Arapahoe County Government
Arapahoe County, Colorado
Welcome to Arapahoe County which has a rich, vibrant history and the distinction of being Colorado’s first county. Arapahoe County spans 805 square miles and is a land of contrast. The western part of the county is mostly urban with residential, retail, office and industrial areas, while the eastern portion is relatively rural, with a total population of 631,096 and unincorporated population of 83,764.