Sun Prairie is a census-designated place (CDP) in Cascade County, Montana, United States.

[3] It is part of the Great Falls Metropolitan Statistical Area.

[4] As of the census[6] of 2000, there were 1,772 people, 626 households, and 503 families residing in the CDP.

There were 656 housing units at an average density of 110.1 per square mile (42.5/km2).

14.4% of all households were made up of individuals, and 2.7% had someone living alone who was 65 years of age or older.