The following highways are numbered 324:
Brazil BR-324
Canada Nova Scotia Route 324 Saskatchewan Highway 324
China China National Highway 324
Costa Rica National Route 324
Japan Japan National Route 324
United States Arkansas Highway 324 Georgia State Route 324 Louisiana Highway 324 Maryland Route 324 (unsigned) Minnesota State Highway 324 (former) New Jersey Route 324 New York: New York State Route 324 County Route 324 (Erie County, New York) Ohio State Route 324 Pennsylvania Route 324 Puerto Rico Highway 324 South Carolina Highway 324 South Dakota Highway 324 Texas State Highway 324 (former) Virginia State Route 324 Virginia State Route 324 (former) Montana Highway 324