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Illinois county map

See all 102 counties on one clear, labelled map. Use the alphabetical table below to verify names and compare land area.

Boundary vintage: 2025Source: U.S. Census BureauUpdated September 15, 2026
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Labelled map of Illinois counties AdamsAlexanderBondBooneBrownBureauCalhounCarrollCassChampaignChristianClarkClayClintonColesCookCrawfordCumberlandDe WittDeKalbDouglasDuPageEdgarEdwardsEffinghamFayetteFordFranklinFultonGallatinGreeneGrundyHamiltonHancockHardinHendersonHenryIroquoisJacksonJasperJeffersonJerseyJo DaviessJohnsonKaneKankakeeKendallKnoxLakeLaSalleLawrenceLeeLivingstonLoganMaconMacoupinMadisonMarionMarshallMasonMassacMcDonoughMcHenryMcLeanMenardMercerMonroeMontgomeryMorganMoultrieOglePeoriaPerryPiattPikePopePulaskiPutnamRandolphRichlandRock IslandSalineSangamonSchuylerScottShelbySt. ClairStarkStephensonTazewellUnionVermilionWabashWarrenWashingtonWayneWhiteWhitesideWillWilliamsonWinnebagoWoodford
Boundary data: U.S. Census Bureau 2025 cartographic boundary files. Zoom in for county names, then drag the map or use the arrow keys to move around.
Map scope: This is a county boundary reference map. It does not show roads, parcels, ZIP codes, election precincts, or terrain.

Alphabetical list of Illinois counties

The land-area figures are rounded to the nearest square mile. Water area is shown separately so large lakes or coastal waters do not obscure the comparison.

NameFIPS codeLand areaWater area
Adams County17001855 sq mi16 sq mi
Alexander County17003235 sq mi17 sq mi
Bond County17005380 sq mi2 sq mi
Boone County17007281 sq mi1 sq mi
Brown County17009306 sq mi2 sq mi
Bureau County17011869 sq mi4 sq mi
Calhoun County17013254 sq mi30 sq mi
Carroll County17015445 sq mi22 sq mi
Cass County17017376 sq mi8 sq mi
Champaign County17019996 sq mi2 sq mi
Christian County17021709 sq mi6 sq mi
Clark County17023501 sq mi3 sq mi
Clay County17025468 sq mi1 sq mi
Clinton County17027474 sq mi29 sq mi
Coles County17029508 sq mi2 sq mi
Cook County17031945 sq mi690 sq mi
Crawford County17033444 sq mi2 sq mi
Cumberland County17035346 sq mi1 sq mi
De Witt County17039398 sq mi8 sq mi
DeKalb County17037631 sq mi3 sq mi
Douglas County17041417 sq mi1 sq mi
DuPage County17043328 sq mi8 sq mi
Edgar County17045623 sq mi1 sq mi
Edwards County17047222 sq mi0 sq mi
Effingham County17049479 sq mi1 sq mi
Fayette County17051716 sq mi9 sq mi
Ford County17053486 sq mi1 sq mi
Franklin County17055409 sq mi23 sq mi
Fulton County17057866 sq mi17 sq mi
Gallatin County17059323 sq mi5 sq mi
Greene County17061543 sq mi3 sq mi
Grundy County17063418 sq mi12 sq mi
Hamilton County17065435 sq mi1 sq mi
Hancock County17067794 sq mi21 sq mi
Hardin County17069177 sq mi4 sq mi
Henderson County17071379 sq mi16 sq mi
Henry County17073823 sq mi3 sq mi
Iroquois County170751,117 sq mi2 sq mi
Jackson County17077584 sq mi19 sq mi
Jasper County17079495 sq mi4 sq mi
Jefferson County17081571 sq mi13 sq mi
Jersey County17083370 sq mi8 sq mi
Jo Daviess County17085601 sq mi18 sq mi
Johnson County17087344 sq mi5 sq mi
Kane County17089519 sq mi5 sq mi
Kankakee County17091676 sq mi5 sq mi
Kendall County17093320 sq mi2 sq mi
Knox County17095716 sq mi3 sq mi
Lake County17097444 sq mi925 sq mi
LaSalle County170991,135 sq mi13 sq mi
Lawrence County17101372 sq mi2 sq mi
Lee County17103725 sq mi4 sq mi
Livingston County171051,044 sq mi2 sq mi
Logan County17107618 sq mi1 sq mi
Macon County17115581 sq mi5 sq mi
Macoupin County17117863 sq mi5 sq mi
Madison County17119716 sq mi24 sq mi
Marion County17121573 sq mi4 sq mi
Marshall County17123387 sq mi12 sq mi
Mason County17125539 sq mi24 sq mi
Massac County17127237 sq mi5 sq mi
McDonough County17109589 sq mi1 sq mi
McHenry County17111603 sq mi8 sq mi
McLean County171131,183 sq mi3 sq mi
Menard County17129314 sq mi1 sq mi
Mercer County17131561 sq mi7 sq mi
Monroe County17133385 sq mi13 sq mi
Montgomery County17135704 sq mi6 sq mi
Morgan County17137569 sq mi3 sq mi
Moultrie County17139336 sq mi9 sq mi
Ogle County17141759 sq mi5 sq mi
Peoria County17143619 sq mi12 sq mi
Perry County17145442 sq mi5 sq mi
Piatt County17147439 sq mi0 sq mi
Pike County17149831 sq mi17 sq mi
Pope County17151369 sq mi6 sq mi
Pulaski County17153199 sq mi4 sq mi
Putnam County17155160 sq mi12 sq mi
Randolph County17157575 sq mi22 sq mi
Richland County17159360 sq mi2 sq mi
Rock Island County17161427 sq mi24 sq mi
Saline County17165380 sq mi7 sq mi
Sangamon County17167868 sq mi9 sq mi
Schuyler County17169437 sq mi4 sq mi
Scott County17171251 sq mi2 sq mi
Shelby County17173759 sq mi10 sq mi
St. Clair County17163658 sq mi16 sq mi
Stark County17175288 sq mi0 sq mi
Stephenson County17177564 sq mi1 sq mi
Tazewell County17179646 sq mi11 sq mi
Union County17181413 sq mi9 sq mi
Vermilion County17183898 sq mi3 sq mi
Wabash County17185223 sq mi4 sq mi
Warren County17187542 sq mi1 sq mi
Washington County17189563 sq mi1 sq mi
Wayne County17191714 sq mi2 sq mi
White County17193495 sq mi7 sq mi
Whiteside County17195684 sq mi12 sq mi
Will County17197836 sq mi13 sq mi
Williamson County17199420 sq mi24 sq mi
Winnebago County17201513 sq mi6 sq mi
Woodford County17203528 sq mi15 sq mi

Largest Illinois counties by land area

These are the five largest mapped units in Illinois by Census-reported land area:

  1. McLean County — 1,183 square miles
  2. LaSalle County — 1,135 square miles
  3. Iroquois County — 1,117 square miles
  4. Livingston County — 1,044 square miles
  5. Champaign County — 996 square miles

How to read and use this map

County lines are administrative boundaries, not postal routes. A mailing address can use a city name associated with a neighboring area, and ZIP codes can cross county lines. When you need to identify a county for an address, confirm it with an official geocoder or local government source.

For classroom or planning use, print directly from this page. If labels become crowded, choose landscape orientation and reduce page margins. The underlying vector lines remain crisp at different sizes.

Frequently asked questions

How many counties are in Illinois?

Illinois has 102 counties in the U.S. Census Bureau’s 2025 cartographic boundary file.

Can I print this Illinois county map?

Yes. Choose Print map and use landscape orientation for the widest map. Because the map is SVG, its boundary lines stay sharp when scaled.

Are these legal survey boundaries?

No. This is a generalized reference map. Property, parcel, election, and legal boundary questions should be checked with the relevant state or local agency.

Map source

U.S. Census Bureau, 2025 Cartographic Boundary File, Counties, 1:20,000,000. Land and water area fields are supplied in the same file and converted from square meters to square miles. Accessed September 15, 2026.