Arapahoe County was Colorado's first county as well as one of the largest with a population of more than 500,000. Arapahoe County was named for the Arapahoe Indians, who along with the Cheyenne Indians, occupied most of Colorado when it was still a territory.

Back then, Arapahoe County was much larger, stretching east to western Kansas. Denver was the original County seat until 1902 when the city split off and became a separate county. The City of Littleton became the new county seat and remains the county seat today.

Arapahoe County Website Assessor (303) 795-4600 Clerk & Recorder (303) 795-4200 City Council (303) 795-4630 Coroner (720) 874-3625 District Attorney (720) 874-8500 Back to Top Health and Environment 303-220-9200 Police Department (720) 874-3600 Public Works (720) 874-6500 Treasurer (303) 795-4550

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