MISSOURI: Click this link to see all slave labor sites in the state.
- Statehood: 1821; some counties were established before Missouri became a state
- COUNTIES: Click one of the counties below to see all plantations/ workplaces in that county.
| County | Year Est. | Details |
| Adair | 1841 | from Macon County |
| Andrew | 1841 | from part of the Platte Purchase |
| Atchison | 1843 | from Holt County, part of the Platte Purchase |
| Audrain | 1831 | from Callaway, Monroe and Ralls counties |
| Barry | 1835 | from Greene County |
| Barton | 1855 | from Jasper County |
| Bates | 1841 | from Van Buren (now Cass) County |
| Benton | 1835 | from Pettis and Greene counties |
| Bollinger | 1851 | from Cape Girardeau, Madison, Stoddard, and Wayne counties |
| Boone | 1820 | from Howard County |
| Buchanan | 1838 | from part of the Platte Purchase |
| Butler | 1849 | from Wayne County |
| Caldwell | 1836 | from Ray County |
| Callaway | 1821 | from Boone, Howard, and Montgomery counties |
| Camden | 1841 | from Benton, Morgan, and Pulaski counties |
| Cape Girardeau | 1812 | one of the five original counties |
| Carroll | 1833 | from Ray County |
| Carter | 1859 | from Oregon, Reynolds, Ripley, and Shannon counties |
| Cass | 1833 | from Jackson County |
| Cedar | 1845 | from Dade and St. Clair counties |
| Chariton | 1821 | from Howard County |
| Christian | 1859 | from Greene, Taney and Webster counties |
| Clark | 1836 | from Lewis County |
| Clay | 1822 | from Ray County |
| Clinton | 1833 | from Clay County |
| Cole | 1820 | from Cooper County |
| Cooper | 1818 | from Howard County |
| Crawford | 1829 | from Gasconade County |
| Dade | 1841 | from Barry and Polk counties |
| Dallas | 1841 | from Polk County |
| Daviess | 1836 | from Ray County |
| DeKalb | 1843 | from Clinton County |
| Dent | 1851 | from Crawford and Shannon counties |
| Douglas | 1857 | from Ozark County |
| Dunklin | 1843 | from Stoddard County |
| Franklin | 1818 | from St. Louis County |
| Gasconade | 1821 | from Franklin County |
| Gentry | 1841 | from Clinton County |
| Greene | 1833 | from Crawford and Wayne counties |
| Grundy | 1839 | from Livingston County |
| Harrison | 1843 | from Daviess County |
| Henry | 1834 | from Lillard (now Lafayette) County |
| Hickory | 1845 | from Benton and Polk counties |
| Holt | 1841 | from Part of the Platte Purchase |
| Howard | 1816 | from St. Charles and St. Louis counties |
| Howell | 1857 | from Oregon County |
| Iron | 1857 | from Madison, Reynolds, St. Francois, Washington and Wayne counties |
| Jackson | 1826 | from Lillard (now Lafayette) County |
| Jasper | 1841 | from Barry County |
| Jefferson | 1818 | from St. Louis and Sainte Genevieve counties |
| Johnson | 1834 | from Lillard (now Lafayette) County |
| Knox | 1843 | from Scotland County |
| Laclede | 1849 | from Camden, Pulaski, and Wright counties |
| Lafayette | 1821 | from Cooper County |
| Lawrence | 1843 | from Barry and Dade counties |
| Lewis | 1833 | from Marion County |
| Lincoln | 1818 | from St. Charles County |
| Linn | 1837 | from Chariton County |
| Livingston | 1837 | from Carroll County |
| Macon | 1837 | from Chariton and Randolph counties |
| Madison | 1818 | from Cape Girardeau and Sainte Genevieve counties |
| Maries | 1855 | from Osage and Pulaski counties |
| Marion | 1826 | from Ralls County |
| McDonald | 1847 | from Newton County |
| Mercer | 1845 | from Grundy County |
| Miller | 1837 | from Cole and Pulaski counties |
| Mississippi | 1842 | from Scott County |
| Moniteau | 1845 | from Cole and Morgan counties |
| Monroe | 1831 | from Ralls County |
| Montgomery | 1818 | from St. Charles County |
| Morgan | 1833 | from Cooper County |
| New Madrid | 1812 | one of the five original counties |
| Newton | 1838 | from Barry County |
| Nodaway | 1843 | from Andrew County, the Platte Purchase |
| Oregon | 1841 | from Ripley County |
| Osage | 1841 | from Gasconade County |
| Ozark | 1841 | from Taney County |
| Pemiscot | 1851 | from New Madrid County |
| Perry | 1821 | from Sainte Genevieve County |
| Pettis | 1833 | from Cooper and Saline counties |
| Phelps | 1857 | from Crawford County |
| Pike | 1818 | from St. Charles County |
| Platte | 1838 | from Part of the Platte Purchase |
| Polk | 1835 | from Greene County |
| Pulaski | 1833 | from Crawford County |
| Putnam | 1843 | from Adair and Sullivan counties |
| Ralls | 1821 | from Pike County |
| Randolph | 1829 | from Chariton and Ralls counties |
| Ray | 1820 | from Howard County |
| Reynolds | 1845 | from Shannon County |
| Ripley | 1831 | from Wayne County |
| Saint Charles | 1812 | one of the five original counties |
| Saint Clair | 1841 | from Rives (now Henry) County |
| Saint Francois | 1821 | from Jefferson, Ste. Genevieve, and Washington counties |
| Saint Louis City | 1876 | from St. Louis County in 1876 when city residents voted to secede from the county |
| Saint Louis | 1812 | one of the five original counties |
| Saline | 1820 | from Cooper County |
| Schuyler | 1843 | from Adair County |
| Scotland | 1841 | from Clark, Lewis, and Shelby counties |
| Scott | 1822 | from New Madrid County |
| Shannon | 1837 | from Ripley County |
| Shelby | 1835 | from Marion County |
| Ste. Genevieve | 1812 | one of the five original counties |
| Stoddard | 1835 | from New Madrid County |
| Stone | 1851 | from Taney County |
| Sullivan | 1843 | from Linn County |
| Taney | 1837 | from Greene County |
| Texas | 1843 | from Shannon and Wright counties |
| Vernon | 1851 | from Bates County |
| Warren | 1833 | from Montgomery County |
| Washington | 1813 | from Sainte Genevieve County |
| Wayne | 1818 | from Cape Girardeau and Lawrence counties |
| Webster | 1855 | from Greene County |
| Worth | 1861 | from Gentry County |
| Wright | 1841 | from Pulaski County |
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