| Potomac to Ramsbottom | 3,534.77 mi (5,688.66 km) |
| Potomac to Ramsgate | 3,732.92 mi (6,007.56 km) |
| Potomac to Raunds | 3,631.55 mi (5,844.42 km) |
| Potomac to Rawmarsh | 3,576.68 mi (5,756.10 km) |
| Potomac to Rawtenstall | 3,534.85 mi (5,688.79 km) |
| Potomac to Rayleigh | 3,694.24 mi (5,945.31 km) |
| Potomac to Raynes Park | 3,664.26 mi (5,897.06 km) |
| Potomac to Reading | 3,632.87 mi (5,846.53 km) |
| Potomac to Redcar | 3,565.29 mi (5,737.79 km) |
| Potomac to Reddish | 3,544.86 mi (5,704.90 km) |
| Potomac to Redditch | 3,576.20 mi (5,755.34 km) |
| Potomac to Redhill | 3,670.34 mi (5,906.84 km) |
| Potomac to Redruth | 3,480.85 mi (5,601.89 km) |
| Potomac to Reigate | 3,669.02 mi (5,904.72 km) |
| Potomac to Renfrew | 3,417.31 mi (5,499.64 km) |
