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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.
As a result of that fluctuation, the population of Maine in 2016 is a little hard to pinpoint, but current estimates show there are now 1,329,328 people living in the state, a slight rise from the last Census. Maine currently has one of the slowest population growth rates in the country of only 0.03%, which ranks 48th out of 50.