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Township/County Lookup ** ILGW References Project ** |
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| County | Date of Formation |
Parent County | County Seat | County Coordinators |
| Unknown | . | . | . | Karima Allison |
| Adams | 1825 | Pike | Quincy | Linda Lee |
| Alexander | 1819 | Union | Cairo | Angela DiBlasi & Tim Casey |
| Bond | 1818 | Madison | Greenville | Michael Hubbard |
| Boone | 1836 | Winnebago | Belvidere | Katy Hestand |
| Brown | 1837 | Schuyler | Mount Sterling | Ken & Laurie Huffman |
| Bureau | 1837 | Putnam | Princeton | Susie Martin-Rott |
| Calhoun |
1825 | Pike | Hardin | Lee Dickson |
| Carroll | 1839 | Jo Daviess | Mount Carroll | Colleen Frank |
| Cass | 1837 | Morgan | Virginia | Michelle Bley |
| Champaign | 1833 | Vermilion | Urbana | Celia Snyder |
| Christian | 1839 | Dane (Montgomery, Sangamon, Shelby) | Taylorville | Morgan Edward Johnson |
| Clark | 1819 | Crawford | Marshall | Fred Finkbiner |
| Clay | 1824 | Crawford, Fayette, Wayne | Louisville | Dianna Williams |
| Clinton | 1824 | Bond, Washington | Carlyle | Frankie Heinzmann & Dorothy Falk |
| Coles | 1830 | Clark, Edgar | Charleston | Linda Lang |
| Cook | 1831 | Putnam | Chicago | Kim Kasprzyk |
| Crawford |
1816 * | Edwards (IT) | Robinson | Angela DiBlasi |
| Cumberland | 1843 | Coles | Toledo | Michael L. Hébert |
| Dane | 1839 | Montgomery, Sangamon, Shelby | Extinct - 1840 Now Christian |
See Christian County |
| DeKalb | 1837 | Kane | Sycamore | Sheri Baker |
| DeWitt | 1839 | Macon, McLean | Clinton | Judy Simpson |
| Douglas | 1859 | Coles | Tuscola | Linda Lang |
| DuPage | 1839 | Cook | Wheaton | Jeffrey Bockman & DuPage Co. Genealogical Soc. |
| Edgar | 1823 | Clark | Paris | Joy Fisher & Maggie Stewart |
| Edwards | 1814* | Gallatin, Madison (IT) | Albion | Adopt Me! |
| Effingham | 1831 | Crawford, Fayette | Effingham | Linda Kralman-Lambert |
| Fayette | 1821 | Bond, Clark, Crawford, Jefferson | Vandalia | Penny Lewis |
| Ford | 1859 | unorganized (Vermilion) | Paxton | Adopt Me! |
| Franklin | 1818* | Gallatin, White | Benton | Lynne Johnston Westra |
| Fulton | 1823 | Pike | Lewistown | Adopt Me! |
| Gallatin | 1812* | Randolph (IT) | Shawneetown | Jon Musgrave |
| Greene | 1821 | Madison | Carrollton | Marty Crull |
| Grundy | 1841 | LaSalle | Morris | Deb Haines |
| Hamilton | 1821 | White | McLeansboro | Michael L. Hébert |
| Hancock | 1825 | Pike | Carthage | Susan Cheney |
| Hardin | 1839 | Gallatin, Pope | Elizabethtown | Jon Musgrave |
| Henderson | 1841 | Warren | Oquawka | Adopt Me! |
| Henry | 1825 | unorganized (Fulton) | Cambridge | Susie Martin-Rott |
| Iroquois | 1833 | unorganized (Vermilion) | Watseka | Adopt Me! |
| Jackson | 1816* | Johnson, Randolph | Murphysboro | Barbara Freeman |
| Jasper | 1831 | Clay, Crawford | Newton | Linda Lambert |
| Jefferson | 1819 | Edwards, White | Mt. Vernon | Cindy Ford |
| Jersey | 1839 | Greene | Jerseyville | Judy Griffin |
| JoDaviess | 1827 | Henry, Putnam | Galena | Karlene Nesbitt White & Colleen Frank |
| Johnson | 1812* | Randolph (IT) | Vienna | Tim Casey |
| Kane | 1836 | unorganized (LaSalle), Cook | Geneva | Marcia Holpuch |
| Kankakee | 1853 | Ford, Iroquois, Will | Kankakee | Lee Hollenbeck |
| Kendall | 1841 | LaSalle, Kane | Yorkville | Elmer Dickson |
| Knox | 1825 | unorganized (Fulton), Fulton, Henry | Galesburg | Pat Thomas |
| Knox | * | Northwest Territory | extinct | See Knox Above |
| Lake | 1839 | McHenry | Waukegan | Debbie Mieszala, Allen Elias & Lake Co IL Gen Soc |
| LaSalle | 1831 | Putnam, unorganized (Tazewell) | Ottawa | Annette Liptak |
| Lawrence | 1821 | Crawford, Edwards | Lawrenceville | Laurel Treat & Allison Mushrush |
| Lee | 1839 | Ogle | Dixon | Gordon Johnson & Lee County Genealogical Society |
| Livingston | 1837 | LaSalle, McLean, unorganized (Vermilion?) | Pontiac | Annette Liptak |
| Logan | 1839 | McLean, Sangamon, Tazewell | Lincoln | Cheryl Rothwell |
| Macon | 1829 | unorganized (Shelby) | Decatur | Gayle Pace Jones |
| Macoupin | 1829 | unorganized (Greene), Madison | Carlinville | Gloria Frazier & Kathleen Mirabella |
| Madison | 1812* | St. Clair (IT) | Edwardsville | Bev Bauser |
| Marion | 1823 | Fayette, Jefferson | Salem | Kim Randolph |
| Marshall | 1839 | Putnam, LaSalle | Lacon | Rick Elgin |
| Mason | 1841 | Menard, Tazewell | Havana | Jeanne Weaver |
| Massac | 1843 | Johnson, Pope | Metropolis | Barbara Freeman |
| McDonough | 1826 | Schuyler | Macomb | Melissa Calhoun |
| McHenry | 1836 | Cook, unorganized (LaSalle) | Woodstock | Joe Markovich |
| McLean | 1830 | Tazewell, unorganized (Tazewell) | Bloomington | Carol Genung |
| Menard | 1839 | Sangamon | Petersburg | Jeanne Weaver |
| Mercer | 1825 | unorganized (Pike) | Aledo | Jenny Bethurem |
| Monroe | 1816* | Randolph, St. Clair | Waterloo | Sharon Hackworth |
| Montgomery | 1821 | Bond, Madison | Hillsboro | Tim Casey |
| Morgan | 1823 | unorganized (Greene), Sangamon | Jacksonville | Linda Lee |
| Moultrie | 1843 | Macon, Shelby | Sullivan | Greg Hamblin |
| Ogle | 1836 | Jo Daviess, unorganized (LaSalle) | Oregon | Roger Cramer |
| Peoria | 1825 | Fulton, unorganized (Fulton) | Peoria | Adopt Me! |
| Perry | 1827 | Jackson, Randolph | Pickneyville | Wayne Hinton |
| Piatt | 1841 | DeWitt, Macon | Monticello | Richard Howland |
| Pike | 1821 | Madison | Pittsfield | Barbara Freeman |
| Pope | 1816* | Gallatin, Johnson | Golconda | Ginger Hayes |
| Pulaski | 1843 | Alexander, Johnson | Mound City | Angela DiBlasi |
| Putnam | 1825 | unorganized (Edgar, Fulton) | Hennepin | Adopt Me! |
| Randolph | 1795* | St. Clair, Northwest Territory | Chester | Sharon Hackworth |
| Richland | 1841 | Clay, Lawrence | Olney | Scott Burow |
| Rock Island | 1831 | Jo Daviess | Rock Island | Adopt Me! |
| Saline | 1847 | Gallatin | Harrisburg | Jon Musgrave |
| Sangamon | 1821 | Bond, Madison | Springfield | Cheryl Rothwell |
| Schuyler | 1825 | Pike, unorganized (Pike) | Rushville | Paul Pettit |
| Scott | 1839 | Morgan | Winchester | Mike St. Clair |
| Shelby | 1827 | Fayette | Shelbyville | Tim Casey & Sue Tolbert |
| Stark | 1839 | Knox, Putnam | Toulon | Adopt Me! |
| St. Clair | 1790* | Northwest Territory | Belleville | Diane Walsh |
| Stephenson | 1837 | Jo Daviess, Winnebago | Freeport | Karen Smith-Schottenbauer |
| Tazewell | 1827 | unorganized (Peoria), Fayette | Pekin | Gail Meyer Kilgore |
| Union | 1818 * | Johnson, Jackson | Jonesboro | Tim Casey |
| Vermilion | 1826 | unorganized (Edgar) | Danville | Kristie Setser |
| Wabash | 1824 | Edwards | Mount Carmel | Adopt Me! |
| Warren | 1825 | unorganized (Pike) | Monmouth | Kathleen Calkin |
| Washington | 1818* | St. Clair | Nashville | Wayne Hinton |
| Wayne | 1819 | Edwards | Fairfield | Dianna Williams |
| White | 1815* | Madison (IT) | Carmi | Cindy Birk-Conley |
| Whiteside | 1836 | Jo Daviess, Henry | Morrison | Orvill Paller |
| Will | 1836 | Cook, Iroquois | Joliet | Deb Haines |
| Williamson | 1839 | Franklin | Marion | Angela Place |
| Winnebago | 1836 | JoDaviess, unorganized (LaSalle) | Rockford | Katy Hestand |
| Woodford | 1841 | McLean, Tazewell | Eureka | Carol Genung |
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DEFINITIONS: *county formed before Illinois became a state (IT) Illinois Territory |
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The ILGenWeb ProjectDeb Haines, State Coordinator Morgan Johnson, Asst. State Coordinator Cheryl Rothwell, Asst. State Coordinator Mike Hébert, Director of Network Operations (aka The IT Guy)  The 1790 IL Map used in the banner courtesy of Michael L. Hébert, ILGenWeb Cumberland County Coordinator. |
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