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