Arapahoe County, Colorado facts for kids

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Arapahoe County, Colorado
Map
Map of Colorado highlighting Arapahoe County
Location in the state of Colorado
Map of the USA highlighting Colorado
Colorado's location in the U.S.
Statistics
Founded November 1, 1861
Seat Littleton
Largest City Aurora
Area
 - Total
 - Land
 - Water

805 sq mi (2,085 km²)
798 sq mi (2,067 km²)
7.3 sq mi (19 km²), 0.9%
PopulationEst.
 - (2015)
 - Density

631,096
606/sq mi (234/km²)
Time zone Mountain: UTC-7/-6
Website: www.co.arapahoe.co.us
Named for: The Arapaho Nation
Third most populous Colorado county

Arapahoe County (/əˈræpəh/ ə-RAP-ə-ho) is one of the 64 counties in the U.S. state of Colorado. As of the 2010 census, the population was 572,003, making it the third-most populous county in Colorado. The county seat is Littleton, and the most populous city is Aurora. The county was named for the Arapaho Native American tribe who once lived in the region.

Arapahoe County is part of the Denver-Aurora-Lakewood, CO Metropolitan Statistical Area. Arapahoe County calls itself "Colorado's First County" since its origins predate the Pike's Peak Gold Rush.

History

On August 25, 1855, the Kansas Territorial Legislature created a huge Arapahoe County to govern the entire western portion of the Territory of Kansas. The county was named for the Arapaho Nation who lived in the region.

In July 1858, gold was discovered along the South Platte River in Arapahoe County (in present-day Englewood). This discovery precipitated the Pike's Peak Gold Rush. Many residents of the mining region felt disconnected from the remote territorial governments of Kansas and Nebraska, so they voted to form their own Territory of Jefferson on October 24, 1859. The following month, the Jefferson Territorial Legislature organized 12 counties for the new territory, including a smaller Arrappahoe County. Denver City served as the county seat of Arapahoe County.

The Jefferson Territory never received federal sanction, and when the State of Kansas was admitted to the Union on January 29, 1861, the mining regions temporarily reverted to unorganized territory. On February 28, 1861, Congress passed an act organizing the Territory of Colorado, using present-day borders. On November 1, 1861, the Colorado Territorial Assembly organized the 17 original counties of Colorado, including a new Arapahoe County. Arapahoe County originally stretched from the line of present-day Sheridan Boulevard 160 miles (258 kilometers) east to the Kansas border, and from the line of present-day County Line Road 30 miles (48 kilometers) north to the Parallel 40° North (168th Avenue). Denver City served as the county seat of Arapahoe County until 1902.

In 1901, the Colorado General Assembly voted to split Arapahoe County into three parts: a new consolidated City and County of Denver, a new Adams County, and the remainder of the Arapahoe County to be renamed South Arapahoe County. A ruling by the Colorado Supreme Court, subsequent legislation, and a referendum delayed the reorganization until November 15, 1902. Governor James Bradley Orman designated Littleton as the temporary county seat of South Arapahoe County. On April 11, 1903, the Colorado General Assembly changed the name of South Arapahoe County back to Arapahoe County. On November 8, 1904, Arapahoe County voters chose Littleton over Englewood by a vote of 1310 to 829 to be the permanent county seat.

Geography

Arapahoe County Justice Center
The contemporary Arapahoe County Courthouse in Dove Valley.

According to the U.S. Census Bureau, the county has a total area of 805 square miles (2,080 km2), of which 798 square miles (2,070 km2) is land and 7.3 square miles (19 km2) (0.9%) is water. The county measures 72 miles (116 kilometers) east to west and 4 to 12 miles (6 to 19 kilometers) south to north.

Two exclaves of Arapahoe County are entirely surrounded by the City and County of Denver, the City of Glendale and the Holly Hills neighborhood, a census-designated place.

Adjacent counties

Major highways

  • Interstate 25
  • Interstate 70
  • Interstate 225
  • E-470 (tollway)

State park

  • Cherry Creek State Park

Historic trails

  • Smoky Hill Trail
  • South Platte Trail

Recreation trails

  • Highline Canal National Recreation Trail
  • Platte River Greenway National Recreation Trail

Demographics

Historical population
Census Pop.
1870 6,829
1880 38,644 465.9%
1890 132,135 241.9%
1900 153,017 15.8%
1910 10,263 −93.3%
1920 13,766 34.1%
1930 22,647 64.5%
1940 32,150 42.0%
1950 52,125 62.1%
1960 113,426 117.6%
1970 162,142 42.9%
1980 293,621 81.1%
1990 391,511 33.3%
2000 487,967 24.6%
2010 572,003 17.2%
Est. 2015 631,096 10.3%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2015

As of the census of 2000, there were 487,967 people, 190,909 households, and 125,809 families residing in the county. The population density was 608 people per square mile (235/km²). There were 196,835 housing units at an average density of 245 per square mile (95/km²). The racial makeup of the county was 79.93% White, 7.67% Black or African American, 0.66% Native American, 3.95% Asian, 0.12% Pacific Islander, 4.51% from other races, and 3.16% from two or more races. 11.81% of the population were Hispanic or Latino of any race.

There were 190,909 households out of which 34.90% had children under the age of 18 living with them, 51.20% were married couples living together, 10.60% had a female householder with no husband present, and 34.10% were non-families. 27.00% of all households were made up of individuals and 5.90% had someone living alone who was 65 years of age or older. The average household size was 2.53 and the average family size was 3.11.

In the county, the population was spread out with 26.70% under the age of 18, 8.60% from 18 to 24, 33.10% from 25 to 44, 23.00% from 45 to 64, and 8.60% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 97.10 males. For every 100 females age 18 and over, there were 94.20 males.

The median income for a household in the county was $53,570, and the median income for a family was $63,875. Males had a median income of $41,601 versus $31,612 for females. The per capita income for the county was $28,147. About 4.20% of families and 5.80% of the population were below the poverty line, including 7.00% of those under age 18 and 5.10% of those age 65 or over.

Politics

Arapahoe County was once a Republican stronghold, and a classic bastion of suburban conservatism. However, the margin gradually declined in the 1990s and early 2000s, reflecting the county's growing and more diverse population. In 2008, the county swung over dramatically to support Barack Obama, who became the first Democrat to carry it since 1964, and only the second since 1944. Four years earlier, George W. Bush had won the county by four points; in 2008, Obama won it by 13 points. It voted for Obama by a similar margin in 2012, and provided much of Hillary Clinton's statewide margin in 2016.

Presidential election results
Year Republican Democrat
2016 38.66% 116,711 52.73% 159,171
2012 43.99% 125,588 53.90% 153,905
2008 42.78% 113,868 55.69% 148,224
2004 51.42% 119,475 47.45% 110,262
2000 51.47% 97,768 43.49% 82,614
1996 50.78% 82,778 41.90% 68,306
1992 39.26% 72,221 36.21% 66,607
1988 60.23% 95,926 38.37% 61,113
1984 71.91% 107,556 26.67% 39,891
1980 62.19% 79,594 23.55% 30,148
1976 63.45% 63,154 33.84% 33,685
1972 72.23% 52,283 25.74% 18,631
1968 59.64% 33,712 32.85% 18,569
1964 44.92% 23,071 54.40% 27,940
1960 60.06% 26,379 39.62% 17,400

Communities

Cities

Towns

Census-designated places

Unincorporated communities


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