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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.
Population Trends: Population change for Plaistow totaled 4,699 over 54 years, from 2,915 in 1960 to 7,614 in 2014. The largest decennial percent change was a 62 percent increase between 1960 and 1970; the smallest, a seven percent increase between 1990 and 2000. The 2014 Census estimate for Plaistow was 7,614 residents, which ranked 39th among New Hampshire's incorporated cities and towns. Population Density and Land Area, 2014 (US Census Bureau): 717.6 persons per square mile of land area.