Former Parishes
- Biloxi Parish formed in 1811 from West Florida territory. It was eliminated in 1812 when part of the former West Florida area was transferred to Mississippi Territory.
- Carroll Parish formed in 1838 from part of Ouachita Parish. In 1877, it was divided into East Carroll Parish and West Carroll Parish.
- Feliciana Parish formed in 1810 from West Florida territory. In 1824, it was divided into East Feliciana Parish and West Feliciana Parish.
- Pascagoula Parish formed in 1811 from West Florida territory. It was eliminated in 1812 when part of the former West Florida area was transferred to Mississippi Territory.
- Warren Parish formed in 1811 from part of Concordia Parish, and merged into Concordia Parish and Ouachita Parish in 1814.
Read more about this topic: List Of Former United States Counties, Louisiana