High Quality Content by WIKIPEDIA articles! Acton is a town in York County, Maine, United States. The population was 2,447 at the 2010 census. It includes the villages of Acton, Miller Corner and South Acton. The town is home to the Acton Fairground, which holds the Acton Fair every late summer. It is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area.