| Potomac to Redondela | 3,502.48 mi (5,636.70 km) |
| Potomac to Reinosa | 3,695.91 mi (5,947.98 km) |
| Potomac to Requena | 3,939.29 mi (6,339.68 km) |
| Potomac to Reus | 3,993.55 mi (6,427.00 km) |
| Potomac to Rianxo | 3,484.02 mi (5,606.99 km) |
| Potomac to Ribadeo | 3,546.58 mi (5,707.67 km) |
| Potomac to Rincon de la Victoria | 3,868.31 mi (6,225.45 km) |
| Potomac to Ripoll | 4,012.18 mi (6,456.98 km) |
| Potomac to Ripollet | 4,032.03 mi (6,488.92 km) |
| Potomac to Rojales | 4,000.51 mi (6,438.20 km) |
| Potomac to Ronda | 3,823.89 mi (6,153.96 km) |
| Potomac to Roquetas de Mar | 3,949.41 mi (6,355.96 km) |
| Potomac to Rosas | 4,055.54 mi (6,526.76 km) |
| Potomac to Rubi | 4,026.34 mi (6,479.76 km) |
| Potomac to Rute | 3,845.90 mi (6,189.38 km) |
