Jersey County, Illinois

Jersey County
Jersey County
County
	Jersey County Courthouse in Jerseyville
	Location within the U.S. state of Illinois
	Illinois's location within the U.S.
	Coordinates: 39°05′N 90°22′W / 39.09°N 90.36°W
Country	United States
State	Illinois
Founded	February 28, 1839
Named for	New Jersey
Seat	Jerseyville
Largest city	Jerseyville
Area
• Total	377 sq mi (980 km2)
• Land	369 sq mi (960 km2)
• Water	7.9 sq mi (20 km2) 2.1%
Population (2020)
• Total	21,512
• Density	57/sq mi (22/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	15th
Website	www.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.

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

[QF-1] "State & County QuickFacts". United States Census Bureau. Archived from the original on June 6, 2011. Retrieved July 6, 2014.

[GR6-2] "Find a County". National Association of Counties. Archived from the original on May 9, 2015. Retrieved June 7, 2011.

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