The route was originally designated as Route S39 in 1941, a spur of Route 39 (present-day US 206) that was to provide improved access to Fort Dix during World War II. In 1953, Route S39 became Route 68 and it was legislated to extend south of Fort Dix to the Four Mile Circle with Route 70 and Route 72. A freeway for Route 68 was proposed to run between a planned Route 38 freeway and the Four Mile Circle in 1960; however, it was never built.