Rainy Lake is an unorganized territory in Koochiching County, Minnesota, United States.
As of the census[1] of 2000, there were 4,469 people, 1,774 households, and 1,332 families residing in the unorganized territory.
There were 2,248 housing units at an average density of 6.4 per square mile (2.5/km2).
The racial makeup of the unorganized territory was 97.67% White, 0.16% Black or African American, 0.87% Native American, 0.20% Asian, 0.11% from other races, and 0.98% from two or more races.
20.9% of all households were made up of individuals, and 7.4% had someone living alone who was 65 years of age or older.