St. Tammany Parish

Also known as St. Tammany Parish, Louisiana, St. Tammany Parish, LA

parish in Louisiana, United States of America

Key facts

Country: United States
State: Louisiana
Founded: October 27, 1810
Named after: Indian Chief Tamanend
Seat: Covington
Largest city: Slidell
Total: 1,124 sq mi (2,910 km )
Land: 846 sq mi (2,190 km )
Water: 279 sq mi (720 km ) 25%
Estimate 2025: 279,108
Density: 312.73/sq mi (120.75/km )
Time zone: UTC−6 ( Central )
Summer dst

Article

St. Tammany Parish Justice Center in Covington Madisonville's Tchefuncte River Lighthouse stands on the Saint Tammany Northshore of Lake Pontchartrain. This lighthouse was built in 1837.

St. Tammany Parish (French: Paroisse de Saint-Tammany; Spanish: Parroquia de St. Tammany) is a parish located in the U.S. state of Louisiana named after Tamanend, the legendary Lenape Chief of Chiefs and the "Patron Saint of America." At the 2020 census, the population was 264,570, making it the fourth-most populous parish in Louisiana. The parish seat is Covington. The parish was founded in 1810.