| Port Huron to Radauti | 4,799.68 mi (7,724.33 km) |
| Port Huron to Ramnicu Sarat | 4,954.99 mi (7,974.28 km) |
| Port Huron to Ramnicu Valcea | 4,871.95 mi (7,840.65 km) |
| Port Huron to Rasnov | 4,888.23 mi (7,866.85 km) |
| Port Huron to Reghin | 4,806.75 mi (7,735.72 km) |
| Port Huron to Resita | 4,772.11 mi (7,679.97 km) |
| Port Huron to Roman | 4,877.14 mi (7,849.01 km) |
| Port Huron to Rosiori de Vede | 4,940.66 mi (7,951.22 km) |
| Port Huron to Rovinari | 4,836.55 mi (7,783.68 km) |
| Port Huron to Roznov | 4,867.10 mi (7,832.84 km) |
| Port Huron to Sabaoani | 4,870.30 mi (7,838.00 km) |
| Port Huron to Sacele | 4,895.87 mi (7,879.14 km) |
| Port Huron to Sacueni | 4,687.61 mi (7,543.99 km) |
| Port Huron to Salcea | 4,824.12 mi (7,763.67 km) |
| Port Huron to Salonta | 4,696.31 mi (7,557.98 km) |
