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County profile
About Adams County
Adams County is a county located in the U.S. state of Colorado. As of the 2020 United States census, the population was 519,572. The county seat is Brighton, and the largest city is Thornton. The county is named for Alva Adams, an early Governor of the State of Colorado in 1887–1889. Adams County is part of the Denver metropolitan area.
Description adapted from Wikipedia, CC BY-SA 4.0.
At a glance
Adams County at a glance
- County seat
- Brighton
- Population
- 519,572 (2020)
- Land area
- 1,198 sq mi
- Founded
- 1901
Communities
Largest communities in Adams County
| Community | Population |
|---|---|
| Aurora | 386,261 |
| Thornton | 141,867 |
| Arvada | 124,402 |
| Westminster | 116,317 |
| Commerce City | 62,418 |
History
History of Adams County
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.
Adapted from Wikipedia, CC BY-SA 4.0.
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Official channels
Adams County election resources
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Neighbors
Neighboring counties
About
Part of Colorado Voter Check
This is the Adams County page of Colorado Voter Check, a project of True the Vote, pointing Colorado voters at the official tools that already exist — and at Scan Check Protect to verify your registration.
Where anything here differs from what Adams County or the Colorado Secretary of State publishes, they are right and this page is not.