|Calhoun County Illinois Cities/Towns - Batchtown, Brussels, Hamburg, Hardin (County Seat), Kampsville
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Calhoun County is located in the U.S. state of Illinois. The population was 4,894 at the 2016 official US Census estimate. The county seat is Hardin.
The territory was inhabited for thousands of years by indigenous people along the river fronts. The remains of their and later Native American settlements have provided some of the most valuable archaeological excavations in the country.
Calhoun County was not settled by European Americans until the 19th century, and was organized in 1825. It was named for South Carolina politician John C. Calhoun, then Vice President of the United States.