Sangamon County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 197,465, which is an increase of 4.5% from 188,951 in 2000. Its county seat is Springfield, the state capital. The Springfield Metropolitan Statistical Area includes Sangamon and Menard counties. According to the 2010 census, the county has a total area of 877.02 square miles , of which 868.30 square miles is land and 8.72 square miles is water. Auburn, Ball, Buffalo Hart, Capital, Cartwright, Chatham, Clear Lake, Cooper, Cotton Hill, Curran, Divernon, Fancy Creek,... Gardner, Illiopolis, Island Grove, Lanesville, Loami, Maxwell, Mechanicsburg, New Berlin, Pawnee, Rochester, Springfield, Talkington, Williams, Woodside Sangamon County was formed in 1821 out of Madison and Bond Counties. The county was named for the Sangamon River, which runs through it. The origin of the name of the river is unknown; among several explanations is the theory that is comes from the Pottawatomie word Sain-guee-mon meaning "where there is plenty to eat.
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| Founded: | 1821 |
| State: | Illinois |
| Population: | 197,822 |
| Area: | 877 sq. mi. |
| Time zone: | Central Time zone |