Waltham is a town in Hancock County, Maine, United States.

There were 206 housing units at an average density of 6.9 per square mile (2.7/km2).

22.7% of all households were made up of individuals, and 8% had someone living alone who was 65 years of age or older.

There were 176 housing units at an average density of 5.9 per square mile (2.3/km2).

15.3% of all households were made up of individuals, and 5.4% had someone living alone who was 65 years of age or older.

About 15.1% of families and 13.9% of the population were below the poverty line, including 12.8% of those under the age of eighteen and 14.3% of those 65 or over.