Sister Bay is a village in Door County, Wisconsin, United States.

[6] At the 2000 census,[4] there were 886 people, 446 households and 224 families living in the village.

There were 945 housing units at an average density of 364.7 per square mile (140.9/km2).

46.4% of all households were made up of individuals, and 28.7% had someone living alone who was 65 years of age or older.

There were 1,335 housing units at an average density of 517.4 per square mile (199.8/km2).

47.3% of all households were made up of individuals, and 29.7% had someone living alone who was 65 years of age or older.