Jerseyville is a city in Jersey County, Illinois, United States. As of the 2010 U.S. census, the city had a total population of 8,465. It is the county seat of Jersey County, and is also the largest city in the county. The city's current mayor is Richard Perdun.
Jerseyville is a part of Southern Illinois, the Metro-East region, and the St. Louis Metropolitan Statistical Area.
Jerseyville is located at 39°7′15″N 90°19′39″W / 39.12083°N 90.3275°W / 39.12083; -90.3275 (39.120789, -90.327545).