Ridgefield is a town in Fairfield County, Connecticut, United States. Situated in the foothills of the Berkshire Mountains, the 300-year-old community had a population of 25,033 at the 2020 census. The town is part of the Western Connecticut Planning Region. The town center, which was formerly a borough, is defined by the U.S. Census Bureau as a census-designated place. Ridgefield was first settled by English colonists from Norwalk and Milford in 1708, when a group of settlers purchased land from Chief Catoonah of the Ramapo tribe. The town was incorporated under a royal charter from the Connecticut General Assembly issued in 1709. Ridgefield was descriptively named. The most notable 18th-century event was the Battle of Ridgefield on April 27, 1777.