[5] Arapahoe is located in central Fremont County at 42°58′48″N 108°26′44″W / 42.98000°N 108.44556°W / 42.98000; -108.44556 (42.979965, -108.445510),[6] in the southeastern part of the Wind River Indian Reservation.

[7] As of the census[3] of 2000, there were 1,766 people, 440 households, and 371 families residing in the CDP.

13.9% of all households were made up of individuals, and 5.7% had someone living alone who was 65 years of age or older.

The majority of Arapahoe is served by Fremont County School District #38.

A small portion of the CDP is located within the boundaries of Fremont County School District #25.