Eustis is a town in Franklin County, Maine, United States. The population was 641 at the 2020 census. Eustis, which includes the village of Stratton, is a popular recreation area.

Franklin County is a county located in the state of Maine, United States. As of the 2020 census, the population was 29,456, making it the second-least populous county in Maine. Its county seat is Farmington. The county was established on May 9, 1838, and named for Benjamin Franklin.