Illinois

Illinois has 102 Counties

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Illinois Association of County Board Members
413 W Monroe St Fl 2Nd
Springfield, IL 62704-1881
Phone: (217)528-5331
http://www.ilcounty.org

Metro Counties of Illinois
220 E Adams St
Springfield, IL 62701-1123
Phone: 217-522-1190

United Counties Council of Illinois
217 E Monroe St Ste 101
Springfield, IL 62701-1743
Phone: (217)544-5585

County NACo
Member
2010
Population
Square
Miles
County Seat Board
Size
Founded
Adams   67,103 855 Quincy   22  1825 
Alexander   8,238 236 Cairo   1819 
Bond   17,768 380 Greenville   1817 
Boone   54,165 281 Belvidere   12  1837 
Brown   6,937 306 Mount Sterling   1839 
Bureau   34,978 869 Princeton   26  1837 
Calhoun   5,089 254 Hardin   1825 
Carroll   15,387 445 Mount Carroll   1839 
Cass 13,642 376 Virginia   11  1837 
Champaign 201,081 996 Urbana   22  1833 
Christian   34,800 709 Taylorville   16  1839 
Clark   16,335 501 Marshall   1819 
Clay   13,815 468 Louisville   14  1824 
Clinton   37,762 474 Carlyle   15  1824 
Coles   53,873 508 Charleston   12  1830 
Cook 5,194,675 945 Chicago  18  1831 
Crawford   19,817 444 Robinson   10  1816 
Cumberland   11,048 346 Toledo   1843 
De Kalb 105,160 631 Sycamore   24  1837 
De Witt 16,561 398 Clinton   12  1839 
Douglas   19,980 417 Tuscola   1859 
Du Page 916,924 328 Wheaton   19  1839 
Edgar   18,576 623 Paris   1823 
Edwards   6,721 222 Albion   1814 
Effingham   34,242 479 Effingham   1831 
Fayette 22,140 716 Vandalia   14  1821 
Ford   14,081 486 Paxton   12  1859 
Franklin   39,561 409 Benton   1818 
Fulton   37,069 866 Lewistown   21  1823 
Gallatin 5,589 323 Shawneetown   1812 
Greene   13,886 543 Carrollton   1821 
Grundy 50,063 418 Morris   18  1841 
Hamilton   8,457 435 McLeansboro   1821 
Hancock   19,104 794 Carthage   15  1825 
Hardin   4,320 178 Elizabethtown   1839 
Henderson   7,331 379 Oquawka   11  1841 
Henry   50,486 823 Cambridge   20  1825 
Iroquois   29,718 1,117 Watseka   20  1833 
Jackson   60,218 584 Murphysboro   14  1816 
Jasper   9,698 495 Newton   12  1831 
Jefferson   38,827 571 Mount Vernon   15  1819 
Jersey 22,985 369 Jerseyville   12  1839 
Jo Daviess   22,678 601 Galena   17  1827 
Johnson   12,582 344 Vienna   1812 
Kane   515,269 520 Geneva   25  1836 
Kankakee   113,449 677 Kankakee  28  1853 
Kendall 114,736 320 Yorkville   10  1841 
Knox 52,919 716 Galesburg   15  1825 
La Salle 113,924 1,135 Ottawa   29  1831 
Lake 703,462 444 Waukegan   21  1839 
Lawrence 16,833 372 Lawrenceville   1821 
Lee   36,031 725 Dixon   24  1839 
Livingston 38,950 1,044 Pontiac   24  1837 
Logan 30,305 618 Lincoln   12  1839 
Macon   110,768 581 Decatur   21  1829 
Macoupin   47,765 863 Carlinville   18  1829 
Madison 269,282 716 Edwardsville   30  1812 
Marion   39,437 572 Salem  15  1823 
Marshall 12,640 387 Lacon   12  1839 
Mason   14,666 539 Havana   1841 
Massac   15,429 237 Metropolis   1843 
McDonough   32,612 589 Macomb   21  1826 
McHenry 308,760 603 Woodstock   24  1836 
McLean 169,572 1,183 Bloomington   20  1830 
Menard   12,705 314 Petersburg   1839 
Mercer   16,434 561 Aledo   10  1825 
Monroe   32,957 385 Waterloo   1816 
Montgomery 30,104 704 Hillsboro   21  1821 
Morgan   35,547 569 Jacksonville   1823 
Moultrie 14,846 336 Sullivan   1843 
Ogle   53,497 759 Oregon   24  1836 
Peoria 186,494 619 Peoria   18  1825 
Perry   22,350 442 Pinckneyville   1827 
Piatt 16,729 439 Monticello   1841 
Pike   16,430 831 Pittsfield   1821 
Pope   4,470 369 Golconda   1816 
Pulaski   6,161 199 Mound City   1843 
Putnam 6,006 160 Hennepin   1825 
Randolph   33,476 576 Chester   1795 
Richland 16,233 360 Olney   1841 
Rock Island   147,546 428 Rock Island   25  1831 
Saline   24,913 380 Harrisburg   11  1847 
Sangamon   197,465 868 Springfield   29  1821 
Schuyler   7,544 437 Rushville   1825 
Scott   5,355 251 Winchester   1839 
Shelby   22,363 759 Shelbyville   22  1827 
St. Clair 270,056 658 Belleville   30  1790 
Stark   5,994 288 Toulon   1839 
Stephenson   47,711 565 Freeport   22  1837 
Tazewell 135,394 649 Pekin   22  1827 
Union 17,808 413 Jonesboro   1818 
Vermilion   81,625 898 Danville   27  1826 
Wabash   11,947 223 Mount Carmel   1824 
Warren   17,707 542 Monmouth   16  1825 
Washington 14,716 563 Nashville  14  1818 
Wayne   16,760 714 Fairfield   14  1819 
White   14,665 495 Carmi   1815 
Whiteside   58,498 684 Morrison   27  1836 
Will 677,560 837 Joliet   26  1836 
Williamson 66,357 420 Marion   1839 
Winnebago 295,266 513 Rockford   21  1836 
Woodford   38,664 528 Eureka   15  1841