| Duluth to Robertsville (New Jersey) | 994.97 mi (1,601.24 km) |
| Duluth to Robinson (Texas) | 1,091.45 mi (1,756.51 km) |
| Duluth to Robstown (Texas) | 1,345.40 mi (2,165.21 km) |
| Duluth to Rochester (Michigan) | 524.68 mi (844.40 km) |
| Duluth to Rochester (Minnesota) | 191.42 mi (308.06 km) |
| Duluth to Rochester (New Hampshire) | 1,057.21 mi (1,701.42 km) |
| Duluth to Rochester (New York) | 751.04 mi (1,208.69 km) |
| Duluth to Rochester Hills (Michigan) | 524.07 mi (843.41 km) |
| Duluth to Rock Hill (South Carolina) | 1,000.80 mi (1,610.63 km) |
| Duluth to Rock Island (Illinois) | 374.61 mi (602.87 km) |
| Duluth to Rock Springs (Wyoming) | 916.49 mi (1,474.95 km) |
| Duluth to Rockford (Illinois) | 346.79 mi (558.11 km) |
| Duluth to Rockledge (Florida) | 1,416.44 mi (2,279.54 km) |
| Duluth to Rocklin (California) | 1,564.32 mi (2,517.53 km) |
| Duluth to Rockport (Texas) | 1,322.57 mi (2,128.47 km) |
