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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 United States Census Bureau estimates that the population of New Hampshire was 1,330,608 on July 1, 2015, a 1.07% increase since the 2010 United States Census. The center of population of New Hampshire is located in Merrimack County, in the town of Pembroke.