Adams County, Colorado
|Adams County, Colorado|
Location in the state of Colorado
Colorado's location in the U.S.
|Founded||April 15, 1901|
|Named for||Alva Adams|
1,197.71 sq mi (3,102 km²)
1,191.93 sq mi (3,087 km²)
5.78 sq mi (15 km²), 0.48%
370.5/sq mi (143/km²)
Adams County is the fifth most populous of the 64 counties of the state of Colorado of the United States. The United States Census Bureau that the county population was 441,603 in 2010 census, a 21.4% increase since 2000 census. Adams County is named for Alva Adams, Governor of the State of Colorado 1887–1889, 1897–1899, and 1905. The county seat is Brighton. Adams County is part of the Denver-Aurora-Broomfield, CO Metropolitan Statistical Area and the Denver-Aurora-Boulder Combined Statistical Area.
On May 30, 1854, the Kansas-Nebraska Act created the Territory of Nebraska and Territory of Kansas, divided by the Parallel 40° North (168th Avenue in present-day Adams County). The future Adams County, Colorado, occupied a strip of northern Arapahoe County, Kansas Territory, immediately south of the Nebraska Territory.
In 1859, John D. "Colonel Jack" Henderson built a ranch, trading post, and hotel on Henderson Island in the South Platte River in Arapahoe County, Kansas Territory. Jack Henderson was the former editor and proprietor of the Leavenworth (Kansas Territory) Journal and an outspoken pro-slavery politician who had been accused of vote fraud in eastern Kansas. Henderson sold meat and provisions to gold seekers on their way up the South Platte River Trail to the gold fields during the Pike's Peak Gold Rush. Henderson Island was the first permanent settlement in the South Platte River Valley between Fort Saint Vrain in the Nebraska Territory and the Cherry Creek Diggings in the Kansas Territory. Jack Henderson eventually returned to eastern Kansas and (ironically) fought for the Union in the American Civil War. Henderson Island is today the site of the Adams County Regional Park and Fairgrounds.
The eastern portion of the Kansas Territory was admitted to the Union as the State of Kansas on January 29, 1861, and on February 28, 1861, the remaining western portion of the territory was made part of the new Colorado Territory. The Colorado Territory created Arapahoe County, on November 1, 1861, and Colorado was admitted to the Union on August 1, 1876.
In 1901, the Colorado General Assembly voted to split Arapahoe County into three parts: a new Adams County, a new consolidated City and County of Denver, 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 creation of Adams County until November 15, 1902. Governor James Bradley Orman designated Brighton as the temporary Adams County Seat. Adams County originally stretched 160 miles (258 kilometers) from present-day Sheridan Boulevard to the Kansas state border. On May 12, 1903, the eastern 88 miles (142 kilometers) of Adams County was transferred to the new Washington County and the new Yuma County, reducing the length of Adams County to the present 72 miles (116 kilometers). On November 8, 1904, Adams County voters chose Brighton as the permanent county seat.
A 1989 vote transferred 53 square miles (137 square kilometers) of Adams County to the City and County of Denver for the proposed Denver International Airport, leaving the densely populated western portion of the county as two oddly-shaped peninsulas. Adams County lost the tip of its northwest corner when the consolidated City and County of Broomfield was created on November 15, 2001.
According to the 2000 census, the county has a total area of 1,197.71 square miles (3,102.1 km2), of which 1,191.93 square miles (3,087.1 km2) (or 99.52%) is land and 5.78 square miles (15.0 km2) (or 0.48%) is water.
Adjacent counties 
- Weld County – north
- Morgan County – northeast
- Washington County – east
- Arapahoe County – south
- City & County of Denver – south
- Jefferson County – west
- City & County of Broomfield – northwest
As of the census of 2000, there were 363,857 people, 128,156 households, and 92,144 families residing in the county. The population density was 305 people per square mile (118/km²). There were 132,594 housing units at an average density of 111 per square mile (43/km²). The racial makeup of the county was 77.29% White, 2.97% Black or African American, 1.19% Native American, 3.21% Asian, 0.12% Pacific Islander, 11.73% from other races, and 3.49% from two or more races. 28.19% of the population were Hispanic or Latino of any race.
There were 128,156 households out of which 37.80% had children under the age of 18 living with them, 53.80% were married couples living together, 12.10% had a female householder with no husband present, and 28.10% were non-families. 21.20% of all households were made up of individuals and 5.50% had someone living alone who was 65 years of age or older. The average household size was 2.81 and the average family size was 3.27.
In the county the population was spread out with 28.60% under the age of 18, 10.30% from 18 to 24, 34.00% from 25 to 44, 19.40% from 45 to 64, and 7.80% who were 65 years of age or older. The median age was 31 years. For every 100 females there were 102.80 males. For every 100 females age 18 and over, there were 102.10 males.
The median income for a household in the county was $47,323, and the median income for a family was $52,517. Males had a median income of $36,499 versus $28,053 for females. The per capita income for the county was $19,944. About 6.50% of families and 8.90% of the population were below the poverty line, including 10.90% of those under age 18 and 7.30% of those age 65 or over.
In 2000, the largest denominational groups were Catholics (with 60,429 members) and Evangelical Protestants (with 25,552 members). The largest religious bodies were The Catholic Church (with 60,429 adherents)and The Church of Jesus Christ of Latter-day Saints (with 6,808 adherents).
Cities and town 
Seven cities and one town (Bennett) have been established in the county. Portions of most of these municipalities lie in adjacent counties as well:
- Arvada (partially)
- Aurora (partially)
- Bennett (partially)
- Brighton (mostly)
- Commerce City
- Federal Heights
- Northglenn (mostly)
- Strasburg (partially)
- Thornton (mostly)
- Westminster (partially)
Unincorporated communities 
Census-designated places 
The school districts serving Adams County are:
- Adams 12 Five Star Schools
- Adams County 14
- Bennett 29J
- Brighton 27J
- Mapleton 1
- Strasburg 31J
- Westminster 50.
Community development organizations 
National wildlife refuge 
State park 
Historic trail 
Recreational trails 
- American Discovery Trail
- Big Dry Creek National Recreation Trail
- Highline Canal National Recreation Trail
- Platte River Greenway National Recreation Trail
- Rocky Mountain Arsenal National Recreation Trail
License plate code 
See also 
- Outline of Colorado
- Index of Colorado-related articles
- Colorado census statistical areas
- Colorado counties
- Colorado metropolitan areas
- Colorado municipalities
- Denver-Aurora Metropolitan Statistical Area
- Denver-Aurora-Boulder Combined Statistical Area
- Front Range Urban Corridor
- Historic Colorado counties
- National Register of Historic Places listings in Adams County, Colorado
- Gannett, Henry (1905). The Origin of Certain Place Names in the United States. p. 23.
- United States Census Bureau. "2010 Census Data". United States Census Bureau. Retrieved February 5, 2012.
- "State Government History". State of Colorado, Department of Personnel & Administration, Colorado State Archives. April 18, 2001. Archived from the original on November 30, 2006. Retrieved November 28, 2006.
- "Census 2000 U.S. Gazetteer Files: Counties". United States Census. Retrieved February 13, 2011.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- "County Membership Reports". thearda.com. Archived from the original on July 12, 2011. Retrieved August 22, 2011.
- Education, Colorado Department of. "Index of Counties and School Districts". Colorado Department of Education. Archived from the original on December 29, 2009. Retrieved December 20, 2009.
- Adams County Government website
- Biography of John D. Henderson
- Colorado County Evolution by Don Stanwyck
- Colorado Historical Society
||City and County of Broomfield||Weld County||Morgan County|
|Jefferson County||Washington County|
|Arapahoe County and City and County of Denver|