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County · code 17083

Jersey CountyIllinois

Jersey County is a county in Illinois with its seat in Jerseyville, formed in 1839 from Greene County.

  • Founded1839
  • County seatJerseyville
  • Named forNew Jersey
  • Land area370 sq mi + 7.9 sq mi water
  • Population21,512 2020 Census
  • Parcels mapped14,795 checked 16 October 2026
Open the free map Click any parcel in Jersey County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

GreeneCalhounSt. Charles, MOMadison Jerseyville Census outline · seat marked

Where it is

Jersey on the map of Illinois

Illinois has 102 counties and county equivalents, each with its own records office. Shapes with a page are links.

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Counties of Illinois · Jersey highlighted

History

Formed in 1839 from Greene County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Jersey County was created from Greene County on August 5, 1839, and named after New Jersey. In 1851, Jersey exchanged territory with Greene County.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1839
    Jersey County created Jersey created from Greene.
    from Greene
    · Ill. Laws 1838-1839, pp. 208-211
  2. 1851
    Exchanged territory Jersey exchanged with Greene.
    with Greene
    · Ill. Laws 1851, gen., pp. 145-146

Land and parcels

What the maps cover in Jersey

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Jersey by the Census

Population
21,512 2020 Census count
Housing units
9,754 2020 Census count
Land area
370 square miles
Water area
7.9 square miles
People per sq mi
58 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Jersey County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

Open Jersey County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Jersey County

When was Jersey County founded?
Jersey County was founded in 1839, formed from Greene County, and named after New Jersey.
What is the county seat of Jersey County?
The county seat of Jersey County is Jerseyville.
Is there an online parcel map for Jersey County?
Yes. Jersey County publishes a parcel map of 14,795 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Jersey County's boundary or name changed?
Jersey County was created in 1839 from Greene County. Since then the Atlas of Historical County Boundaries records 1 later change, chiefly involving Greene County.
Is my lot in a flood zone?
We do not have flood maps for Jersey County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door