Fort Riley is part of the Manhattan, Kansas Metropolitan Statistical Area.
As of the census[4] of 2000, there were 8,114 people, 1,305 households, and 1,277 families residing in the CDP.
The racial makeup of the CDP was 60.0% White, 24.6% African American, 1.2% Native American, 2.1% Asian, 0.6% Pacific Islander, 6.3% from other races, and 5.2% from two or more races.
1.9% of all households were made up of individuals, and 0.3% had someone living alone who was 65 years of age or older.
The community is served by Geary County USD 475 public school district.