ILLINOIS COUNTIES |
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| There are 102 administrative divisions, referred to as counties, in the state of Illinois. The population figures given below are from the 2000 census. You may list the counties by county name, by area in square miles, by year organized or by population by clicking on the column headings or using the pull-down list box. | ||||
| County | Area (sq miles) | County Seat | Established | Population (2000) |
|---|---|---|---|---|
| St. Clair County | 664 | Belleville | 1790 | 256,082 |
| Randolph County | 578 | Chester | 1795 | 33,893 |
| Gallatin County | 324 | Shawneetown | 1812 | 6,445 |
| Johnson County | 346 | Vienna | 1812 | 12,878 |
| Madison County | 725 | Edwardsville | 1812 | 258,941 |
| Edwards County | 222 | Albion | 1814 | 6,971 |
| White County | 495 | Carmi | 1815 | 15,371 |
| Crawford County | 444 | Robinson | 1816 | 20,452 |
| Jackson County | 588 | Murphysboro | 1816 | 59,612 |
| Monroe County | 388 | Waterloo | 1816 | 27,619 |
| Pope County | 371 | Golconda | 1816 | 4,413 |
| Bond County | 380 | Greenville | 1817 | 17,633 |
| Franklin County | 412 | Benton | 1818 | 39,018 |
| Union County | 416 | Jonesboro | 1818 | 18,293 |
| Washington County | 563 | Nashville | 1818 | 15,148 |
| Alexander County | 236 | Cairo | 1819 | 9,590 |
| Clark County | 502 | Marshall | 1819 | 17,008 |
| Jefferson County | 571 | Mount Vernon | 1819 | 40,045 |
| Wayne County | 714 | Fairfield | 1819 | 17,151 |
| Fayette County | 716 | Vandalia | 1821 | 21,802 |
| Hamilton County | 435 | McLeansboro | 1821 | 8,621 |
| Lawrence County | 372 | Lawrenceville | 1821 | 15,452 |
| Montgomery County | 704 | Hillsboro | 1821 | 30,652 |
| Pike County | 830 | Pittsfield | 1821 | 17,384 |
| Sangamon County | 868 | Springfield | 1821 | 188,951 |
| Edgar County | 624 | Paris | 1823 | 19,704 |
| Fulton County | 866 | Lewistown | 1823 | 38,250 |
| Marion County | 572 | Salem | 1823 | 41,691 |
| Morgan County | 569 | Jacksonville | 1823 | 36,616 |
| Clay County | 469 | Louisville | 1824 | 14,560 |
| Clinton County | 474 | Carlyle | 1824 | 35,535 |
| Wabash County | 224 | Mount Carmel | 1824 | 12,937 |
| Adams County | 857 | Quincy | 1825 | 68,277 |
| Calhoun County | 254 | Hardin | 1825 | 5,084 |
| Hancock County | 795 | Carthage | 1825 | 20,121 |
| Henry County | 823 | Cambridge | 1825 | 51,020 |
| Knox County | 716 | Galesburg | 1825 | 55,836 |
| Mercer County | 561 | Aledo | 1825 | 16,957 |
| Peoria County | 620 | Peoria | 1825 | 183,433 |
| Putnam County | 160 | Hennepin | 1825 | 6,086 |
| Schuyler County | 437 | Rushville | 1825 | 7,189 |
| Warren County | 543 | Monmouth | 1825 | 18,735 |
| McDonough County | 589 | Macomb | 1826 | 32,913 |
| Jo Daviess County | 601 | Galena | 1827 | 22,289 |
| Perry County | 441 | Pinckneyville | 1827 | 23,094 |
| Shelby County | 759 | Shelbyville | 1827 | 22,893 |
| Tazewell County | 649 | Pekin | 1827 | 128,485 |
| Macon County | 581 | Decatur | 1829 | 114,706 |
| Macoupin County | 864 | Carlinville | 1829 | 49,019 |
| Coles County | 508 | Charleston | 1830 | 53,196 |
| McLean County | 1,184 | Bloomington | 1830 | 150,433 |
| Cook County | 946 | Chicago | 1831 | 5,376,741 |
| Effingham County | 479 | Effingham | 1831 | 34,264 |
| Jasper County | 494 | Newton | 1831 | 10,117 |
| LaSalle County | 1,135 | Ottawa | 1831 | 111,509 |
| Rock Island County | 427 | Rock Island | 1831 | 149,374 |
| Champaign County | 997 | Urbana | 1833 | 179,669 |
| Iroquois County | 1,116 | Watseka | 1833 | 31,334 |
| Kane County | 521 | Geneva | 1836 | 404,119 |
| McHenry County | 604 | Woodstock | 1836 | 260,077 |
| Ogle County | 759 | Oregon | 1836 | 51,032 |
| Whiteside County | 685 | Morrison | 1836 | 60,653 |
| Will County | 837 | Joliet | 1836 | 502,266 |
| Winnebago County | 514 | Rockford | 1836 | 278,418 |
| Boone County | 281 | Belvidere | 1837 | 41,786 |
| Bureau County | 869 | Princeton | 1837 | 35,503 |
| Cass County | 376 | Virginia | 1837 | 13,695 |
| DeKalb County | 634 | Sycamore | 1837 | 88,969 |
| Livingston County | 1,044 | Pontiac | 1837 | 39,678 |
| Stephenson County | 564 | Freeport | 1837 | 48,979 |
| Brown County | 306 | Mount Sterling | 1839 | 6,950 |
| Carroll County | 444 | Mount Carroll | 1839 | 16,674 |
| Christian County | 709 | Taylorville | 1839 | 35,372 |
| DeWitt County | 398 | Clinton | 1839 | 16,798 |
| Hardin County | 178 | Elizabethtown | 1839 | 4,800 |
| Jersey County | 369 | Jerseyville | 1839 | 21,668 |
| Lake County | 448 | Waukegan | 1839 | 644,356 |
| Lee County | 725 | Dixon | 1839 | 36,062 |
| Logan County | 618 | Lincoln | 1839 | 31,183 |
| Marshall County | 386 | Lacon | 1839 | 13,180 |
| Menard County | 314 | Petersburg | 1839 | 12,486 |
| Scott County | 251 | Winchester | 1839 | 5,537 |
| Stark County | 288 | Toulon | 1839 | 6,332 |
| Williamson County | 424 | Marion | 1839 | 61,296 |
| Grundy County | 420 | Morris | 1841 | 37,535 |
| Henderson County | 379 | Oquawka | 1841 | 8,213 |
| Kendall County | 321 | Yorkville | 1841 | 54,544 |
| Mason County | 539 | Havana | 1841 | 16,038 |
| Piatt County | 440 | Monticello | 1841 | 16,365 |
| Richland County | 360 | Olney | 1841 | 16,149 |
| Woodford County | 528 | Eureka | 1841 | 35,469 |
| Cumberland County | 346 | Toledo | 1843 | 11,253 |
| Massac County | 239 | Metropolis | 1843 | 15,161 |
| Moultrie County | 336 | Sullivan | 1843 | 14,287 |
| Pulaski County | 201 | Mound City | 1843 | 7,348 |
| Saline County | 383 | Harrisburg | 1847 | 26,733 |
| Kankakee County | 678 | Kankakee | 1853 | 103,833 |
| Douglas County | 417 | Tuscola | 1859 | 19,922 |
| Ford County | 486 | Paxton | 1859 | 14,241 |
| DuPage County | 334 | Wheaton | 1939 | 904,161 |
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Source: United States Census Bureau, http://www.census.gov, September 5, 2006.
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About Counties: Overview of counties from the National Association of Counties. History of County Government: Three-part history of county government in the United States from the National Association of Counties. Illinois Association of County Board Members and Commissioners: To enhance the stature, role and responsiveness of county government in the State of Illinois.. The American Counties: Origins of County Names, Dates of Creation, and Population Data, 1950-2000, by Joseph Nathan Cane and updated by by Charles Curry Aiken. Purchase the premiere guide to information on the histories of the names, sizes, and populations of the counties of the United States. Scarecrow Press; 5th edition (December 28, 2004) 560 pages. County Name Origins of the United States by Michael A. Beatty. This thorough and carefully prepared work is recommended for medium to large academic and public libraries. McFarland & Company (May 2001) 665 pages. |
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