List of highways numbered 320
The following highways are numbered 320:
Canada
- Newfoundland and Labrador Route 320
- Nova Scotia Route 320
- Saskatchewan Highway 320
China
- China National Highway 320
Costa Rica
- National Route 320
India
- National Highway 320
Japan
- Japan National Route 320
United States
- U.S. Route 320
- Arkansas Highway 320
- Connecticut Route 320
- Florida State Road 320
- * County Road 320
- Georgia State Route 320
- Hawaii Route 320
- Kentucky Route 320
- Louisiana Highway 320
- Maryland Route 320
- Montana Secondary Highway 320
- Nevada State Route 320
- New Mexico State Road 320
- New York State Route 320
- Ohio State Route 320
- Pennsylvania Route 320
- Puerto Rico Highway 320
- Tennessee State Route 320
- Texas:
- * Texas State Highway 320
- * Texas State Highway Loop 320
- * Farm to Market Road 320
- Utah State Route 320
- Virginia State Route 320
- Wyoming Highway 320