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is a city located in Hancock County, Mississippi. It is part of the Gulfport–Biloxi, Mississippi Metropolitan Statistical Area. As of the 2000 census, the city had a total population of 8,209. It is the county seat of Hancock County. Like several other upper Gulf Coast cities, Bay Saint Louis was devastated by Hurricane Katrina in August 2005 (see details below).
Bay St. Louis is located at 30°18'53" North, 89°20'39" West (30.314696, -89.344096). It is situated on the Bay of Saint Louis, which empties into the Mississippi Sound.
According to the United States Census Bureau, the city has a total area of 16.9 square miles (43.7 km²), of which, 6.1 square miles (15.9 km²) of it is land and 10.7 square miles (27.8 km²) of it is water. The total area is 63.70% water.