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Summit County, Colorado

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Summit County court house in Colorado — CC BY 3.0, David Shankbone · source

County profile

About Summit County

Summit County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 31,055, and was estimated to be 30,882 in 2024. The county seat is Breckenridge. Summit County comprises the Breckenridge, CO Micropolitan Statistical Area.

Description adapted from Wikipedia, CC BY-SA 4.0.

At a glance

Summit County at a glance

County seat
Breckenridge
Population
31,055 (2020)
Land area
619 sq mi
Founded
1861

Communities

Largest communities in Summit County

CommunityPopulation
Breckenridge County seat5,078
Silverthorne4,402
Frisco2,913
Keystone1,369
Dillon1,064

History

History of Summit County

Summit County was organized as one of the seventeen original Colorado counties by the First Territorial Legislature on November 1, 1861. It was named for the many mountain summits in the county. Until February 2, 1874, its boundaries included the area now comprising Summit County, Grand County, Routt County, Moffat County, Garfield County, Eagle County, and Rio Blanco County. In 1874, the northern half of the original Summit County was split off to form Grand County; with the creation of Garfield and Eagle counties in 1883, Summit County arrived at its present boundaries. In addition, Summit County has seen two major boom eras.

Adapted from Wikipedia, CC BY-SA 4.0.

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  2. 2 · Ask Summit County directly

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Official channels

Summit County election resources

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Neighbors

Neighboring counties

About

Part of Colorado Voter Check

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