| Duluth to Rockville (Maryland) | 923.29 mi (1,485.89 km) |
| Duluth to Rockville Centre (New York) | 1,012.53 mi (1,629.51 km) |
| Duluth to Rockwall (Texas) | 983.91 mi (1,583.45 km) |
| Duluth to Rocky Mount (North Carolina) | 1,050.38 mi (1,690.43 km) |
| Duluth to Rocky Point (New York) | 1,034.91 mi (1,665.52 km) |
| Duluth to Rocky River (Ohio) | 627.40 mi (1,009.71 km) |
| Duluth to Roessleville (New York) | 940.82 mi (1,514.10 km) |
| Duluth to Rogers (Arkansas) | 730.01 mi (1,174.84 km) |
| Duluth to Rogers (Minnesota) | 129.72 mi (208.76 km) |
| Duluth to Rohnert Park (California) | 1,647.85 mi (2,651.96 km) |
| Duluth to Rolla (Missouri) | 610.38 mi (982.31 km) |
| Duluth to Rolling Meadows (Illinois) | 382.90 mi (616.21 km) |
| Duluth to Roma (Texas) | 1,455.91 mi (2,343.06 km) |
| Duluth to Rome (Georgia) | 937.36 mi (1,508.53 km) |
| Duluth to Rome (New York) | 847.67 mi (1,364.19 km) |
