Illinois County Map With Cities

Complete list of all 102 counties in Illinois with population, area, and median income — plus a free printable blank map.

Counties

102

Population

12,694,745

Area

55,519 sq mi

Capital

Springfield

Time Zone

Central (CT)

Tap or click any county for details. Need a printable version? Blank Illinois county map (PDF/PNG/SVG).

All 102 Illinois counties

County	Largest City	Population ▼	Area	Median Income	Cities
Cook	Chicago	5,192,497	945 mi²	$87,558	97
DuPage	Aurora	997,889	328 mi²	$117,603	32
Lake	Waukegan	701,818	444 mi²	$117,395	29
Will	Joliet	697,966	837 mi²	$114,890	23
Kane	Saint Charles	455,417	520 mi²	$109,421	22
McHenry	Crystal Lake	328,030	603 mi²	$106,081	17
Winnebago	Rockford	285,063	513 mi²	$68,575	12
Madison	Granite City	268,375	716 mi²	$79,643	27
St. Clair	Belleville	247,743	658 mi²	$76,235	20
Champaign	Champaign	208,555	996 mi²	$66,660	26
Sangamon	Springfield	194,839	868 mi²	$80,354	20
Peoria	Peoria	179,934	619 mi²	$72,442	17
McLean	Bloomington	171,878	1,183 mi²	$80,391	23
Rock Island	Moline	143,264	428 mi²	$69,415	17
Kendall	Oswego	137,344	320 mi²	$107,596	8
Tazewell	Pekin	136,384	649 mi²	$80,948	17
Kankakee	Kankakee	107,784	677 mi²	$73,498	17
LaSalle	Ottawa	106,524	1,135 mi²	$73,137	26
DeKalb	Dekalb	105,547	631 mi²	$73,976	13
Macon	Decatur	101,120	581 mi²	$64,757	13
Vermilion	Danville	72,508	898 mi²	$59,330	23
Williamson	Marion	67,368	420 mi²	$67,575	12
Adams	Quincy	64,474	855 mi²	$66,587	15
Whiteside	Sterling	56,250	684 mi²	$67,854	12
Jackson	Carbondale	51,949	584 mi²	$49,067	14
Boone	Belvidere	50,366	281 mi²	$85,361	5
Ogle	Rochelle	50,331	759 mi²	$82,101	17
Knox	Galesburg	49,261	716 mi²	$58,828	16
Henry	Kewanee	47,370	823 mi²	$73,177	16
Coles	Charleston	46,409	508 mi²	$56,596	6
Stephenson	Freeport	44,964	565 mi²	$66,020	14
Marion	Centralia	41,882	572 mi²	$59,979	10
Monroe	Waterloo	41,698	385 mi²	$100,121	8
Macoupin	Carlinville	40,329	863 mi²	$71,450	19
Franklin	Benton	38,590	409 mi²	$57,293	17
Grundy	Morris	37,650	418 mi²	$81,286	8
Jefferson	Mount Vernon	36,570	571 mi²	$62,813	13
Woodford	Metamora	35,447	528 mi²	$99,323	12
Christian	Taylorville	34,624	709 mi²	$65,066	14
Lee	Dixon	34,166	725 mi²	$71,280	14
Fulton	Canton	33,487	866 mi²	$61,559	20
Effingham	Effingham	33,230	479 mi²	$81,810	7
Morgan	Jacksonville	32,772	569 mi²	$67,311	10
Bureau	Princeton	32,718	869 mi²	$69,684	24
Livingston	Pontiac	32,715	1,044 mi²	$74,258	17
Clinton	Breese	32,397	474 mi²	$92,319	12
Montgomery	Litchfield	28,363	704 mi²	$64,602	16
Logan	Lincoln	27,439	618 mi²	$67,992	14
McDonough	Macomb	26,254	589 mi²	$54,764	10
Iroquois	Watseka	25,512	1,117 mi²	$68,787	23
Jersey	Jerseyville	24,579	369 mi²	$80,761	8
Randolph	Chester	23,404	576 mi²	$71,183	12
Perry	Du Quoin	22,235	442 mi²	$64,124	6
Saline	Harrisburg	22,176	380 mi²	$53,073	6
Fayette	Vandalia	21,660	716 mi²	$62,063	9
Jo Daviess	Galena	21,563	601 mi²	$73,484	9
Shelby	Shelbyville	20,136	759 mi²	$71,890	13
Crawford	Robinson	18,763	444 mi²	$71,786	7
Bond	Greenville	18,611	380 mi²	$67,559	8
Hancock	Carthage	18,420	794 mi²	$66,226	17
Piatt	Monticello	17,335	439 mi²	$91,906	11
Douglas	Tuscola	16,991	417 mi²	$80,947	7
Mercer	Aledo	16,648	561 mi²	$76,100	13
Moultrie	Sullivan	16,624	336 mi²	$74,906	5
Edgar	Paris	16,398	623 mi²	$61,194	8
Union	Anna	16,172	413 mi²	$52,082	7
Carroll	Savanna	16,069	445 mi²	$64,895	7
Clark	Marshall	16,004	501 mi²	$73,928	7
Richland	Olney	15,733	360 mi²	$62,649	6
Lawrence	Lawrenceville	15,084	372 mi²	$61,411	4
De Witt	Clinton	15,064	398 mi²	$73,849	8
Pike	Pittsfield	15,055	831 mi²	$60,861	15
White	Carmi	15,014	495 mi²	$53,961	11
Warren	Monmouth	14,945	542 mi²	$66,317	8
Wayne	Fairfield	14,900	714 mi²	$56,653	12
Massac	Metropolis	14,647	237 mi²	$63,872	5
Clay	Flora	14,241	468 mi²	$57,810	7
Ford	Paxton	13,576	486 mi²	$62,094	9
Cass	Beardstown	13,328	376 mi²	$67,747	6
Johnson	Vienna	13,046	344 mi²	$59,254	8
Washington	Nashville	12,898	563 mi²	$78,838	10
Menard	Petersburg	12,203	314 mi²	$83,163	6
Greene	Carrollton	12,035	543 mi²	$63,897	10
Wabash	Mount Carmel	10,905	223 mi²	$58,696	4
Mason	Havana	10,735	539 mi²	$61,336	8
Marshall	Lacon	9,553	387 mi²	$74,125	8
Cumberland	Neoga	9,473	346 mi²	$74,650	5
Jasper	Newton	9,235	495 mi²	$73,851	8
Hamilton	McLeansboro	7,466	435 mi²	$62,451	4
Schuyler	Rushville	6,524	437 mi²	$64,824	6
Brown	Mount Sterling	6,312	306 mi²	$67,158	3
Pope	Golconda	5,985	369 mi²	$69,688	5
Henderson	Oquawka	5,743	379 mi²	$61,275	8
Putnam	Granville	5,673	160 mi²	$78,714	7
Stark	Wyoming	5,642	288 mi²	$62,915	5
Edwards	Albion	5,417	222 mi²	$65,679	4
Alexander	Cairo	4,841	236 mi²	$50,212	7
Scott	Winchester	4,569	251 mi²	$65,541	4
Pulaski	Mounds	4,470	199 mi²	$45,863	8
Gallatin	Shawneetown	4,433	323 mi²	$63,921	5
Calhoun	Hardin	3,965	254 mi²	$97,581	8
Hardin	Elizabethtown	3,183	178 mi²	$51,425	3

How many counties does Illinois have?

Illinois has 102 counties covering 55,519 square miles and roughly 12,694,745 residents. The state was admitted to the Union in 1818 as the 21st state, and the current county boundaries reflect more than a century of administrative subdivision.

The largest county by land area is McLean County at 1,183 square miles, home to about 171,878 residents. The most populous is Cook County with approximately 5,192,497 residents — a density of about 5,495 people per square mile.

At the other end of the scale, Hardin County has only about 3,183 residents.

Illinois’s capital is Springfield, while the largest city is Chicago — a common pattern in the United States, where many states placed their capitals in smaller, more central towns rather than their largest commercial hubs.

Related resources

Download a printable outline of Illinois’s county boundaries from our blank map of Illinois page — available in SVG, PNG, and PDF.

Use the What County Am I In? tool to detect which Illinois county a GPS location or address falls in, or the Address to County Lookup for batch input.

For demographic radius analysis, the Find ZIP Codes in Radius and Population Within Radius tools let you draw a circle around any Illinois address and see every ZIP code and the total population inside.

Two SimpleMapLab studies cover Illinois specifically: the 100-mile radius around Springfield measures how much of the state lives within 100 miles of its capitol, and the loneliest town in Illinois ranks the state’s most isolated inhabited place. The county-counts blog post puts Illinois’s 102 counties in national context.

Frequently asked questions

Illinois has 102 counties. The state was admitted to the Union in 1818 as the 21st state. County boundaries have shifted over time as the population spread and new administrative units were carved from existing ones.

McLean County is the largest by land area at 1,183 square miles, with about 171,878 residents.

Cook County is the most populous, with approximately 5,192,497 residents over 945 square miles.

Hardin County has the smallest population at about 3,183 residents.

Springfield is the state capital. The largest city is Chicago — a common pattern in the US, where many states placed their capitals in smaller, more central towns rather than their largest commercial hubs.

Population, area, and demographic figures are aggregated from ZIP-code-level US Census data (via the SimpleMaps dataset) and the US Census Gazetteer. County boundaries used to render the map are from the US Atlas TopoJSON build of the Census Bureau's TIGER/Line shapefiles. The data is public domain.

Data sources

Population and demographics are aggregated from ZIP-code-level US Census data via the SimpleMaps dataset. Countiesboundaries are from the US Atlas TopoJSON build of the Census Bureau’s TIGER/Line shapefiles. Land area is from the Census Gazetteer. State counts follow the US Census Bureau’s definition of counties and county-equivalents (50 states + DC = 3,144). All sources are public domain.

Neighboring states