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