Castle Hill is a town in Aroostook County, Maine, United States.

There were 211 housing units at an average density of 5.9 per square mile (2.3/km2).

21.5% of all households were made up of individuals, and 6.1% had someone living alone who was 65 years of age or older.

There were 207 housing units at an average density of 5.8 per square mile (2.2/km2).

The racial makeup of the town was 96.92% White, 1.98% Native American, 0.22% Asian, and 0.88% from two or more races.

18.7% of all households were made up of individuals, and 5.5% had someone living alone who was 65 years of age or older.