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) |
|---|---|---|---|---|
| Adams County | 857 | Quincy | 1825 | 68,277 |
| Alexander County | 236 | Cairo | 1819 | 9,590 |
| Bond County | 380 | Greenville | 1817 | 17,633 |
| Boone County | 281 | Belvidere | 1837 | 41,786 |
| Brown County | 306 | Mount Sterling | 1839 | 6,950 |
| Bureau County | 869 | Princeton | 1837 | 35,503 |
| Calhoun County | 254 | Hardin | 1825 | 5,084 |
| Carroll County | 444 | Mount Carroll | 1839 | 16,674 |
| Cass County | 376 | Virginia | 1837 | 13,695 |
| Champaign County | 997 | Urbana | 1833 | 179,669 |
| Christian County | 709 | Taylorville | 1839 | 35,372 |
| Clark County | 502 | Marshall | 1819 | 17,008 |
| Clay County | 469 | Louisville | 1824 | 14,560 |
| Clinton County | 474 | Carlyle | 1824 | 35,535 |
| Coles County | 508 | Charleston | 1830 | 53,196 |
| Cook County | 946 | Chicago | 1831 | 5,376,741 |
| Crawford County | 444 | Robinson | 1816 | 20,452 |
| Cumberland County | 346 | Toledo | 1843 | 11,253 |
| DeKalb County | 634 | Sycamore | 1837 | 88,969 |
| DeWitt County | 398 | Clinton | 1839 | 16,798 |
| Douglas County | 417 | Tuscola | 1859 | 19,922 |
| DuPage County | 334 | Wheaton | 1939 | 904,161 |
| Edgar County | 624 | Paris | 1823 | 19,704 |
| Edwards County | 222 | Albion | 1814 | 6,971 |
| Effingham County | 479 | Effingham | 1831 | 34,264 |
| Fayette County | 716 | Vandalia | 1821 | 21,802 |
| Ford County | 486 | Paxton | 1859 | 14,241 |
| Franklin County | 412 | Benton | 1818 | 39,018 |
| Fulton County | 866 | Lewistown | 1823 | 38,250 |
| Gallatin County | 324 | Shawneetown | 1812 | 6,445 |
| Grundy County | 420 | Morris | 1841 | 37,535 |
| Hamilton County | 435 | McLeansboro | 1821 | 8,621 |
| Hancock County | 795 | Carthage | 1825 | 20,121 |
| Hardin County | 178 | Elizabethtown | 1839 | 4,800 |
| Henderson County | 379 | Oquawka | 1841 | 8,213 |
| Henry County | 823 | Cambridge | 1825 | 51,020 |
| Iroquois County | 1,116 | Watseka | 1833 | 31,334 |
| Jackson County | 588 | Murphysboro | 1816 | 59,612 |
| Jasper County | 494 | Newton | 1831 | 10,117 |
| Jefferson County | 571 | Mount Vernon | 1819 | 40,045 |
| Jersey County | 369 | Jerseyville | 1839 | 21,668 |
| Jo Daviess County | 601 | Galena | 1827 | 22,289 |
| Johnson County | 346 | Vienna | 1812 | 12,878 |
| Kane County | 521 | Geneva | 1836 | 404,119 |
| Kankakee County | 678 | Kankakee | 1853 | 103,833 |
| Kendall County | 321 | Yorkville | 1841 | 54,544 |
| Knox County | 716 | Galesburg | 1825 | 55,836 |
| Lake County | 448 | Waukegan | 1839 | 644,356 |
| LaSalle County | 1,135 | Ottawa | 1831 | 111,509 |
| Lawrence County | 372 | Lawrenceville | 1821 | 15,452 |
| Lee County | 725 | Dixon | 1839 | 36,062 |
| Livingston County | 1,044 | Pontiac | 1837 | 39,678 |
| Logan County | 618 | Lincoln | 1839 | 31,183 |
| Macon County | 581 | Decatur | 1829 | 114,706 |
| Macoupin County | 864 | Carlinville | 1829 | 49,019 |
| Madison County | 725 | Edwardsville | 1812 | 258,941 |
| Marion County | 572 | Salem | 1823 | 41,691 |
| Marshall County | 386 | Lacon | 1839 | 13,180 |
| Mason County | 539 | Havana | 1841 | 16,038 |
| Massac County | 239 | Metropolis | 1843 | 15,161 |
| McDonough County | 589 | Macomb | 1826 | 32,913 |
| McHenry County | 604 | Woodstock | 1836 | 260,077 |
| McLean County | 1,184 | Bloomington | 1830 | 150,433 |
| Menard County | 314 | Petersburg | 1839 | 12,486 |
| Mercer County | 561 | Aledo | 1825 | 16,957 |
| Monroe County | 388 | Waterloo | 1816 | 27,619 |
| Montgomery County | 704 | Hillsboro | 1821 | 30,652 |
| Morgan County | 569 | Jacksonville | 1823 | 36,616 |
| Moultrie County | 336 | Sullivan | 1843 | 14,287 |
| Ogle County | 759 | Oregon | 1836 | 51,032 |
| Peoria County | 620 | Peoria | 1825 | 183,433 |
| Perry County | 441 | Pinckneyville | 1827 | 23,094 |
| Piatt County | 440 | Monticello | 1841 | 16,365 |
| Pike County | 830 | Pittsfield | 1821 | 17,384 |
| Pope County | 371 | Golconda | 1816 | 4,413 |
| Pulaski County | 201 | Mound City | 1843 | 7,348 |
| Putnam County | 160 | Hennepin | 1825 | 6,086 |
| Randolph County | 578 | Chester | 1795 | 33,893 |
| Richland County | 360 | Olney | 1841 | 16,149 |
| Rock Island County | 427 | Rock Island | 1831 | 149,374 |
| Saline County | 383 | Harrisburg | 1847 | 26,733 |
| Sangamon County | 868 | Springfield | 1821 | 188,951 |
| Schuyler County | 437 | Rushville | 1825 | 7,189 |
| Scott County | 251 | Winchester | 1839 | 5,537 |
| Shelby County | 759 | Shelbyville | 1827 | 22,893 |
| St. Clair County | 664 | Belleville | 1790 | 256,082 |
| Stark County | 288 | Toulon | 1839 | 6,332 |
| Stephenson County | 564 | Freeport | 1837 | 48,979 |
| Tazewell County | 649 | Pekin | 1827 | 128,485 |
| Union County | 416 | Jonesboro | 1818 | 18,293 |
| Vermilion County | 899 | Danville | 1826 | 83,919 |
| Wabash County | 224 | Mount Carmel | 1824 | 12,937 |
| Warren County | 543 | Monmouth | 1825 | 18,735 |
| Washington County | 563 | Nashville | 1818 | 15,148 |
| Wayne County | 714 | Fairfield | 1819 | 17,151 |
| White County | 495 | Carmi | 1815 | 15,371 |
| Whiteside County | 685 | Morrison | 1836 | 60,653 |
| Will County | 837 | Joliet | 1836 | 502,266 |
| Williamson County | 424 | Marion | 1839 | 61,296 |
| Winnebago County | 514 | Rockford | 1836 | 278,418 |
| Woodford County | 528 | Eureka | 1841 | 35,469 |
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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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