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.