Mercer is a town in Somerset County, Maine, United States.

The town was named after the Revolutionary War hero Hugh Mercer.

There were 399 housing units at an average density of 14.9 per square mile (5.8/km2).

24.0% of all households were made up of individuals, and 8.3% had someone living alone who was 65 years of age or older.

There were 366 housing units at an average density of 13.7 per square mile (5.3/km2).

19.9% of all households were made up of individuals, and 9.0% had someone living alone who was 65 years of age or older.