Great Gatsby, are interred at Rockville Cemetery.

Home rule

The county began with most legislative power in the hands of the Maryland state government, with a five-person Montgomery County Board of Commissioners who oversaw the administration of the county but could neither pass county laws nor enact policies.

In 1915, Maryland amended its constitution. According to the constitutional amendment, a county's residents may propose a petition to create a nonpartisan Charter Board. If the petition receives signatures from at least twenty percent of the county's registered voters, all county residents would vote to select the members of the Charter Board during the next general election. The Charter Board would be authorized to draft a new system of county government, which could include a county council with the power to enact legislation and policies. Charter Board's proposal would then be voted upon by registered voters during the following general election, and it would be enacted if approved by the voters.

The county commissioners authorized the Brookings Institution to study the existing county government structure and suggest recommendations in 1938. The 720-page report opined that the county had outgrown its form of government. The study recommended the creation of a nonpartisan county council consisting of nine members representing defined districts of the county who could pass legislation, determine policy, and control over the administration of the county. The study also recommended the hiring of a county administrator, the creation of an independent comptroller in charge of county finances, and a civil service commission. The Montgomery County Civic Federation praised the study for its comprehensiveness. The county commissioners appointed a citizen's committee to determine how to enact the study's recommendations. The county commissioners strongly criticized the recommendation to create a county council, both because the council would be nonpartisan and because each county resident would be able to vote for only one representative rather than for all nine.

In 1942, Montgomery County Charter Committee was organized, which was formed primarily to circulate petitions to form a Charter Board. The Charter Board petitioned to form a county council with the power to pass laws without the consent of the Maryland General Assembly and with authority over the administration the county. While the Democratic Party did not explicitly denounce the charter, it issued a statement calling out the ostensibly nonpartisan movement for hidden partisan goals and claimed that backers of the charter petition for their alleged personal and political attacks on the Democratic Party and its officials. The newly formed Independent Party endorsed the charter, praising county residents' goal of improving their form of government. In the November 1942 election, county residents voted in favor of forming a Charter Board.

In 1943, the Charter Board released its draft charter. The council would have nine unpaid members, of which five would represent each of five single-member districts and four would represent the county at-large. Council seats would be nonpartisan, each seat would be held for four years, and elections would occur every two years. The council would have the power to enact legislation and hire a county manager, to whom all governmental department heads would report. All sessions of the council would be open to the public. The office of county treasurer would be abolished and replaced by a director of finance, who would be responsible for assessment and collection of taxes, assessments, and licenses, custody and disbursement of public funds and property, and preparation of monthly financial statements. A department of public works, department of education, department of safety, department of welfare, and department of health would also be created.

The Montgomery County Charter Board opened its campaign headquarters in Bethesda, to serve as an information center regarding the draft charter. The Charter Board emphasized that the draft charter would allow for county affairs to be decided by local representatives rather than by a vote of members of the Maryland General Assembly who represent citizens of all parts of the state. Another group opposing the draft charter opened its headquarters in Bethesda. The group said there was no good reason to abolish the functional state-level system already in place, and that the draft charter would increase taxes and establish heads of governmental agencies with indefinite terms who are not directly accountable to the public. The group also said that making the council seats nonpartisan would go against the country's political history. The editorial board of The Washington Post supported the draft charter. The Montgomery County League of Women Voters also endorsed the draft charter.

In a near-record turnout, a 1946 vote to enact a home-rule charter failed by a vote of 14,471 to 13,270. Following the vote, proponents of the charter said they would not give up the fight.

Several months later, Montgomery County Democratic Party leader Col. E. Brooke Lee said he would support Montgomery County home rule by way of an act of the Maryland state legislature. Lee proposed a bill to create a position of county supervisor, who would be in charge of routine county business, would appoint county employees subject to civil service rules and regulations, would supervise expenditures, and would prepare the operating and capital budgets. The bill did not disband the county commissioners or create a county council. The bill passed the state legislature and was signed by Governor Herbert R. O'Conor in 1945. The county commissioners appointed Willard F. Day to the position.

In 1948, by a vote of 17,809 in favor and 13,752 against, voters approved a charter for a "Council-Manager" form of government, making Montgomery County the first home-rule county in Maryland. The charter created an elected seven-member County Council with the power to pass local laws. All seven Council Members would be elected at-large by all county residents. Five would have to live in five different residence districts, while the other two could live anywhere within the county. The Council would serve as both the legislative and executive functions of the county. Council members would elect one of their own to serve as president of the Council. The charter also authorized the hiring of a county manager, the top administrative official, who could be dismissed by the Council after a public hearing. The charter created a department of public works, department of finance, and office of the county attorney, while it abolished the positions of county treasurer and police commissioner. The first County Council was elected in 1949.

County Executive

In 1962, a county civic group advocated for the election of a county executive. The group's report said that the new position would give citizens another place to go if their concerns were refused by the Montgomery County Council. The group said that the fact that the county had four appointed county managers in thirteen years demonstrates that establishing the position in 1948 had not been a stunning success. The group also advocated for nonpartisan elections for council members. Among the reasons for the suggested changes in governance is the fact that the county's population had more than doubled since the governmental system had been established in 1948.

In 1966, the Montgomery County Council adopted a proposed charter amendment to create a new elected position of County Executive. Elected to a four-year term, the County Executive could veto legislation passed by the County Council, although five members of the County Council could vote to overrule the veto. All Council Members would continue to be at-large, but they would need to live in seven different residence districts. Republicans favored a referendum on the proposed charter amendment, while Democrats favored it in principle but urged the specific amendment's defeat because the duties of the County Executive were not specific enough. In the referendum held in September 1966, the referendum was defeated, with 57 percent of voters opposed.

In February 1967, the Montgomery County Council formed a commission to draft a charter amendment to elect a county executive. The commission's plan was to separate the legislative and executive functions of government. The county council would continue to be the legislative branch of county government, and an elected full-time County Executive who could veto legislation passed by the Council; it would take five votes by the Council to override a veto. The County Executive would hire a chief administrative officer to supervise the daily operations of the government. All Council Members would be elected at-large by all county residents, but five of the seven would need to live in each of five different residential districts of substantially equal population. In November 1968, the charter amendment was approved, with 53 percent of votes in favor.

In the first election for County Executive, held in 1970, Republican James P. Gleason defeated Democrat William W. Greenhalgh by a margin of 420 votes.

In November 1986, voters amended the Charter to increase the number of Council seats in the 1990 election from seven to nine. Now five members are elected by the voters of their council district and four are elected at-large. Each voter may vote for five council members; four at-large and one from the district in which they reside.


In November 1995, the City of Takoma Park held a state-sponsored referendum asking whether the portions of the city in Prince George's County should be annexed to Montgomery County or vice versa. The majority of votes in the referendum were in favor of unification of the entire city in Montgomery County. Following subsequent approval by both counties' councils and the Maryland General Assembly, the county line was moved to include the entire city into Montgomery County (including territory in Prince George's County newly annexed by the city) on July 1, 1997. This added about 800 residents to Montgomery County's population.


According to the U.S. Census Bureau, the county has a total area of 507 square miles (1,310 km2), of which 491 square miles (1,270 km2) is land and 16 square miles (41 km2) (3.1%) is water. Montgomery County lies entirely inside the Piedmont plateau. The topography is generally rolling. Elevations range from a low of near sea level along the Potomac River to about 875 feet in the northernmost portion of the county north of Damascus. Relief between valley bottoms and hilltops is several hundred feet.

When Montgomery County was created in 1776, its boundaries were defined as "beginning at the east side of the mouth of Rock Creek on Potowmac river [sic], and running with the said river to the mouth of Monocacy, then with a straight line to Par's spring, from thence with the lines of the county to the beginning".

The county's boundary forms a sliver of land at the far northern tip of the county that is several miles long and averages less than 200 yards wide. In fact, a single house on Lakeview Drive and its yard is sectioned by this sliver into 3 portions, each separately contained within Montgomery, Frederick and Howard Counties. These jurisdictions and Carroll County meet at a single point at Parr's Spring on Parr's Ridge.


Montgomery County lies within the northern portions of the humid subtropical climate. It has four distinct seasons, including hot, humid summers and cool winters.

Precipitation is fairly evenly distributed throughout the year, with an average of 43 inches (110 cm) of rainfall. Thunderstorms are common during the summer months, and account for the majority of the average 35 days with thunder per year. Heavy precipitation is most common in summer thunderstorms, but drought periods are more likely during these months because summer precipitation is more variable than winter.

The mean annual temperature is 55 °F (13 °C). The average summer (June–July–August) afternoon maximum is about 85 °F (29 °C) while the morning minimums average 66 °F (19 °C). In winter (December–January–February), these averages are 44 °F (7 °C) and 28 °F (−2 °C). Extreme heat waves can raise readings to around and slightly above 100 °F (38 °C), and arctic blasts can drop lows to −10 °F (−23 °C) to 0 °F (−18 °C). For Rockville, the record high is 105 °F (41 °C) in 1954, while the record low is −13 °F (−25 °C).

Lower elevations in the south, such as Silver Spring, receive an average of 17.5 inches (44 cm) of snowfall per year. Higher elevations in the north, such as Damascus, receive an average of 21.3 inches (54 cm) of snowfall per year. During a particularly snowy winter, Damascus received 79 inches (200 cm) during the 2009–2010 season.


Historical population
Census Pop.
1790 18,003
1800 15,058 −16.4%
1810 17,980 19.4%
1820 16,400 −8.8%
1830 19,816 20.8%
1840 15,456 −22.0%
1850 15,860 2.6%
1860 18,322 15.5%
1870 20,563 12.2%
1880 24,759 20.4%
1890 27,185 9.8%
1900 30,451 12.0%
1910 32,089 5.4%
1920 34,921 8.8%
1930 49,206 40.9%
1940 83,912 70.5%
1950 164,401 95.9%
1960 340,928 107.4%
1970 522,809 53.3%
1980 579,053 10.8%
1990 757,027 30.7%
2000 873,341 15.4%
2010 971,777 11.3%
2020 1,062,061 9.3%
U.S. Decennial Census
1790–1960 1900–1990
1990–2000 2010 2020

Since the 1970s, the county has had in place a Moderately Priced Dwelling Unit (MPDU) zoning plan that requires developers to include affordable housing in any new residential developments that they construct in the county. The goal is to create socioeconomically mixed neighborhoods and schools so the rich and poor are not isolated in separate parts of the county. Developers who provide for more than the minimum amount of MPDUs are rewarded with permission to increase the density of their developments, which allows them to build more housing and generate more revenue. Montgomery County was one of the first counties in the U.S. to adopt such a plan, but many other areas have since followed suit.

Montgomery County is by far one of the most ethnically and culturally diverse counties in the United States; four of the ten most culturally diverse cities and towns in the U.S. are in Montgomery County: Gaithersburg, ranking second; Germantown, ranking third; Silver Spring, ranking fourth; and Rockville, ranking ninth. Gaithersburg, Germantown, and Silver Spring all rank as more culturally diverse than New York City, San Jose, and Oakland. Maryland overall is one of six minority-majority states, and the only minority-majority state on the East Coast.

2020 census

Montgomery County, Maryland - Demographic Profile
(NH = Non-Hispanic)
Race / Ethnicity Pop 2010 Pop 2020 % 2010 % 2020
White alone (NH) 478,765 430,980 49.27% 40.58%
Black or African American alone (NH) 161,689 192,714 16.64% 18.15%
Native American or Alaska Native alone (NH) 1,580 1,377 0.16% 0.13%
Asian alone (NH) 134,677 162,472 13.86% 15.30%
Pacific Islander alone (NH) 427 440 0.04% 0.04%
Some Other Race alone (NH) 3,617 8,589 0.37% 0.81%
Mixed Race/Multi-Racial (NH) 25,624 48,080 2.64% 4.53%
Hispanic or Latino (any race) 165,398 217,409 17.02% 20.47%
Total 971,777 1,062,061 100.00% 100.00%

Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos can be of any race.

2010 census

As of the 2010 United States census, there were 971,777 people, 357,086 households, and 244,898 families living in the county. The population density was 1,978.2 inhabitants per square mile (763.8/km2). There were 375,905 housing units at an average density of 765.2 per square mile (295.4/km2). The racial makeup of the county was 57.5% White, 17.2% Black or African American, 13.9% Asian, 0.4% American Indian, 0.1% Pacific islander, 7.0% from other races, and 4.0% from two or more races. Those of Hispanic or Latino origin made up 17.0% of the population. In terms of ancestry, 10.7% were German, 9.6% were Irish, 7.9% were English, 4.9% were Italian, 3.5% were Russian, 3.1% were Polish, 2.9% were American and 2% were French. People of Central American descent made up 8.1% of Montgomery County, with Salvadoran Americans constituting 5.4% of the county's population. Over 52,000 people of Salvadoran descent lived in Montgomery County, with Salvadoran Americans comprising approximately 32% of the county's Hispanic and Latino population. People of South American descent make up 3.8% of the county, with Peruvian Americans being the largest South American community, constituting 1.2% of the county's population.

Of the 357,086 households, 35.7% had children under the age of 18 living with them, 53.4% were married couples living together, 11.3% had a female householder with no husband present, 31.4% were non-families, and 25.0% of all households were made up of individuals. The average household size was 2.70 and the average family size was 3.22. The median age was 38.5 years.

The median income for a household in the county was $93,373 and the median income for a family was $111,737. Males had a median income of $71,841 versus $55,431 for females. The per capita income for the county was $47,310. About 4.0% of families and 6.0% of the population were below the poverty line, including 7.2% of those under age 18 and 6.3% of those age 65 or over.

2014 estimates

The United States Census Bureau estimated the county's population was 1,030,447 as of 2014. If it were a city, it would be the tenth-most-populous city in the U.S. after San Jose, California and Austin, Texas.

The ethnic makeup of the county was estimated to be the following in 2013:

In addition, 18.3% were Hispanic or Latino, of any race.

People who were born on continent of Africa are 6% of the county's total residents. The plurality of these were born in Ethiopia. People from China are the fastest-growing immigrant population in the county; people from Ethiopia are the county's second-fastest-growing immigrant population.

2016 estimates

The United States Census Bureau estimated the county's population as 1,043,863 as of 2016.

The race and Hispanic original of the county's residents was estimated to be the following as of 2016:

In addition, 19.1% were Hispanic or Latino, of any race.

Of residents age 25 or older, 91.2% have graduated high school, and 57.1% had a bachelor's degree.

Of the county's population, 32.6% were born outside the United States.

44,718 veterans lived in the county in 2016.

Of residents age 5 or older, 39.8% spoke a language other than English at home in 2016.

2018 estimates

As of July 1, 2018 The United States Census Bureau estimates the population of the county to be 1,052,567 residents.

The race and Hispanic origin of the county's residents are estimated to be:

The age of the county's residents are estimated to be:

  • 6.3% Persons under 5 years
  • 23.3% Persons under 18 years
  • 15.5% Persons 65 years and over.

An estimated 51.6% of the population is female.

The number of housing units is estimated to be 390,664.


Of Montgomery County's residents, 14% are Catholic, 5% are Baptist, 3% are Methodist, 1% are Presbyterian, 1% are Episcopalian, 1% are part of the Latter Day Saint movement, 1% are Lutheran, 6% are of another Christian faith, 3% are Jewish, 1% follows Islam, and 1% are of an eastern faith. Overall, 41% of the county's residents are affiliated with a religion.

Montgomery County has the largest Jewish population in the state of Maryland, accounting for 45% of Maryland Jews. According to the Berman Jewish DataBank, Montgomery County has a Jewish population of 105,400 people, around 10% of the county's population. The Greater Washington area, with 295,500 Jews, has become the third-largest Jewish population in the United States.



2019-07-12 11 25 04 View north along Interstate 270 (Washington National Pike) from the overpass for West Gude Drive in Rockville, Montgomery County, Maryland
I-270 northbound in Rockville

Poor transportation was a hindrance for Montgomery County's farmers who wanted to transport their crops to market in the early 18th century. Montgomery County's first roads, often barely adequate, were built by the 18th century.

One early road connected Frederick and Georgetown. There was a road that connected Georgetown and the mouth of the Monocacy River. Plans to continue the road to Cumberland did not come to fruition. Another road connected the Montgomery County Courthouse with Sandy Spring and Baltimore, and one other road connected the courthouse with Bladensburg and Annapolis.

The county's first turnpike was chartered in 1806, but its construction began in 1817. In 1828, the turnpike was completed, running from Georgetown to Rockville. It was the first paved road in Montgomery County.

In 1849, the Seventh Street Turnpike (now called Georgia Avenue) was extended from Washington to Brookeville. The Colesville–Ashton Turnpike was built in 1870 (now parts of Colesville Road, Columbia Pike, and New Hampshire Avenue).

The United States Army Corps of Engineers built the Washington Aqueduct between 1853 and 1864, to supply water from Great Falls to Washington. The aqueduct was covered in 1875, and it became known as Conduit Road. The Union Arch Bridge, which carries the aqueduct across Cabin John Creek, was the longest single-arch bridge in the world at the time it was completed in 1864. The road is now named MacArthur Boulevard.

Major Highways and Roads

  • I-270

  • I-270 Spur
  • I-370
  • I-495
  • US 29
  • MD 27
  • MD 28
  • MD 97
  • MD 107
  • MD 108
  • MD 109
  • MD 112
  • MD 115
  • MD 117
  • MD 118
  • MD 119
  • MD 121
  • MD 124
  • MD 182
  • MD 185
  • MD 186
  • MD 187
  • MD 188
  • MD 189
  • MD 190
  • MD 191
  • MD 198

  • MD 200 Toll
  • MD 320
  • MD 355
  • MD 390
  • MD 396
  • MD 410
  • MD 586
  • MD 650


Montgomery County operates its own bus public transit system, known as Ride On. Major routes closer to its rail service area are also covered by WMATA's Metrobus service.

The county began building a bus rapid transit (BRT) system along US 29 in 2018. The system will provide service between Silver Spring and Burtonsville and is scheduled to begin operation in 2020.

The Corridor Cities Transitway is a proposed BRT line that would provide an extension of the Red Line corridor from Gaithersburg to Germantown, and eventually to Frederick County.


Montgomery County is served by three passenger rail systems, with a fourth line under construction.

Amtrak, the U.S. national passenger rail system, operates its Capitol Limited to Rockville, between Washington Union Station and Chicago Union Station.

The Brunswick line of the MARC commuter rail system makes stops at Silver Spring, Kensington, Garrett Park, Rockville, Washington Grove, Gaithersburg, Metropolitan Grove, Germantown, Boyds, Barnesville, and Dickerson, where the line splits into its Frederick and Martinsburg branches.

Both suburban arms of the Red Line of the Washington Metro serve Montgomery County. It follows the CSX right of way to the west, roughly paralleling Route 355 from Friendship Heights to Shady Grove. The eastern side runs between the two tracks of the CSX right of way from Washington Union Station to Silver Spring, and roughly parallels Georgia Avenue, from Silver Spring to Glenmont.

The Purple Line, a light rail system, is currently under construction and is scheduled to open in 2022. The line will run in a generally east-west direction, connecting Montgomery and Prince George's Counties near the Beltway, with 21 stations. The Purple Line will connect directly with four Metro stations, MARC trains and Amtrak.


The Montgomery County Airpark (FAA GAI, ICAO KGAI), a general aviation facility in Gaithersburg, is the major airport in the county. Davis Airport (FAA Identifier W50), a privately owned airstrip, is located in Laytonsville on Hawkins Creamery Road. Commercial air service is provided at the nearby Ronald Reagan Washington National, Washington Dulles International, and BWI Airports.



Montgomery County is religiously diverse. Of Montgomery County's population, according to the Associations of Religion Data, 13% is Catholic, 5% is Baptist, 4% is Evangelical Protestant, 3% is Jewish, 3% is Methodist/Pietist, 2% is Adventist, 2% is Presbyterian, 1% is Episcopalian/Anglican, 1% is Mormon, 10% is Muslim, 1% is Lutheran, 1% is Eastern Orthodox, 1% is Pentecostal, 1% is Buddhist, and 1% is Hindu.

The Seventh-day Adventist Church maintains its General Conference headquarters in Silver Spring, Maryland.


Bethesda's Congressional Country Club has hosted four Major Championships, including three playings of the U.S. Open, most recently in 2011 which was won by Rory McIlroy. The Club also hosts the Quicken Loans National, an annual event on the PGA Tour which benefits the Tiger Woods Foundation. Previously, neighboring TPC at Avenel hosted the Booz Allen Classic.

The Bethesda Big Train, Rockville Express, and Silver Spring-Takoma Thunderbolts all play college level wooden bat baseball in the Cal Ripken Collegiate Baseball League.

Montgomery County is home of the Montgomery County Swim League, a youth (ages 4–18) competitive swimming league composed of ninety teams based at community pools throughout the county.

There are future possibilities of a minor league baseball team forming to play for the Atlantic League of Professional Baseball to represent Montgomery County.

Montgomery County Agricultural Fair

Montgomery County Fairgrounds
Montgomery County Fairgrounds

Since 1949 the Montgomery County Agricultural Fair, the largest in the state, showcases farm life in the county. The week long event offers family events, carnival rides, live animals, entertainment and food. Visitors can also view entries of canned and baked goods, clothing, quilts and produce from local county farmers.


Gaithersburg, Maryland
East Middle Lane Rockville Maryland
Takoma Park downtown
Takoma Park




Special Tax Districts

Occupying a middle ground between incorporated and unincorporated areas are Special Tax Districts, quasi-municipal unincorporated areas created by legislation passed by either the Maryland General Assembly or the county. The Special Tax Districts generally have limited purposes, such as providing some municipal services or improvements to drainage or street lighting. Special Tax Districts lack home rule authority and must petition their cognizant governmental entity for changes affecting the authority of the district. The four incorporated villages of Montgomery County and the town of Chevy Chase View were originally established as Special Tax Districts. Four Special Tax Districts remain in the county:

Census-designated places

Unincorporated areas are also considered as towns by many people and listed in many collections of towns, but they lack local government. Various organizations, such as the United States Census Bureau, the United States Postal Service, and local chambers of commerce, define the communities they wish to recognize differently, and since they are not incorporated, their boundaries have no official status outside the organizations in question. The Census Bureau recognizes the following census-designated places in the county:

Bethesda downtown panorama
2007 11 01 - 118@Wisteria - EB at Wisteria
Downtown silver spring wayne
Silver Spring

Unincorporated communities


Montgomery County is an important business and research center. It is the epicenter for biotechnology in the Mid-Atlantic region. Montgomery County, as third largest biotechnology cluster in the U.S., holds a large cluster and companies of large corporate size within the state. Biomedical research is carried out by institutions including Johns Hopkins University's Montgomery County Campus (JHU MCC), and the Howard Hughes Medical Institute (HHMI). Federal government agencies in Montgomery County engaged in related work include the Food and Drug Administration (FDA), the National Institutes of Health (NIH), the Uniformed Services University of the Health Sciences (USUHS), and the Walter Reed Army Institute of Research.

Many large firms are based in the county, including Coventry Health Care, Lockheed Martin, Marriott International, Host Hotels & Resorts, Travel Channel, Ritz-Carlton, Robert Louis Johnson Companies (RLJ Companies), Choice Hotels, MedImmune, TV One, BAE Systems Inc., Hughes Network Systems and GEICO.

Other U.S. federal government agencies based in the county include the National Oceanic and Atmospheric Administration (NOAA), Nuclear Regulatory Commission (NRC), U.S. Department of Energy (DOE), the National Institute of Standards and Technology (NIST), the Walter Reed National Military Medical Center (WRNMMC), and the U.S. Consumer Product Safety Commission (CPSC).

Downtown Bethesda and Silver Spring are the largest urban business hubs in the county; combined, they rival many major city cores.

Top employers

According to the county's comprehensive annual financial reports, the top employers by number of employees in the county are the following. "NA" indicates not in the top ten employers for the year given.

Employer Employees
U.S. Department of Health and Human Services 28,500 29,700 38,800
Montgomery County Public Schools 25,429 22,016 20,987
U.S. Department of Defense 12,000 12,690 13,800
County of Montgomery 10,815 8,849 8,272
U.S. Department of Commerce 5,500 8,250 6,200
Adventist Healthcare 4,900 5,310 6,000
Marriott International (headquarters) 4,700 5,441 NA
Lockheed Martin 4,000 4,745 3,900
Montgomery College 3,632 NA NA
Holy Cross Hospital of Silver Spring 3,400 NA NA
Nuclear Regulatory Commission 3,840 NA NA
Giant NA 3,842 4,900
Verizon NA 3,292 4,700
Chevy Chase Bank NA NA 4,700


Education in the county is provided by Montgomery County Public Schools, Montgomery College and other institutions.

Montgomery County Public Schools

Elementary and secondary public schools are operated by the Montgomery County Public Schools (MCPS). The county public school system is the largest school district in Maryland, serving about 162,000 students with 13,000 teachers and 10,000 support staff. The public school system operating budget for Fiscal Year 2019 is $2.6 billion.

MCPS operates under the jurisdiction of an elected Board of Education. Its current members are:

Name District Term Ends
Patricia O'Neill District 3, Vice President 2022
Brenda Wolff District 5 2022
Jeanette Dixon At Large 2020
Karla Silvestre At Large 2022
Judith Docca District 1 2022
Rebecca Smondrowski District 2 2020
Shebra Evans District 4, President 2020
Nick Asante At Large, Student Member 2021
Dr. Jack Smith Superintendent 2020

MCPS conducted its first 'data deletion week' in 2019, purging its databases of unnecessary student information. Parents said they hoped to shield children from being held accountable in adulthood for youthful mistakes, as well as to guard them from exploitation by what one parent termed "the student data surveillance industrial complex".The district also requires tech companies to annually delete data they collect on schoolchildren. In December 2019 it said GoGuardian had sent formal certification that it had deleted its data, but the district was still waiting for confirmation from Google.

Montgomery College

The county is also served by Montgomery College, a public, open access community college that has a budget of US$315 million for FY2020. The county has no public university of its own, but the state university system does operate a facility called Universities at Shady Grove in Rockville that provides access to baccalaureate and Master's level programs from several of the state's public universities.

Montgomery County Public Libraries

The Montgomery County Public Libraries (MCPL) system includes 23 individual libraries, and had a budget $38 million for 2015.

Images for kids

See also

Kids robot.svg In Spanish: Condado de Montgomery (Maryland) para niños

National Hispanic Heritage Month on Kiddle
Prominent Hispanic scientists
Severo Ochoa
Sarah Stewart
Mario J. Molina
Rodolfo Llinás
F. J. Duarte
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