Pleasant Plains is a village in Sangamon County, Illinois, United States. The population was 802 at the 2010 census. It is part of the Springfield, Illinois Metropolitan Statistical Area. The village was incorporated April 8, 1876

Sangamon County is a county located in the center of the U.S. state of Illinois. According to the 2020 census, it had a population of 196,343. Its county seat and largest city is Springfield, the state capital.