| Potomac to Roy (Utah) | 1,835.97 mi (2,954.71 km) |
| Potomac to Royal Kunia (Hawaii) | 4,824.23 mi (7,763.85 km) |
| Potomac to Royal Oak (Michigan) | 394.25 mi (634.48 km) |
| Potomac to Royal Palm Beach (Florida) | 868.39 mi (1,397.54 km) |
| Potomac to Royse City (Texas) | 1,144.72 mi (1,842.26 km) |
| Potomac to Ruskin (Florida) | 837.06 mi (1,347.12 km) |
| Potomac to Russellville (Alabama) | 660.48 mi (1,062.94 km) |
| Potomac to Russellville (Arkansas) | 913.90 mi (1,470.78 km) |
| Potomac to Ruston (Louisiana) | 972.77 mi (1,565.52 km) |
| Potomac to Rutherford (New Jersey) | 205.80 mi (331.20 km) |
| Potomac to Rutland (Vermont) | 385.46 mi (620.34 km) |
| Potomac to Sabana Grande (Puerto Rico) | 1,571.16 mi (2,528.54 km) |
| Potomac to Sachse (Texas) | 1,158.39 mi (1,864.25 km) |
| Potomac to Saco (Maine) | 468.68 mi (754.27 km) |
| Potomac to Sacramento (California) | 2,360.45 mi (3,798.77 km) |
