Illinois County Map
Illinois consists of 102 counties, each of which functions as a local government unit.
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About the map:
This Illinois County Map shows the state border, county borders, and county names.
Attribution is required! You may download, print or use the above map for educational, personal and non-commercial purposes. You must place a hyperlink (to this page) with attribution next to the image you use.
Map of Counties and County Seats in Illinois
Image info: Size: 1300x1719px / 789 Kb, file format: JPEG, Author: Mapsius.com Team
About the map:
This Map of Counties and County Seats in Illinois shows state borders, state names, Lake Michigan, state capital city, county borders, county names and county seats.
County seats are indicated by a red circle, the state capital city is indicated by a star in the red circle. The larger the city in terms of population, the larger the circle on the map and the larger the font of the city name.
Attribution is required! You may download, print or use the above map for educational, personal and non-commercial purposes. You must place a hyperlink (to this page) with attribution next to the image you use.
List of counties in Illinois
Illinois is comprised of 102 counties. Cook County, where Chicago is located, is the most populous with over 5 million people. McLean County is the largest, covering about 1,184 square miles and characterized by extensive farmland.
| County | County Seat | Area | Population (2023)[1] | FIPS Code |
|---|---|---|---|---|
| Adams County | Quincy | 855 sq mi (2,214 km2) | 64,441 | 001 |
| Alexander County | Cairo | 236 sq mi (611 km2) | 4,695 | 003 |
| Bond County | Greenville | 380 sq mi (984 km2) | 16,450 | 005 |
| Boone County | Belvidere | 280 sq mi (725 km2) | 53,202 | 007 |
| Brown County | Mount Sterling | 305 sq mi (790 km2) | 6,294 | 009 |
| Bureau County | Princeton | 869 sq mi (2,251 km2) | 32,729 | 011 |
| Calhoun County | Hardin | 253 sq mi (655 km2) | 4,317 | 013 |
| Carroll County | Mount Carroll | 445 sq mi (1,153 km2) | 15,526 | 015 |
| Cass County | Virginia | 375 sq mi (971 km2) | 12,596 | 017 |
| Champaign County | Urbana | 996 sq mi (2,580 km2) | 205,644 | 019 |
| Christian County | Taylorville | 709 sq mi (1,836 km2) | 33,228 | 021 |
| Clark County | Marshall | 501 sq mi (1,298 km2) | 15,088 | 023 |
| Clay County | Louisville | 468 sq mi (1,212 km2) | 12,999 | 025 |
| Clinton County | Carlyle | 474 sq mi (1,228 km2) | 36,785 | 027 |
| Coles County | Charleston | 508 sq mi (1,316 km2) | 46,060 | 029 |
| Cook County | Chicago | 944 sq mi (2,445 km2) | 5,087,072 | 031 |
| Crawford County | Robinson | 443 sq mi (1,147 km2) | 18,300 | 033 |
| Cumberland County | Toledo | 345 sq mi (894 km2) | 10,261 | 035 |
| DeKalb County | Sycamore | 631 sq mi (1,634 km2) | 100,288 | 037 |
| DeWitt County | Clinton | 397 sq mi (1,028 km2) | 15,365 | 039 |
| Douglas County | Tuscola | 416 sq mi (1,077 km2) | 19,629 | 041 |
| DuPage County | Wheaton | 327 sq mi (847 km2) | 921,213 | 043 |
| Edgar County | Paris | 623 sq mi (1,614 km2) | 16,334 | 045 |
| Edwards County | Albion | 222 sq mi (575 km2) | 5,968 | 047 |
| Effingham County | Effingham | 478 sq mi (1,238 km2) | 34,331 | 049 |
| Fayette County | Vandalia | 716 sq mi (1,854 km2) | 21,164 | 051 |
| Ford County | Paxton | 485 sq mi (1,256 km2) | 13,250 | 053 |
| Franklin County | Benton | 408 sq mi (1,057 km2) | 37,138 | 055 |
| Fulton County | Lewistown | 865 sq mi (2,240 km2) | 32,541 | 057 |
| Gallatin County | Shawneetown | 322 sq mi (834 km2) | 4,670 | 059 |
| Greene County | Carrollton | 543 sq mi (1,406 km2) | 11,543 | 061 |
| Grundy County | Morris | 418 sq mi (1,083 km2) | 53,578 | 063 |
| Hamilton County | McLeansboro | 434 sq mi (1,124 km2) | 7,911 | 065 |
| Hancock County | Carthage | 793 sq mi (2,054 km2) | 17,186 | 067 |
| Hardin County | Elizabethtown | 177 sq mi (458 km2) | 3,569 | 069 |
| Henderson County | Oquawka | 378 sq mi (979 km2) | 6,088 | 071 |
| Henry County | Cambridge | 822 sq mi (2,129 km2) | 48,448 | 073 |
| Iroquois County | Watseka | 1,117 sq mi (2,893 km2) | 26,136 | 075 |
| Jackson County | Murphysboro | 584 sq mi (1,513 km2) | 52,141 | 077 |
| Jasper County | Newton | 494 sq mi (1,279 km2) | 9,144 | 079 |
| Jefferson County | Mount Vernon | 571 sq mi (1,479 km2) | 36,320 | 081 |
| Jersey County | Jerseyville | 369 sq mi (956 km2) | 21,091 | 083 |
| Jo Daviess County | Galena | 600 sq mi (1,554 km2) | 21,756 | 085 |
| Johnson County | Vienna | 343 sq mi (888 km2) | 13,326 | 087 |
| Kane County | Geneva | 519 sq mi (1,344 km2) | 514,982 | 089 |
| Kankakee County | Kankakee | 676 sq mi (1,751 km2) | 105,940 | 091 |
| Kendall County | Yorkville | 320 sq mi (829 km2) | 139,976 | 093 |
| Knox County | Galesburg | 716 sq mi (1,854 km2) | 48,411 | 095 |
| Lake County | Waukegan | 443 sq mi (1,147 km2) | 708,760 | 097 |
| LaSalle County | Ottawa | 1,135 sq mi (2,940 km2) | 108,309 | 099 |
| Lawrence County | Lawrenceville | 372 sq mi (963 km2) | 14,813 | 101 |
| Lee County | Dixon | 724 sq mi (1,875 km2) | 33,654 | 103 |
| Livingston County | Pontiac | 1,043 sq mi (2,701 km2) | 35,320 | 105 |
| Logan County | Lincoln | 618 sq mi (1,601 km2) | 27,590 | 107 |
| Macon County | Decatur | 580 sq mi (1,502 km2) | 100,591 | 115 |
| Macoupin County | Carlinville | 862 sq mi (2,233 km2) | 44,018 | 117 |
| Madison County | Edwardsville | 716 sq mi (1,854 km2) | 262,752 | 119 |
| Marion County | Salem | 572 sq mi (1,481 km2) | 36,673 | 121 |
| Marshall County | Lacon | 386 sq mi (1,000 km2) | 11,683 | 123 |
| Mason County | Havana | 539 sq mi (1,396 km2) | 12,523 | 125 |
| Massac County | Metropolis | 237 sq mi (614 km2) | 13,661 | 127 |
| McDonough County | Macomb | 589 sq mi (1,526 km2) | 26,839 | 109 |
| McHenry County | Woodstock | 603 sq mi (1,562 km2) | 312,800 | 111 |
| McLean County | Bloomington | 1,183 sq mi (3,064 km2) | 170,441 | 113 |
| Menard County | Petersburg | 314 sq mi (813 km2) | 11,954 | 129 |
| Mercer County | Aledo | 561 sq mi (1,453 km2) | 15,487 | 131 |
| Monroe County | Waterloo | 385 sq mi (997 km2) | 34,957 | 133 |
| Montgomery County | Hillsboro | 703 sq mi (1,821 km2) | 27,663 | 135 |
| Morgan County | Jacksonville | 568 sq mi (1,471 km2) | 32,140 | 137 |
| Moultrie County | Sullivan | 335 sq mi (868 km2) | 14,342 | 139 |
| Ogle County | Oregon | 758 sq mi (1,963 km2) | 51,265 | 141 |
| Peoria County | Peoria | 618 sq mi (1,601 km2) | 177,513 | 143 |
| Perry County | Pinckneyville | 441 sq mi (1,142 km2) | 20,503 | 145 |
| Piatt County | Monticello | 439 sq mi (1,137 km2) | 16,714 | 147 |
| Pike County | Pittsfield | 831 sq mi (2,152 km2) | 14,342 | 149 |
| Pope County | Golconda | 368 sq mi (953 km2) | 3,707 | 151 |
| Pulaski County | Mound City | 199 sq mi (515 km2) | 4,911 | 153 |
| Putnam County | Hennepin | 160 sq mi (414 km2) | 5,561 | 155 |
| Randolph County | Chester | 575 sq mi (1,489 km2) | 29,815 | 157 |
| Richland County | Olney | 360 sq mi (932 km2) | 15,488 | 159 |
| Rock Island County | Rock Island | 427 sq mi (1,106 km2) | 141,236 | 161 |
| Saline County | Harrisburg | 379 sq mi (982 km2) | 22,873 | 165 |
| Sangamon County | Springfield | 868 sq mi (2,248 km2) | 193,491 | 167 |
| Schuyler County | Rushville | 437 sq mi (1,132 km2) | 6,733 | 169 |
| Scott County | Winchester | 250 sq mi (647 km2) | 4,710 | 171 |
| Shelby County | Shelbyville | 758 sq mi (1,963 km2) | 20,568 | 173 |
| St. Clair County | Belleville | 657 sq mi (1,702 km2) | 251,018 | 163 |
| Stark County | Toulon | 288 sq mi (746 km2) | 5,218 | 175 |
| Stephenson County | Freeport | 564 sq mi (1,461 km2) | 43,105 | 177 |
| Tazewell County | Pekin | 646 sq mi (1,673 km2) | 129,541 | 179 |
| Union County | Jonesboro | 413 sq mi (1,070 km2) | 16,667 | 181 |
| Vermilion County | Danville | 898 sq mi (2,326 km2) | 71,652 | 183 |
| Wabash County | Mount Carmel | 223 sq mi (578 km2) | 10,942 | 185 |
| Warren County | Monmouth | 542 sq mi (1,404 km2) | 16,185 | 187 |
| Washington County | Nashville | 562 sq mi (1,456 km2) | 13,536 | 189 |
| Wayne County | Fairfield | 713 sq mi (1,847 km2) | 15,761 | 191 |
| White County | Carmi | 494 sq mi (1,279 km2) | 13,401 | 193 |
| Whiteside County | Morrison | 684 sq mi (1,772 km2) | 54,498 | 195 |
| Will County | Joliet | 835 sq mi (2,163 km2) | 700,728 | 197 |
| Williamson County | Marion | 420 sq mi (1,088 km2) | 66,706 | 199 |
| Winnebago County | Rockford | 513 sq mi (1,329 km2) | 280,922 | 201 |
| Woodford County | Eureka | 527 sq mi (1,365 km2) | 38,285 | 203 |