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Welcome to
Adams County Colorado
History and Genealogy

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Adams County was created by the Colorado legislature on April 15, 1901 out of the northern portions of Arapahoe County. The eastern portions of the county were realigned to become part of Washington and Yuma counties on May 12, 1903. Following a 1989 vote, 53 square miles of the county was transferred to the City and County of Denver for the purpose of constructing Denver International Airport, leaving the western portion of the county as two oddly-shaped peninsulas. Adams lost additional territory in its northwest corner on November 15, 2001, when the City and County of Broomfield was created.

It is named for Alva Adams, a former Governor of Colorado. The county seat is Brighton; the largest city is Aurora.

Adams County Map
Adams County, Co

Cities and Towns
Arvada (partially)
Aurora (partially)
Bennett (partially)
Brighton (partially)
Commerce City
Thornton (partially)
Watkins (partially)
Westminster (partially)


Online Data


Church Histories / Records

County Records

Death Records

Family Bibles


Miscellaneous Data

School Records

Wills/Probate Records

Website Updates
Oct 2014: 
County History: Government:1909 County Officers

Previous Updates

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Adjacent Counties
The county is bounded in the north by
Weld County and Morgan County, in the east by Washington County, in the south by Arapahoe County and the City and County of Denver, and in the west by the City and County of Broomfield and Jefferson County. The county surrounds Denver International Airport.

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