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County · code 17061

Greene CountyIllinois

Greene County is a county in Illinois with its seat in Carrollton, formed in 1821.

  • Founded1821
  • County seatCarrollton
  • Named forNathanael Greene
  • Land area543 sq mi + 3.3 sq mi water
  • Population11,985 2020 Census
  • Parcels mapped12,054 checked 15 October 2026
Open the free map Click any parcel in Greene County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

JerseyScottCalhounMacoupinPike Carrollton Census outline · seat marked

Where it is

Greene on the map of Illinois

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

Adams CountyAlexander CountyBond CountyBoone CountyBrown CountyBureau CountyCalhoun CountyCarroll CountyCass CountyChampaign CountyChristian CountyClark CountyClay CountyClinton CountyColes CountyCook CountyCrawford CountyCumberland CountyDeKalb CountyDe Witt CountyDouglas CountyDuPage CountyEdgar CountyEdwards CountyEffingham CountyFayette CountyFord CountyFranklin CountyFulton CountyGallatin CountyGrundy CountyHamilton CountyHancock CountyHardin CountyHenderson CountyHenry CountyIroquois CountyJackson CountyJasper CountyJefferson CountyJersey CountyJo Daviess CountyJohnson CountyKane CountyKankakee CountyKendall CountyKnox CountyLake CountyLaSalle CountyLawrence CountyLee CountyLivingston CountyLogan CountyMcDonough CountyMcHenry CountyMcLean CountyMacon CountyMacoupin CountyMadison CountyMarion CountyMarshall CountyMason CountyMassac CountyMenard CountyMercer CountyMonroe CountyMontgomery CountyMorgan CountyMoultrie CountyOgle CountyPeoria CountyPerry CountyPiatt CountyPike CountyPope CountyPulaski CountyPutnam CountyRandolph CountyRichland CountyRock Island CountySt. Clair CountySaline CountySangamon CountySchuyler CountyScott CountyShelby CountyStark CountyStephenson CountyTazewell CountyUnion CountyVermilion CountyWabash CountyWarren CountyWashington CountyWayne CountyWhite CountyWhiteside CountyWill CountyWilliamson CountyWinnebago CountyWoodford CountyGreene County Greene
Counties of Illinois · Greene highlighted

History

Formed in 1821 from Madison County

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

Greene County was created from Madison County on January 20, 1821. It was named after Nathanael Greene. Over its early decades, the county experienced boundary changes, losing territory to the creation of Morgan County in 1823, to Madison in 1825, to Macoupin County in 1829, to Jersey County in 1839, and exchanging territory with Jersey County in 1851.

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

  1. 1821
    Greene County created Greene created from Madison; part of Madison became Non-County Area 2 and was attached to Greene "for all purposes."
    from Madison
    · Ill. Laws 1820-1821, pp. 26-27
  2. 1823
    Lost territory Greene lost part of attached Non-County Area 2 to creation of Morgan.
    to Morgan
    · Ill. Laws 1822-1823, pp. 108-109; Laws 1834-1835, pp. 62-63
  3. 1825
    Lost territory Green lost part of attached Non-County Area 2 to Madison.
    to Greento Madison
    · Ill. Laws 1824-1825, p. 53
  4. 1829
    Lost territory Greene lost all of attached Non-County Area 2 to creation of Macoupin; Non-County Area 2 eliminated.
    to Macoupin
    · Ill. Rev. Code 1828-1829, pp. 26-28
  5. 1839
    Lost territory Greene lost to creation of Jersey.
    to Jersey
    · Ill. Laws 1838-1839, pp. 208-211
  6. 1843
    Changed Legislature authorized creation of Benton (proposed) from Greene, Macoupin, and Morgan, dependent on local referendum that failed (no change).
    BentonMacoupinMorgan
    · Ill. Laws 1842-1843, pp. 104-108
  7. 1851
    Exchanged territory Greene exchanged with Jersey.
    with Jersey
    · Ill. Laws 1851, gen., pp. 145-146

Land and parcels

What the maps cover in Greene

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

Greene by the Census

Population
11,985 2020 Census count
Housing units
5,785 2020 Census count
Land area
543 square miles
Water area
3.3 square miles
People per sq mi
22 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

Greene 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

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Questions

Common questions about Greene County

When was Greene County founded?
Greene County was founded in 1821, formed from Madison County, and named after Nathanael Greene.
What is the county seat of Greene County?
The county seat of Greene County is Carrollton.
Is there an online parcel map for Greene County?
Yes. A public source publishes a parcel map of 12,054 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Greene County's boundary or name changed?
Greene County was created in 1821 from Madison County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Jersey County, Green County and Macoupin County.
Is my lot in a flood zone?
We do not have flood maps for Greene 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