Fort Johnson South is a census-designated place (CDP) in Vernon Parish, Louisiana, United States.

Fort Johnson South is the larger principal city of the Fort Johnson South-DeRidder CSA, a Combined Statistical Area that includes the Fort Johnson South (Vernon Parish) and DeRidder (Beauregard Parish) micropolitan areas,[2][3] which had a combined population of 85,517 at the 2000 census.

[5] According to the United States Census Bureau, the CDP has a total area of 6.2 square miles (16 km2), all land.

[citation needed] As of the census[4] of 2000, there were 11,000 people, 2,383 households, and 2,175 families residing in the CDP.

8.3% of all households were made up of individuals, and none had someone living alone who was 65 years of age or older.