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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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