| Potomac to Rosemont (California) | 2,354.89 mi (3,789.83 km) |
| Potomac to Rosemount (Minnesota) | 905.39 mi (1,457.08 km) |
| Potomac to Rosenberg (Texas) | 1,244.86 mi (2,003.40 km) |
| Potomac to Roseville (California) | 2,349.10 mi (3,780.51 km) |
| Potomac to Roseville (Michigan) | 385.30 mi (620.08 km) |
| Potomac to Roseville (Minnesota) | 916.05 mi (1,474.24 km) |
| Potomac to Rossmoor (California) | 2,282.85 mi (3,673.89 km) |
| Potomac to Rossville (Maryland) | 45.15 mi (72.67 km) |
| Potomac to Roswell (Georgia) | 525.10 mi (845.06 km) |
| Potomac to Roswell (New Mexico) | 1,566.74 mi (2,521.42 km) |
| Potomac to Round Lake (Illinois) | 615.71 mi (990.90 km) |
| Potomac to Round Lake Beach (Illinois) | 615.29 mi (990.21 km) |
| Potomac to Round Rock (Texas) | 1,297.26 mi (2,087.73 km) |
| Potomac to Rowland Heights (California) | 2,268.20 mi (3,650.31 km) |
| Potomac to Rowlett (Texas) | 1,158.59 mi (1,864.57 km) |
