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Jefferson County, Colorado

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Jefferson County Courthouse from I-70 — CC BY-SA 2.0, Rick Kimpel from Spring, TX, USA · source

County profile

About Jefferson County

Jefferson County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 582,910, making it the fourth-most populous county in Colorado. The county seat is Golden, which was Colorado's capital twice, and its most populous city is Lakewood.

Description adapted from Wikipedia, CC BY-SA 4.0.

At a glance

Jefferson County at a glance

County seat
Golden
Population
582,910 (2020)
Land area
778 sq mi
Founded
1861

Communities

Largest communities in Jefferson County

CommunityPopulation
Lakewood155,984
Arvada124,402
Westminster116,317
Littleton45,652
Ken Caryl33,811

History

History of Jefferson County

On August 25, 1855, the Kansas Territorial Legislature created Arapahoe County to govern the entire western portion of the territory. The county was named for the Arapaho Nation of Native Americans who lived in the region. In June 1858, gold was discovered along the South Platte River in Arapahoe County (in present-day Englewood) by William Greeneberry Russell and Sam Bates who had been following up the June 22, 1850, discovery of gold on Ralston Creek in today's Jefferson County by Lewis Ralston, for whom the creek was named. This discovery precipitated the Pike's Peak Gold Rush.

Adapted from Wikipedia, CC BY-SA 4.0.

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  2. 2 · Ask Jefferson County directly

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Official channels

Jefferson County election resources

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Neighbors

Neighboring counties

About

Part of Colorado Voter Check

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