LOUISIANA: Click this link to see all slave labor sites in the state.
- Statehood: 1812; some parishes were established before Louisiana became a state
- PARISHES: Click one of the parishes below to see all plantations/ workplaces in that county.
| County | Year Est. | Details |
| Ascension | 1807 | Formed from the Louisiana territory |
| Assumption | 1807 | Formed from the Louisiana territory |
| Attakapas County | 1805 | Formed from the Louisiana territory, and split into St. Martin and St. Mary Parishes in 1811 |
| Avoyelles | 1807 | Formed from the Louisiana territory |
| Baton Rouge | 1792 | Formed from the West Florida territory, and split into East and West Baton Rouge Parihes in 1810 |
| Bienville | 1848 | Formed from Claiborne Parish |
| Bossier | 1843 | Formed from Claiborne Parish |
| Caddo | 1838 | Formed from Natchitoches Parish |
| Calcasieu | 1840 | Formed from St. Landry Parish |
| Caldwell | 1838 | Formed from Catahoula and Ouachita Parishes |
| Carroll | 1832 | Formed from Ouachita Parish, and split into East and West Carroll Parishes in 1877 |
| Catahoula | 1808 | Formed from Ouachita and Rapides Parishes |
| Claiborne | 1828 | Formed from Natchitoches Parish |
| Concordia | 1807 | Formed from the Louisiana territory |
| De Soto | 1843 | Formed from Caddo and Natchitoches Parishes |
| East Baton Rouge | 1810 | Formed from Baton Rouge Parish |
| East Feliciana | 1824 | Formed from Feliciana Parish |
| Franklin | 1843 | Formed from Carroll, Catahoula, Madison and Ouachita Parishes |
| Iberville | 1807 | Formed from the Louisiana territory |
| Jackson | 1845 | Formed from Natchitoches and Ouachita Parishes |
| Jefferson | 1825 | Formed from Orleans Parish |
| Lafayette | 1823 | Formed from St. Martin Parish |
| Lafourche | 1807 | Formed from the Louisiana territory |
| Livingston | 1832 | Formed from St. Helena Parish |
| Madison | 1838 | Formed from Concordia and Ouachita Parishes |
| Morehouse | 1844 | Formed from Ouachita and Catahoula Parishes |
| Natchitoches | 1807 | Formed from the Louisiana territory |
| Orleans | 1805 | Formed from the Louisiana territory |
| Ouachita | 1807 | Formed from the Louisiana territory |
| Plaquemines | 1807 | Formed from the Louisiana territory |
| Pointe Coupee | 1807 | Formed from the Louisiana territory |
| Rapides | 1807 | Formed from the Louisiana territory |
| Sabine | 1843 | Formed from Natchitoches Parish |
| St. Bernard | 1807 | Formed from the Louisiana territory |
| St. Charles | 1807 | Formed from the Louisiana territory |
| St. Helena | 1811 | Formed from the West Florida territory |
| St. James | 1807 | Formed from the Louisiana territory |
| St. John The Baptist | 1807 | Formed from the Louisiana territory |
| St. Landry | 1805 | Formed from the Louisiana territory |
| St. Martin | 1811 | Formed from Attakapas County |
| St. Mary | 1811 | Formed from Attakapas County |
| St. Tammany | 1810 | Formed from the West Florida territory |
| Tensas | 1861 | Formed from Madison and Concordia Parishes |
| Terrebonne | 1822 | Formed from Lafourche Parish |
| Union | 1839 | Formed from Ouachita Parish |
| Vermillion | 1844 | Formed from Lafayette Parish (Attakapas County) |
| Washington | 1819 | Formed from St. Tammany Parish |
| West Baton Rouge | 1810 | Formed from Baton Rouge Parish |
| West Feliciana | 1824 | Formed from Feliciana Parish |
| Winn | 1852 | Formed from Catahoula, Natchitoches and Rapides Parishes |
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