Jersey County, Illinois

Jersey County
Jersey County Courthouse in Jerseyville
Map of Illinois highlighting Jersey County
Location within the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location within the U.S.
Coordinates: 39°05′N 90°22′W / 39.09°N 90.36°W / 39.09; -90.36
Country United States
State Illinois
FoundedFebruary 28, 1839
Named forNew Jersey
SeatJerseyville
Largest cityJerseyville
Area
 • Total377 sq mi (980 km2)
 • Land369 sq mi (960 km2)
 • Water7.9 sq mi (20 km2)  2.1%
Population
 (2020)
 • Total21,512
 • Density57/sq mi (22/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district15th
Websitewww.jerseycounty-il.us

Jersey County is a county located in the U.S. state of Illinois. At the 2020 census, it had a population of 21,512.[1] The county seat and largest community is Jerseyville, with a population of 8,337 in 2010.[2] The county's smallest incorporated community is Otterville, with a population of 87.

Jersey County is included in the St. Louis, MO-IL Metropolitan Statistical Area.

  1. ^ "State & County QuickFacts". United States Census Bureau. Archived from the original on June 6, 2011. Retrieved July 6, 2014.
  2. ^ "Find a County". National Association of Counties. Archived from the original on May 9, 2015. Retrieved June 7, 2011.