| Duluth to Red Bank (New Jersey) | 1,004.74 mi (1,616.97 km) |
| Duluth to Red Bank (Tennessee) | 880.63 mi (1,417.24 km) |
| Duluth to Red Bluff (California) | 1,565.79 mi (2,519.90 km) |
| Duluth to Red Hill (South Carolina) | 1,130.51 mi (1,819.38 km) |
| Duluth to Red Oak (Texas) | 1,014.96 mi (1,633.42 km) |
| Duluth to Red Wing (Minnesota) | 153.23 mi (246.60 km) |
| Duluth to Redan (Georgia) | 992.76 mi (1,597.70 km) |
| Duluth to Redding (California) | 1,559.40 mi (2,509.61 km) |
| Duluth to Redland (Maryland) | 921.41 mi (1,482.87 km) |
| Duluth to Redlands (California) | 1,572.46 mi (2,530.63 km) |
| Duluth to Redmond (Oregon) | 1,408.52 mi (2,266.79 km) |
| Duluth to Redmond (Washington) | 1,399.19 mi (2,251.77 km) |
| Duluth to Redondo Beach (California) | 1,633.23 mi (2,628.43 km) |
| Duluth to Redwood City (California) | 1,656.42 mi (2,665.74 km) |
| Duluth to Reedley (California) | 1,563.76 mi (2,516.62 km) |
