| Potomac to Rende | 4,745.24 mi (7,636.73 km) |
| Potomac to Resana | 4,334.43 mi (6,975.58 km) |
| Potomac to Rescaldina | 4,207.30 mi (6,770.99 km) |
| Potomac to Rezzato | 4,269.06 mi (6,870.39 km) |
| Potomac to Rho | 4,213.53 mi (6,781.03 km) |
| Potomac to Ribera | 4,682.67 mi (7,536.02 km) |
| Potomac to Riccione Marina | 4,420.02 mi (7,113.33 km) |
| Potomac to Riesi | 4,728.44 mi (7,609.69 km) |
| Potomac to Rieti | 4,485.00 mi (7,217.91 km) |
| Potomac to Rignano Flaminio | 4,475.87 mi (7,203.21 km) |
| Potomac to Rignano sull'Arno | 4,377.74 mi (7,045.30 km) |
| Potomac to Rimini | 4,414.45 mi (7,104.37 km) |
| Potomac to Rionero in Vulture | 4,662.44 mi (7,503.48 km) |
| Potomac to Riposto | 4,762.29 mi (7,664.17 km) |
| Potomac to Riva del Garda | 4,279.62 mi (6,887.39 km) |
