Sangamon County is 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.
Sangamon County is included in the Springfield, IL Metropolitan Statistical Area.
Wikipedia https://en.wikipedia.org/wiki/Sangamon_County,_Illinois
Official Website https://www.co.sangamon.il.us/
Coordinates 39°45'44.52" N -89°38'43.766" E