| Potomac to Racale | 4,805.34 mi (7,733.44 km) |
| Potomac to Racconigi | 4,179.48 mi (6,726.23 km) |
| Potomac to Raffadali | 4,698.60 mi (7,561.67 km) |
| Potomac to Ragusa | 4,771.85 mi (7,679.55 km) |
| Potomac to Ramacca | 4,752.89 mi (7,649.04 km) |
| Potomac to Randazzo | 4,745.19 mi (7,636.64 km) |
| Potomac to Rapallo | 4,260.42 mi (6,856.49 km) |
| Potomac to Ravanusa | 4,723.81 mi (7,602.24 km) |
| Potomac to Ravenna | 4,386.43 mi (7,059.27 km) |
| Potomac to Recanati | 4,479.80 mi (7,209.54 km) |
| Potomac to Recco | 4,256.25 mi (6,849.78 km) |
| Potomac to Reggello | 4,382.71 mi (7,053.29 km) |
| Potomac to Reggio di Calabria | 4,768.06 mi (7,673.45 km) |
| Potomac to Reggio Emilia | 4,309.48 mi (6,935.44 km) |
| Potomac to Reggiolo | 4,310.15 mi (6,936.52 km) |
