Illinois

Illinois has 102 Counties.

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  • Illinois Association of County Board Members
    413 West Monroe St. 2nd Flr.
    Springfield, IL 62704-1959
    Phone: (217) 528-5331
    Fax: (217)528-5562
    http://www.ilcounty.org

    Metro Counties of Illinois
    220 East Adams
    Springfield, IL 62701
    Phone: (217)522-1190
    Fax: (217)525-2526

    United Counties Council of Illinois
    217 East Monroe, Suite 101
    Springfield, IL 62701-1743
    Phone: (217)544-5585
    Fax: (217)544-5571

    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