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Shirley is a town in Piscataquis County, Maine, United States. The town was named after Shirley, Massachusetts. The population was 233 at the 2010 census.
The population was 6,284 at the 2010 census. The central settlement in town, with 3,103 people at the 2010 census, is defined as the Peterborough census-designated place (CDP) and is located along the Contoocook River at the junction of U.S. Route 202 and New Hampshire Route 101.