County · Illinois

Calhoun County

Calhoun County is a county in the U.S. state of Illinois. As of the 2020 census, the population was 4,437, making it Illinois’ third-least populous county. Its county seat and biggest community is Hardin, with a population of 801. Its smallest incorporated community is Hamburg, with a population of 99. Calhoun County is at the tip of the peninsula formed by the courses of the Mississippi and Illinois rivers above their confluence and is almost completely surrounded by water. Calhoun County is sparsely populated; it has just five municipalities, all of them villages.

Governance bodies

County Board Primary
governing council

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Cities and towns 5

Reference data (Census of Governments 2022)

Census ID (PID6): 162122
FIPS state: 17
FIPS county: 013
FIPS place: 99013
Census record name: COUNTY OF CALHOUN
Mailing address: PO BOX 306, HARDIN 62047