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Blank map of Illinois by county

All 102 counties of Illinois, ready to print on Letter, Tabloid, A4 or A3, or to download as PNG and SVG. Free, no sign-up.

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Mapsfera · data US Census Bureau

Illinois on the map

Illinois has 102 counties, the 7th most of any state. The largest is McLean, with 1,183 sq mi of land, and the smallest is Putnam, with 160 sq mi: McLean is about 7 times bigger.

The state capital, Springfield, is in Sangamon County. The capital version marks it on the map.

Cook County is the most populous, with 5,194,625 people in 2025, or 41% of the state. The least populous is Hardin, with 3,588. Since 2020, Kendall has grown the fastest (+10.3%) and Alexander has lost the most (−12.8%).

What each county borders

LaSalle borders the most counties in the state: 9 (Bureau, DeKalb, Grundy, Kendall, Lee, Livingston, Marshall, Putnam, and Woodford).

39 counties touch another state. 12 border Missouri: Adams, Alexander, Calhoun, Hancock, Jackson, Jersey, Madison, Monroe and 4 more. 12 border Indiana: Clark, Cook, Crawford, Edgar, Gallatin, Iroquois, Kankakee, Lawrence and 4 more. 7 border Iowa: Carroll, Hancock, Henderson, Jo Daviess, Mercer, Rock Island, and Whiteside. 6 border Kentucky: Alexander, Gallatin, Hardin, Massac, Pope, and Pulaski. 6 border Wisconsin: Boone, Jo Daviess, Lake, McHenry, Stephenson, and Winnebago.

2 counties are on the shore of the Great Lakes: Cook and Lake. 63 counties are fully inland, with no coast and no border with another state or country.

Number key

Numbers follow alphabetical order, from 1 (Adams) to 102 (Woodford). Boone, Cass, Edwards, Hardin, Pulaski, and Putnam are too small for a number on Letter or A4 but keep their number in the table; Tabloid and A3 fit more. Area is land area, without lakes or sea, and population is the Census estimate for July 1, 2025; “Borders” counts neighboring counties in the same state.

Show the whole table (102 rows)

No.	County	Land area	Population (2025)	Borders
1	Adams	855 sq mi	64,267	4
2	Alexander	235 sq mi	4,570	2
3	Bond	380 sq mi	16,959	4
4	Boone	281 sq mi	53,568	3
5	Brown	306 sq mi	6,401	5
6	Bureau	869 sq mi	32,510	7
7	Calhoun	254 sq mi	4,300	3
8	Carroll	445 sq mi	15,419	4
9	Cass	376 sq mi	12,463	6
10	Champaign	996 sq mi	209,972	5
11	Christian	710 sq mi	33,443	4
12	Clark	501 sq mi	15,114	5
13	Clay	468 sq mi	12,793	6
14	Clinton	474 sq mi	37,128	6
15	Coles	508 sq mi	46,607	6
16	Cook	945 sq mi	5,194,625	5
17	Crawford	444 sq mi	18,648	4
18	Cumberland	346 sq mi	10,208	5
19	De Witt	398 sq mi	15,118	4
20	DeKalb	631 sq mi	101,835	7
21	Douglas	417 sq mi	19,880	5
22	DuPage	328 sq mi	934,298	3
23	Edgar	623 sq mi	16,323	4
24	Edwards	222 sq mi	5,898	4
25	Effingham	479 sq mi	34,519	5
26	Fayette	716 sq mi	20,790	7
27	Ford	486 sq mi	13,216	6
28	Franklin	409 sq mi	36,916	6
29	Fulton	866 sq mi	32,901	7
30	Gallatin	323 sq mi	4,616	3
31	Greene	543 sq mi	11,313	6
32	Grundy	418 sq mi	54,052	5
33	Hamilton	435 sq mi	7,859	5
34	Hancock	794 sq mi	16,803	4
35	Hardin	177 sq mi	3,588	3
36	Henderson	379 sq mi	5,984	4
37	Henry	823 sq mi	48,095	6
38	Iroquois	1,117 sq mi	26,150	3
39	Jackson	584 sq mi	52,501	5
40	Jasper	495 sq mi	9,032	6
41	Jefferson	571 sq mi	36,147	6
42	Jersey	370 sq mi	21,160	4
43	Jo Daviess	601 sq mi	21,594	2
44	Johnson	344 sq mi	13,363	5
45	Kane	519 sq mi	525,757	5
46	Kankakee	676 sq mi	105,525	5
47	Kendall	320 sq mi	145,470	5
48	Knox	716 sq mi	47,767	6
49	Lake	444 sq mi	719,339	2
50	LaSalle	1,135 sq mi	107,773	9
51	Lawrence	372 sq mi	13,790	3
52	Lee	725 sq mi	32,914	5
53	Livingston	1,044 sq mi	35,057	6
54	Logan	618 sq mi	27,182	7
55	Macon	581 sq mi	99,300	7
56	Macoupin	863 sq mi	43,748	6
57	Madison	716 sq mi	263,110	6
58	Marion	573 sq mi	36,382	6
59	Marshall	387 sq mi	11,473	6
60	Mason	539 sq mi	12,411	6
61	Massac	237 sq mi	13,502	3
62	McDonough	589 sq mi	25,916	5
63	McHenry	603 sq mi	317,751	5
64	McLean	1,183 sq mi	171,419	8
65	Menard	314 sq mi	11,863	4
66	Mercer	561 sq mi	15,229	5
67	Monroe	385 sq mi	34,840	2
68	Montgomery	704 sq mi	28,076	7
69	Morgan	569 sq mi	32,515	7
70	Moultrie	336 sq mi	14,371	5
71	Ogle	759 sq mi	51,399	6
72	Peoria	619 sq mi	178,553	6
73	Perry	442 sq mi	20,160	5
74	Piatt	439 sq mi	16,791	6
75	Pike	831 sq mi	14,231	6
76	Pope	369 sq mi	3,672	4
77	Pulaski	199 sq mi	4,820	4
78	Putnam	160 sq mi	5,619	3
79	Randolph	575 sq mi	29,921	5
80	Richland	360 sq mi	15,219	7
81	Rock Island	427 sq mi	141,869	3
82	Saline	380 sq mi	22,772	6
83	Sangamon	868 sq mi	194,170	8
84	Schuyler	437 sq mi	6,657	7
85	Scott	251 sq mi	4,866	3
86	Shelby	758 sq mi	20,576	8
87	St. Clair	658 sq mi	250,708	5
88	Stark	288 sq mi	5,319	5
89	Stephenson	564 sq mi	43,220	4
90	Tazewell	646 sq mi	130,049	6
91	Union	413 sq mi	16,656	5
92	Vermilion	898 sq mi	71,259	4
93	Wabash	223 sq mi	10,907	4
94	Warren	542 sq mi	16,222	5
95	Washington	563 sq mi	13,564	6
96	Wayne	714 sq mi	15,882	7
97	White	495 sq mi	13,250	5
98	Whiteside	684 sq mi	54,121	6
99	Will	836 sq mi	712,253	5
100	Williamson	420 sq mi	67,225	5
101	Winnebago	513 sq mi	283,674	3
102	Woodford	528 sq mi	38,111	6

More blank maps

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Wisconsin 72 counties

Indiana 92 counties

Iowa 99 counties

US states 50 states

Frequently asked questions

How many counties does Illinois have?

102 counties. That’s the 7th most of any state.

What is the largest county in Illinois?

McLean, with 1,183 sq mi of land. The smallest is Putnam, with 160 sq mi.

What is the most populous county in Illinois?

Cook County, with an estimated 5,194,625 people in 2025, or 41% of the state.

What county is Springfield in?

The state capital, Springfield, is in Sangamon County.

Can I use it in class?

Yes, it’s free. Print it, copy it and hand it out as many times as you like. If you post it on a blog or a class website, credit “Mapsfera · data US Census Bureau”.

How do I print it on US Letter paper?

Choose Letter in “Paper size” and click “Download PDF”. In the print window, pick Letter paper and 100% scale (“Actual size”). For a bigger map, choose Tabloid (11 × 17 in) or A3.

What order are the numbers in?

Alphabetical, from 1 to the last one. That makes the key easy to follow when you grade, and it’s the same key the worksheet’s answer page uses.

Sources

Boundaries: U.S. Census Bureau, Cartographic Boundary Files 2025, counties at 1:500,000 (public domain)
Land and water area: U.S. Census Bureau (TIGER/Line and 2025 Gazetteer); population: Vintage 2025 estimates (July 1, 2025)
State capital: Natural Earth, Populated Places (public domain); which counties it spans, Census places
Neighbors, coastline and borders: calculated from those boundaries (and checked against the Census county adjacency file)