List of LouisianaParish seats: Official language(s) English and French Capital Baton Rouge Largest city New Orleans at last census; probably Baton Rouge since Hurricane Katrina Area Ranked 31st - Total 51,885 sq mi (134,382 km²) - Width 130 miles (210 km) - Length 379 miles (610 km) - % water 16 - Latitude 29°N to 33... A county seat is a term for an administrative center for a county, primarily used in the United States. ...