Arapahoe is a census-designated place (CDP) in Cheyenne County, Colorado, United States.

[3] The Arapahoe, Colorado, post office opened on May 5, 1906.

[7] The Arapahoe post office has the ZIP code 80802.

[6] The town name honors the Arapaho Native American people who lived in the area.

At the 2020 United States Census, the CDP has an area of 177 acres (0.718 km2), all land.