| Potomac to Rivalta di Torino | 4,163.88 mi (6,701.12 km) |
| Potomac to Rivarolo Canavese | 4,163.19 mi (6,700.01 km) |
| Potomac to Rivoli | 4,162.73 mi (6,699.27 km) |
| Potomac to Rocca di Papa | 4,501.55 mi (7,244.54 km) |
| Potomac to Rocca Priora | 4,503.16 mi (7,247.13 km) |
| Potomac to Roccapiemonte | 4,625.38 mi (7,443.82 km) |
| Potomac to Roccastrada | 4,389.90 mi (7,064.86 km) |
| Potomac to Romano di Lombardia | 4,244.77 mi (6,831.30 km) |
| Potomac to Rome | 4,486.73 mi (7,220.69 km) |
| Potomac to Roncade | 4,352.71 mi (7,005.02 km) |
| Potomac to Ronchi dei Legionari | 4,392.73 mi (7,069.41 km) |
| Potomac to Ronciglione | 4,460.90 mi (7,179.12 km) |
| Potomac to Rosa | 4,323.89 mi (6,958.63 km) |
| Potomac to Rosarno | 4,768.68 mi (7,674.44 km) |
| Potomac to Rosignano Marittimo | 4,345.86 mi (6,993.98 km) |
