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is a city in Jersey County, Illinois, United States. The population was 7,984 at the 2000 census, and the population was 8,291 in the 2006 official US Census estimate. It is the county seat of Jersey County, and is also the largest city in the county. The city's current mayor is Yvonne Hartmann.
Jerseyville is a part of the Metro-East region and the St. Louis Metropolitan Statistical Area.
According to the United States Census Bureau, the city has a total area of 4.4 square miles (11.4 km²). None of it is covered by water.