Sangamon County, Illinois

"Sangamon" redirects here. For other uses, see Sangamon (disambiguation).
Not to be confused with Sangamon, Illinois.

Sangamon County, Illinois
County
Sangamon County Courthouse in 2017
Flag
Seal
Location within the U.S. state of Illinois
Coordinates: 39°46′N 89°40′W / 39.76°N 89.66°W / 39.76; -89.66
Country United States
State Illinois
Founded1821
Named afterSangamon River
SeatSpringfield
Largest citySpringfield
Area
 • Total
877 sq mi (2,270 km2)
 • Land868 sq mi (2,250 km2)
 • Water8.7 sq mi (23 km2)  1.0%
Population
 (2020)
 • Total
196,343
 • Estimate 
(2024)
194,345
 • Density226/sq mi (87.3/km2)
Congressional districts13th, 15th
Websitewww.co.sangamon.il.us

Sangamon County is a county located near 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.


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