| Duncan to Rosemont (California) | 1,326.07 mi (2,134.10 km) |
| Duncan to Rosemount (Minnesota) | 750.61 mi (1,207.99 km) |
| Duncan to Rosenberg (Texas) | 366.35 mi (589.58 km) |
| Duncan to Roseville (California) | 1,325.52 mi (2,133.23 km) |
| Duncan to Roseville (Michigan) | 977.01 mi (1,572.34 km) |
| Duncan to Roseville (Minnesota) | 766.35 mi (1,233.32 km) |
| Duncan to Rossmoor (California) | 1,151.73 mi (1,853.54 km) |
| Duncan to Rossville (Maryland) | 1,226.67 mi (1,974.13 km) |
| Duncan to Roswell (Georgia) | 774.84 mi (1,246.99 km) |
| Duncan to Roswell (New Mexico) | 387.12 mi (623.01 km) |
| Duncan to Round Lake (Illinois) | 755.83 mi (1,216.38 km) |
| Duncan to Round Lake Beach (Illinois) | 758.42 mi (1,220.56 km) |
| Duncan to Round Rock (Texas) | 277.73 mi (446.96 km) |
| Duncan to Rowland Heights (California) | 1,139.25 mi (1,833.44 km) |
| Duncan to Rowlett (Texas) | 137.23 mi (220.84 km) |
