Smithfield is a town in Somerset County, Maine, United States. The population was 925 at the 2020 census. The town was incorporated on February 29, 1840, making it the only town in Maine incorporated on Leap Day. The town was named after the Rev. Henry Smith, an early settler.

Somerset County is a county in the U.S. state of Maine, United States. As of the 2020 census, the population was 50,477. Its county seat is Skowhegan.