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Cobb County, Georgia
Seal of Cobb County, Georgia
Map of Georgia highlighting Cobb County
Location in the state of Georgia
Map of the USA highlighting Georgia
Georgia's location in the U.S.
Founded December 2, 1832
Seat Marietta
Largest City Marietta
 - Total
 - Land
 - Water

345 sq mi (894 km²)
340 sq mi (881 km²)
5.0 sq mi (13 km²), 1.4%
 -  Density

2,026/sq mi (782/km²)
Time zone Eastern: UTC-5/-4
Named for: Thomas W. Cobb

Cobb County is a suburban county in the U.S. state of Georgia. As of the 2015, the population was 741,334, making it Georgia's third-most populous county. Its county seat and largest city is Marietta.

Cobb, along with several adjoining counties, was created on December 3, 1832, by the Georgia General Assembly from the huge Cherokee "county" territory—land northwest of the Chattahoochee River which the state confiscated from the Cherokee Nation and redistributed to settlers via lottery, following the passage of the federal Indian Removal Act. The county was named for Thomas Willis Cobb, a United States representative and senator from Georgia. It is believed Marietta was named for his wife, Mary.

Cobb County is included in the Atlanta-Sandy Springs-Roswell, GA Metropolitan Statistical Area. It is situated immediately to the northwest of Atlanta's city limits.

Its Cumberland District, an edge city, has over 24,000,000 square feet (2,200,000 m2) of office space.

The U.S. Census Bureau ranks Cobb County as the most-educated in the state of Georgia and 12th among all counties in the United States. It has ranked among the top 100 wealthiest counties in the United States.


Cobb County was one of nine Georgia counties carved out of the disputed territory of the Cherokee Nation in 1832. It was the 81st county in Georgia and named for Judge Thomas Willis Cobb, who served as a U.S. Senator, state congressman and Superior Court Judge. It is believed that the county seat of Marietta was named for Judge Cobb's wife, Mary. The state started acquiring right-of-way for a railroad in 1836. A train began running between Marietta and Marthasville (now Atlanta) in 1845. Before the Civil War, Marietta was a summer resort for residents of Savannah and Charleston fleeing Yellow Fever.

Battle of Kenesaw Mountian
Painting of the Battle of Kennesaw Mountain

During the American Civil War, some confederate troops were trained at a camp in Kennesaw. There were battles of New Hope Church May 25, Pickett's Mill May 27, and Dallas May 28. The Battle of Allatoona Pass on October 28 occurred as Sherman was starting his March through Georgia. Union forces burnt most houses and confiscated or burnt crops. The Battle of Kennesaw Mountain June 27, 1864, was the site of the only major Confederate victory in General William T. Sherman's invasion of Georgia. Despite the victory, Union forces outflanked the Confederates.

In 1915, Leo Frank, the Jewish supervisor of an Atlanta pencil factory who was convicted of murdering one of his workers, thirteen-year-old Mary Phagan, was kidnapped from his jail cell and brought to Frey's Gin, two miles (3 km) east of Marietta, where he was lynched.

Cotton farming in the area peaked from the 1890s through the 1920s. Low prices during the Great Depression resulted in the cessation of cotton farming throughout Cobb County. The price of Cotton went from 16 cents a pound in 1920 to 9.5 cents in 1930. This resulted in a Cotton Bust for the county, which had stopped growing the product but was milling it. This bust was in turn, followed by the Great Depression. To help combat the bust, the state started work on a road in 1922 that would later become US 41.

128th Fighter Squadron F-47 Thunderbolt Marietta GA May 1946
F-47 Thunderbolt - 128th Fighter Squadron - Marietta Army Airfield, 1946

In 1942, Bell Aircraft opened a Marietta plant to manufacture B-29 bombers and Marietta Army Airfield was founded. Both were closed after World War II, but reopened during the Korean War, when the air field was acquired by the Air Force, renamed Dobbins AFB, and the plant by Lockheed. During the Korean and Vietnam Wars, Lockheed Marietta was the leading manufacturer of military transport planes, including the C-130 Hercules and the C-5 Galaxy. "In Cobb County and other sprawling Cold War suburbs from Orange County to Norfolk/Hampton Roads, the direct link between federal defense spending and local economic prosperity structured a bipartisan political culture of hawkish conservatism and material self-interest on issues of national security."

Kennesaw State Spaceship Earth and Social Science
Kennesaw State University

When home rule was enacted statewide by amendment to the Georgia state constitution in the early 1960s, Ernest W. Barrett became the first chairman of the new county commission. The county courthouse, built in 1888, was demolished.

In the 1960s and 1970s, Cobb transformed from rural to suburban, as integration spurred white flight from the city of Atlanta, which by 1970 was majority-African-American. Real estate booms drew rural white southerners and Rustbelt transplants, both groups mostly first-generation white-collar. Cobb County was the home of former segregationist and Georgia governor Lester Maddox (1966–71). In 1975, Cobb voters elected John Birch Society leader Larry McDonald to Congress, running in opposition to desegregation busing. A conservative Democrat, McDonald called for investigations into alleged plots by the Rockefellers and the Soviet Union to impose "socialist-one-world-government" and co-founded the Western Goals Foundation. In 1983, McDonald died aboard Korean Air Lines Flight 007, shot down by a Soviet fighter over restricted airspace.

Glover Park Bell
Glover Park Bell, on the square in Marietta

In 1990, Republican Congressmen Newt Gingrich became Representative of a new district centered around Cobb County. In 1994, as Republicans took control of the House of Representatives for the first time in almost fifty years, Gingrich became Speaker of the House, thrusting Cobb County into the national spotlight. In 1993, county commissioners passed a resolution condemning homosexuality and cut off funding for the arts after complaints about a community theater. After protests from gay rights organizations, organizers of the 1996 Summer Olympics pulled events out of Cobb County. The county's inns were nevertheless filled at 100% of capacity for two months during the event.

In the 1990s and 2000s, Cobb's demographics changed. As Atlanta's gentrification reversed decades of white flight, middle-class African-Americans and Russian, Bosnian, Chinese, Indian, Brazilian, Mexican and Central American immigrants moved to older suburbs in South and West Cobb. In 2010, African-American Democrat David Scott was elected to Georgia's 13th congressional district, which included many of those suburbs. Cobb became the first Georgia county to participate in the Immigration and Nationality Act Section 287(g) enabling local law officers to enforce immigration law.


Union Trenches at Kennesaw Mountain, 1864
East Palisades
Chattahoochee River National Recreation Area

According to the U.S. Census Bureau, the county has a total area of 345 square miles (890 km2), of which 340 square miles (880 km2) is land and 4.0 square miles (10 km2) (1.4%) is water.

The county is divided between two major basins. Most runoff flows into the Middle Chattahoochee-Lake Harding and Upper Chattahoochee River sub-basins of the ACF River Basin (Apalachicola-Chattahoochee-Flint River Basin) along the southeastern border, directly via Willeo Creek, Sope Creek (Sewell Creek), Rottenwood Creek (Powers Creek, Poorhouse Creek, Poplar Creek), Nickajack Creek and others.

There are several high points in Cobb County.

  • Sweat Mountain: in the extreme northeast portion, runs along the border with Cherokee County, and is the metro area's major antenna farm
  • Blackjack Mountain: a low ridge between central and east Cobb
  • Kennesaw Mountain: the highest point in the county and in the entire suburban area of metro Atlanta, located in the north-northwest between Kennesaw and Marietta
  • Little Kennesaw Mountain: an offshoot of Kennesaw
  • Lost Mountain: in western Cobb
  • Pine Mountain: west-northwest of Kennesaw Mountain, between Kennesaw and Due West
  • Brushy Mountain: near Kennesaw Mountain, just southeast of Barrett Parkway at Cobb Parkway
  • Vinings Mountain or Mount Wilkinson: overlooks the town of Vinings

Adjacent counties


Despite the lack of a grid system of city blocks though the county, all street addresses have their numeric origin at the southwest corner of the town square in Marietta.

Geocodes and world's largest toll-free calling area

Originally in area code 404, the county was moved into area code 770 in 1995, and overlaid by area code 678 in 1998. Prior to 1995, those with phones tied to the Woodstock telephone exchange (prefixes 924, 926, 928, later 516 and 591) could also call the Canton exchange (479, later 445, then 704) as a local call. This became moot, along with other dual-zone exchanges in metro Atlanta, when the exurban exchanges (including Canton) were fully made a part of what was already the world's largest toll-free calling zone. It is a zone spanning 7,162 square miles (18,549 km2), with four active telephone area codes, and local calling extending into portions of two others.

Cobb's FIPS county code is 13067. Because the National Weather Service has not subdivided the county, its WRSAME code is 013067, for receiving targeted weather warnings from NOAA Weather Radio. The county is primarily within the broadcast range of one weather radio station: KEC80, on 162.550 MHz, transmitted to all of metro Atlanta and broadcast from NWSFO Peachtree City. The secondary station is the much newer WWH23 on 162.425 from Buchanan, which also transmits warnings for Cobb but has reception mainly in the western part of the county.


Historical population
Census Pop.
1840 7,539
1850 13,843 83.6%
1860 14,242 2.9%
1870 13,814 −3.0%
1880 20,748 50.2%
1890 22,286 7.4%
1900 24,664 10.7%
1910 28,397 15.1%
1920 30,437 7.2%
1930 35,408 16.3%
1940 38,272 8.1%
1950 61,830 61.6%
1960 114,174 84.7%
1970 196,793 72.4%
1980 297,718 51.3%
1990 447,745 50.4%
2000 607,751 35.7%
2010 688,078 13.2%
Est. 2015 741,334 7.7%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2013

2000 census

As of 2011, there were 697,553 people, 248,303 households, and 169,178 families residing in the county. The population density was 1,998 people per square mile (763/km²). There were 261,659 housing units at an average density of 770 per square mile (301/km²). The racial makeup of the county in 2010 62.2% White, 25.0% Black, 0.3% Native American, 4.5% Asian, 0.0% Pacific Islander, 5.3% from other races, and 2.7% from two or more races. 14.3% of the population was Hispanic or Latino of any race.

There were 248,303 households out of which 35.80% had children under the age of 18 living with them, 54.30% were married couples living together, 10.70% had a female householder with no husband present, and 31.20% were non-families. 23.20% of all households were made up of individuals and 4.10% had someone living alone who was 65 years of age or older. The average household size was 2.71 and the average family size was 3.25.

In the county, the population was spread out with 26.10% under the age of 18, 9.00% from 18 to 24, 36.50% from 25 to 44, 21.50% from 45 to 64, and 6.90% who were 65 years of age or older. The median age was 33 years. For every 100 females there were 98.50 males. For every 100 females age 18 and over, there were 95.90 males.

As of 2007, the median income was $70,472. The per capita income for the county was $32,740. About 6.0% of families and 9.4% of the population were below the poverty line, including 9.1% of those under age 18 and 7.8% of those age 65 or over.

2010 census

As of the 2010 United States Census, there were 688,078 people, 260,056 households, and 175,357 families residing in the county. The population density was 2,026.4 inhabitants per square mile (782.4/km2). There were 286,490 housing units at an average density of 843.7 per square mile (325.8/km2). The racial makeup of the county was 62.2% white, 25.0% black or African American, 4.5% Asian, 0.3% American Indian, 0.1% Pacific islander, 5.3% from other races, and 2.7% from two or more races. Those of Hispanic or Latino origin made up 12.3% of the population. In terms of ancestry, 10.4% were German, 10.0% were English, 9.3% were Irish, and 8.6% were American.

Of the 260,056 households, 36.7% had children under the age of 18 living with them, 50.2% were married couples living together, 13.0% had a female householder with no husband present, 32.6% were non-families, and 25.6% of all households were made up of individuals. The average household size was 2.61 and the average family size was 3.17. The median age was 35.4 years.

The median income for a household in the county was $65,522 and the median income for a family was $78,920. Males had a median income of $55,200 versus $43,367 for females. The per capita income for the county was $33,110. About 7.6% of families and 10.6% of the population were below the poverty line, including 14.5% of those under age 18 and 7.2% of those age 65 or over.

Diplomatic missions

The Consulate-General of Costa Rica in Atlanta is located in Suite 100 at 1870 The Exchange in an unincorporated section of Cobb County.


Kennesaw Mountian Cannon
Kennesaw Mountain National Battlefield Park

Major highways

  • I-20.svg Interstate 20
  • I-75.svg Interstate 75
  • I-285.svg Interstate 285
  • I-575.svg Interstate 575
  • US 41.svg U.S. Route 41
  • US 78.svg U.S. Route 78
  • US 278.svg U.S. Route 278
  • Georgia 3.svg State Route 3
  • Georgia 5.svg State Route 5
  • Georgia 5 Connector.svg State Route 5 Connector
  • Georgia 6.svg State Route 6
  • Georgia 6 Business.svg State Route 6 Business
  • Georgia 6 Spur.svg State Route 6 Spur
  • Georgia 8.svg State Route 8
  • Georgia 92.svg State Route 92
  • Georgia 120.svg State Route 120
  • Georgia 120 Loop.svg State Route 120 Alternate
  • Georgia 139.svg State Route 139
  • Georgia 280.svg State Route 280
  • Georgia 360.svg State Route 360
  • Georgia 401.svg State Route 401 (unsigned designation for I-75)
  • Georgia 402.svg State Route 402 (unsigned designation for I-20)
  • Georgia 407.svg State Route 407 (unsigned designation for I-285)
  • Georgia 417.svg State Route 417 (unsigned designation for I-575)


  • Cobb County Airport at McCollum Field
  • Dobbins Air Reserve Base (where the U.S. President usually arrives when visiting Atlanta)


  • Norfolk Southern through Mableton, Austell railyard, Powder Springs
  • CSX Transportation through Acworth, Kennesaw, Marietta, Smyrna, and Vinings
  • Georgia Northeastern Railroad spur line north from Marietta

Mass transit

  • Xpress GA / RTA commuter buses and Cobb Community Transit (CCT) Marietta/Cobb Counties Transit System serve the county.


Sope Creek pulp mill retaining wall ruin
Sope Creek Ruins
Silver Comet Trail and bike path
  • American Adventures (Marietta)
  • Chattahoochee River National Recreation Area
  • Kennesaw Mountain National Battlefield Park (Kennesaw to Marietta)
  • Lake Acworth/Acworth Beach(Acworth)
  • Lake Allatoona (near Acworth)
  • Mable House (Mableton)
  • Marietta Confederate Cemetery (Marietta)
  • Marietta Museum of History (Marietta)
  • Marietta/Cobb Museum of Art (Marietta)
  • Marietta National Cemetery (Marietta)
  • Silver Comet Trail (Smyrna, Mableton, Powder Springs)
  • Six Flags Over Georgia (Unincorporated Cobb)
  • Six Flags White Water (Marietta)
  • Southern Museum of Civil War and Locomotive History (Kennesaw)
  • Sun Valley Beach (near Powder Springs)


  • Cobb County Civic Center
  • Cobb Energy Performing Arts Center
  • Mable House Amphitheater
  • SunTrust Park


Cobb County landmark and reference point "The Big Chicken"
Historic Downtown Marietta


Census-designated places

Unincorporated communities

Sister county

Images for kids

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