| Port Huron to Rivalta di Torino | 4,223.98 mi (6,797.84 km) |
| Port Huron to Rivarolo Canavese | 4,220.78 mi (6,792.69 km) |
| Port Huron to Rivoli | 4,222.60 mi (6,795.61 km) |
| Port Huron to Rocca di Papa | 4,567.27 mi (7,350.31 km) |
| Port Huron to Rocca Priora | 4,568.63 mi (7,352.50 km) |
| Port Huron to Roccapiemonte | 4,690.94 mi (7,549.34 km) |
| Port Huron to Roccastrada | 4,452.64 mi (7,165.84 km) |
| Port Huron to Romano di Lombardia | 4,295.60 mi (6,913.10 km) |
| Port Huron to Rome | 4,552.40 mi (7,326.38 km) |
| Port Huron to Roncade | 4,395.54 mi (7,073.94 km) |
| Port Huron to Ronchi dei Legionari | 4,431.06 mi (7,131.11 km) |
| Port Huron to Ronciglione | 4,524.97 mi (7,282.24 km) |
| Port Huron to Rosa | 4,367.84 mi (7,029.37 km) |
| Port Huron to Rosarno | 4,843.21 mi (7,794.39 km) |
| Port Huron to Rosignano Marittimo | 4,408.21 mi (7,094.33 km) |
