1850 Parishes of Louisiana
| Parish | Description | Area in sq miles | Courts held at | Pop in 1850 |
| Ascension | southeast part, crossed by Mississippi river | blank | Donaldsonville | 10,752 |
| Assumption | southeast part, water by Mississippi river & Bayou La Fourche | blank | Assumption | 10,538 |
| Avoyelles | west side of the Mississippi river, water by Atchafalaya & Red Rivers | 1,080 | Marksville | 3,326 |
| Bienville | NW part, on east side of Lake Bisteneau | blank | blank | 5,539 |
| Bossier | NW corner, between Red river & lake Bisteneau, also lake Bodeau | 880 | Belleview | 6,962 |
| Caddo | northwest corner, on western side of Red river & water by Caddo lake | 2,500 | Shrewsport (Shreveport) | 8,864 |
| Calcasieu | southwestern corner, on east side of Sabine river &Gulf of Mexico on the south | 5,000 | Lisbon | 3,914 |
| Caldwell | north part, crossed by Wachita river | blank | Columbia | 2,815 |
| Carroll | northeast corner, on west side of Mississippi river | 1100 | Providence | 8,789 |
| Cataholla | eastern part, water by Catahoola lake, Catahoola & Washita rivers | 2,100 | Harrisonburgh | 6,982 |
| Claiborne | northern boundary, on east side of Bayou Dorchest | blank | Oveston | 7,471 |
| Concordia | east boundary, between Tensas & Mississippi rivers | 1300 | Vidalia | 7,758 |
| De Soto | western boundary, Sabine river on west | blank | Mansfield | 8,019 |
| East Baton Rouge | southeastern part, Mississippi river on west | blank | Baton Rouge | 11,977 |
| East Feliciana | northern boundary, lies on east side of Mississippi river | 560 | Clinton | 13,298 |
| Feliciana | see East & West Feliciana | |||
| Franklin | north eastern part | blank | Winnisborough | 3,251 |
| Iberville | south eastern part, crossed by Mississippi river | 350 | Plaquemine | 12,216 |
| Jackson | northern part | blank | blank | 5,566 |
| Jefferson | south eastern part, crossed by Mississippi river, bounded by bayous & inlets of Gulf of Mexico | 720 | La Fayette | 25,091 |
| Lafayette | southern part, crossed by Vermillion river | blank | Vermillionville | 6,720 |
| La Fourche Interior | southeast part, Gulf of Mexico on south | 1100 | Thibodeauxville | 9,533 |
| Livingston | toward southeast part | 730 | Springfield | 3,385 |
| Madison | east boundary, Mississippi river on east | 800 | Richmond | 7,863 |
| Morehouse | north boundary, Wachita river on west | blank | Bastrop | 3,913 |
| Natchitoches | western part, crossed by Red river | 4000 | Natchitoches | 14,201 |
| Orleans | southeast part, Lake Pontchartrain on northwest, Lake Borgne on southeast, Mississippi river on southwest | 160 | New Orleans | 119,461 |
| Plaquemine | southeast extremity on the Gulf of Mexico, including the main embouchure of the Mississippi river | 2500 | Fort Jackson | 7,390 |
| Point Coupee | in central part, Mississippi river on northeast & Atchafalaya on west | 600 | Point Coupee | 11,339 |
| Rapides | toward western part, crossed by Red river | 600 | Alexandria | 16,561 |
| Sabine | western boundary, Sabine river on west | blank | Manny | 4,515 |
| St Bernard | southeast part, Mississippi river on northwest, surrounded by Gulf of Mexico | 150 | blank | 3,802 |
| St Charles | in southeast part, Lake Pontchartrain on north, crossed by Mississippi river | 512 | St Charles Court House | 5,120 |
| St Helena | on north boundary of southeast section | 1700 | Greensburgh | 4,561 |
| St John Baptist | southeast part, Lakes Maurepas & Ponchartrain on northeast & east, Lake Allemande on south & crossed by Mississippi river | 260 | St John Baptist Court House | 7,317 |
| St Landre | toward southern part, Atchafalaya river on east | 2000 | Opelousas | 22,353 |
| St Martin's | toward southern part, Chetimaches lake on south | 850 | St Martinsville | 11,765 |
| St Mary's | on south boundary, Gulf of Mexico on south, Chetimaches lake on northeast | 870 | Franklin | 13,700 |
| St Tammany | on east boundary, Pearl river on east, Lake Ponchartrain on south | 972 | Covington | 6,364 |
| Tensas | east boundary, Mississippi river on east, Tensas river on west | blank | St Joseph | 8,940 |
| Terre Bonne | in southern part, on the Gulf of Mexico | 1850 | Houma | 7,724 |
| Union | on northern boundary, Wachita river on east | 1200 | Farmersville | 8,203 |
| Wachita | in northern part, crossed by Wachita river | 2090 | Monroe | 5,308 |
| Washington | on northern boundary, Pearl river on east | 792 | Franklinton | 3,408 |
| West Baton Rouge | central part, Mississippi river on east, Red river on west | 700 | West Baton Rouge | 6,270 |
| West Feliciana | on northern boundary, Mississippi river on southwest | 600 | St Francisville | 13,245 |