Northfield is a town in Washington County, Maine, United States.

There were 258 housing units at an average density of 5.9 per square mile (2.3/km2).

32.4% of all households were made up of individuals, and 9.5% had someone living alone who was 65 years of age or older.

36.1% of all households were made up of individuals, and 13.1% had someone living alone who was 65 years of age or older.

There were no families and 7.1% of the population living below the poverty line, including no under eighteens and 9.5% of those over 64.