Jersey County, county in Illinois, United States. As of 2020 county had an estimated population of 21,616 inhabitants. The county was created 182 years ago in 1839. Its county seat is "Jerseyville".
There are 1 city/town in Jersey County, IL. The largest city of Jersey County is Elsah with a population of 604.
Cities, Towns, Neighborhoods & Other Populated Places in Jersey County.
|Elsah||Township in Jersey County, Illinois||Jersey||604|