ILLINOIS: Click this link to see all slave labor sites in the state.
- Statehood: 1818; some counties were established before Illinois became a state
- COUNTIES: Click one of the counties below to see all plantations/ workplaces in that county.
| County | Year Est. | Details |
| Adams | 1825 | from Pike County |
| Alexander | 1819 | from Union County |
| Bond | 1817 | from Crawford County, Edwards County, and Madison counties |
| Boone | 1837 | from Winnebago County |
| Brown | 1839 | from Schuyler County |
| Bureau | 1837 | from Putnam County |
| Calhoun | 1825 | from Pike County |
| Carroll | 1839 | from Jo Daviess |
| Cass | 1837 | from Morgan County |
| Champaign | 1833 | from Vermilion County |
| Christian | 1839 | from Sangamon County |
| Clark | 1819 | from Crawford County |
| Clay | 1824 | from Wayne, Lawrence, Fayette, and Crawford counties |
| Clinton | 1824 | from Washington, Bond, and Fayette counties |
| Coles | 1830 | from Clark and Edgar counties |
| Cook | 1831 | from Putnam County |
| Crawford | 1816 | from Edwards County |
| Cumberland | 1843 | from Coles County |
| DeKalb | 1837 | from Kane County |
| DeWitt | 1839 | from Macon and McLean counties |
| Douglas | 1859 | from Coles County |
| DuPage | 1839 | from Cook County |
| Edgar | 1823 | from Clark County |
| Edwards | 1814 | from Gallatin County and Madison counties |
| Effingham | 1831 | from Fayette and Crawford counties |
| Fayette | 1821 | from Bond, Wayne, Clark, Jefferson, and Crawford counties |
| Ford | 1859 | from Vermilion County |
| Franklin | 1818 | from White County and Gallatin counties |
| Fulton | 1823 | from Pike County |
| Gallatin | 1812 | from Randolph County |
| Greene | 1821 | from Madison County |
| Grundy | 1841 | from LaSalle County |
| Hamilton | 1821 | from White County |
| Hancock | 1825 | from Adams County |
| Hardin | 1839 | from Pope County |
| Henderson | 1841 | from Warren County |
| Henry | 1825 | from Fulton County |
| Iroquois | 1833 | from Vermilion County |
| Jackson | 1816 | from Randolph County and Johnson counties |
| Jasper | 1831 | from Clay and Crawford counties |
| Jefferson | 1819 | from Edwards and White counties |
| Jersey | 1839 | from Greene County |
| Jo Daviess | 1827 | from Henry, Mercer, and Putnam counties |
| Johnson | 1812 | from Randolph County |
| Kane | 1836 | from LaSalle County |
| Kankakee | 1853 | from Iroquois and Will counties |
| Kendall | 1841 | from LaSalle and Kane counties |
| Knox | 1825 | from Fulton County |
| Lake | 1839 | from McHenry County |
| LaSalle | 1831 | from Putnam and Tazewell counties |
| Lawrence | 1821 | from Crawford and Edwards counties |
| Lee | 1839 | from Ogle County |
| Livingston | 1837 | from LaSalle and McLean counties |
| Logan | 1839 | from Sangamon County |
| Macon | 1829 | from Shelby County |
| Macoupin | 1829 | from Greene County |
| Madison | 1812 | from St. Clair County and Randolph counties |
| Marion | 1823 | from Fayette and Jefferson counties |
| Marshall | 1839 | from Putnam County |
| Mason | 1841 | from Tazewell and Menard counties |
| Massac | 1843 | from Pope and Johnson counties |
| McDonough | 1826 | from Schuyler County |
| McHenry | 1836 | from Cook and LaSalle counties |
| McLean | 1830 | from Tazewell County |
| Menard | 1839 | from Sangamon County |
| Mercer | 1825 | from Schuyler County |
| Monroe | 1816 | from Randolph County and St. Clair counties |
| Montgomery | 1821 | from Bond and Madison counties |
| Morgan | 1823 | from Sangamon County |
| Moultrie | 1843 | from Shelby and Macon counties |
| Ogle | 1836 | from Jo Daviess |
| Peoria | 1825 | from Fulton County |
| Perry | 1827 | from Randolph and Jackson counties |
| Piatt | 1841 | from DeWitt and Macon County |
| Pike | 1821 | from Madison, Bond, and Clark counties |
| Pope | 1816 | from Gallatin and Johnson counties |
| Pulaski | 1843 | from Alexander and Johnson counties |
| Putnam | 1825 | from Fulton County |
| Randolph | 1795 | from St. Clair County |
| Richland | 1841 | from Clay and Lawrence counties |
| Rock Island | 1831 | from Jo Daviess County |
| Saline | 1847 | from Gallatin County |
| Sangamon | 1821 | from Madison and Bond counties |
| Schuyler | 1825 | from Pike and Fulton counties |
| Scott | 1839 | from Morgan County |
| Shelby | 1827 | from Fayette County |
| St. Clair | 1790 | from original two counties |
| Stark | 1839 | from Knox and Putnam counties |
| Stephenson | 1837 | from Jo Daviess and Winnebago counties |
| Tazewell | 1827 | from Sangamon County |
| Union | 1818 | from Johnson County |
| Vermilion | 1826 | from Edgar County |
| Wabash | 1824 | from Edwards County |
| Warren | 1825 | from Schuyler County |
| Washington | 1818 | from St. Clair County |
| Wayne | 1819 | from Edwards County |
| White | 1815 | from Gallatin County |
| Whiteside | 1836 | from Jo Daviess and Henry counties |
| Will | 1836 | from Cook and Iroquois counties |
| Williamson | 1839 | from Franklin County |
| Winnebago | 1836 | from Jo Daviess |
| Woodford | 1841 | from Tazewell and McLean counties |
Sankofagen 