Pittsfield is a city in and the county seat of Pike County, Illinois, United States. The population was 4,576 at the 2010 census, an increase from 4,211 in 2000. Pittsfield was initially settled by settlers from New England. These settlers were of old Yankee stock, descended from the English Puritans who had founded and settled New England in the 1600s. A group of settlers from Pittsfield, Massachusetts headed west and settled this region of Illinois in 1820. When they arrived the area was a virgin wilderness, they constructed farms, roads and government buildings.
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