Belle Chasse is a census-designated place in Plaquemines Parish, Louisiana, United States, on the West Bank of the Mississippi River. Belle Chasse is part of the Greater New Orleans Metropolitan area. The population was 12,679 at the 2010 census.Belle Chasse is the largest town in Plaquemines Parish.Belle Chasse is home to Naval Air Station Joint Reserve Base New Orleans, a Naval Air Station for the U.S. Navy Reserve.