| Duluth to Ridgeland (Mississippi) | 997.19 mi (1,604.82 km) |
| Duluth to Ridgewood (New Jersey) | 980.02 mi (1,577.19 km) |
| Duluth to Rifle (Colorado) | 930.75 mi (1,497.90 km) |
| Duluth to Rincon (Georgia) | 1,154.46 mi (1,857.92 km) |
| Duluth to Ringwood (New Jersey) | 968.40 mi (1,558.50 km) |
| Duluth to Río Grande (Puerto Rico) | 2,464.50 mi (3,966.23 km) |
| Duluth to Rio Grande City (Texas) | 1,455.75 mi (2,342.81 km) |
| Duluth to Rio Linda (California) | 1,577.47 mi (2,538.70 km) |
| Duluth to Rio Rancho (New Mexico) | 1,094.62 mi (1,761.62 km) |
| Duluth to Rio Rico (Arizona) | 1,453.69 mi (2,339.48 km) |
| Duluth to Ripon (California) | 1,596.96 mi (2,570.07 km) |
| Duluth to River Edge (New Jersey) | 985.28 mi (1,585.65 km) |
| Duluth to River Falls (Wisconsin) | 134.34 mi (216.20 km) |
| Duluth to River Forest (Illinois) | 398.97 mi (642.08 km) |
| Duluth to River Grove (Illinois) | 396.74 mi (638.50 km) |
