Fort Johnson South is a census-designated place in Vernon Parish, Louisiana, United States. The population was 11,000 at the 2000 census. 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 and DeRidder micropolitan areas, which had a combined popu…Fort Johnson South is a census-designated place in Vernon Parish, Louisiana, United States. The population was 11,000 at the 2000 census. 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 and DeRidder micropolitan areas, which had a combined population of 85,517 at the 2000 census.
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