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Douglas County, Colorado

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Second Douglas County, CO, county building IMG 5196 — CC BY-SA 3.0, Billy Hathorn · source

County profile

About Douglas County

Douglas County is a county located in the U.S. state of Colorado. As of the 2020 Census, the population was 357,978. The county is named in honor of U.S. Senator Stephen A. Douglas. The county seat is Castle Rock.

Description adapted from Wikipedia, CC BY-SA 4.0.

At a glance

Douglas County at a glance

County seat
Castle Rock
Population
357,978 (2020)
Land area
843 sq mi
Founded
1861

Communities

Largest communities in Douglas County

CommunityPopulation
Aurora386,261
Highlands Ranch103,444
Castle Rock County seat73,158
Parker58,512
Littleton45,652

History

History of Douglas County

Douglas County was one of the original 17 counties created in the Colorado Territory by the Colorado Territorial Legislature on November 1, 1861. The county was named in honor of U.S. Senator Stephen A. Douglas of Illinois, who died five months before the county was created. The county seat was originally Franktown, but was moved to California Ranch in 1863, and then to Castle Rock in 1874. Although the county's boundaries originally extended eastward to the Kansas state border, in 1874, most of the eastern portion of the county became part of Elbert County.

Adapted from Wikipedia, CC BY-SA 4.0.

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Official channels

Douglas County election resources

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Neighbors

Neighboring counties

About

Part of Colorado Voter Check

This is the Douglas 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 Douglas County or the Colorado Secretary of State publishes, they are right and this page is not.