Westlake is a city in Calcasieu Parish, in western Louisiana, United States, and is part of the Lake Charles Metropolitan Statistical Area. The population was 4,568 at the 2010 census. Westlake was incorporated in 1945.
Westlake is located in east-central Calcasieu Parish at 30°14′54″N 93°15′33″W (30.248455, -93.259047), on the west bank of the Calcasieu River, just north of that river's entry into the water body of Lake Charles. The city of Lake Charles borders Westlake across the river, connected via the Interstate 10 bridge.
According to the United States Census Bureau, Westlake has a total area of 3.71 square miles (9.60 km2), of which 3.65 square miles (9.46 km2) is land and 0.05 square miles (0.14 km2), or 1.49%, is water.
Moss Bluff is just to the northeast. Sulphur is to the west, after the small community of Mossville.
As of the census of 2010, there were 4,568 people, 1,805 households, and 1,326 families residing in the city. The population density was 1,988.3 people per square mile (766.9/km²). There were 1,936 housing units at an average density of 824.6 per square mile (318.1/km²).