| Potomac to Reidsville (North Carolina) | 229.25 mi (368.94 km) |
| Potomac to Reisterstown (Maryland) | 36.64 mi (58.96 km) |
| Potomac to Rendon (Texas) | 1,204.67 mi (1,938.73 km) |
| Potomac to Reno (Nevada) | 2,259.68 mi (3,636.61 km) |
| Potomac to Renton (Washington) | 2,304.37 mi (3,708.52 km) |
| Potomac to Republic (Missouri) | 891.96 mi (1,435.47 km) |
| Potomac to Reston (Virginia) | 9.29 mi (14.95 km) |
| Potomac to Revere (Massachusetts) | 400.36 mi (644.32 km) |
| Potomac to Rexburg (Idaho) | 1,809.46 mi (2,912.04 km) |
| Potomac to Reynoldsburg (Ohio) | 305.61 mi (491.83 km) |
| Potomac to Rialto (California) | 2,237.75 mi (3,601.31 km) |
| Potomac to Richardson (Texas) | 1,165.16 mi (1,875.15 km) |
| Potomac to Richfield (Minnesota) | 918.48 mi (1,478.15 km) |
| Potomac to Richfield (Wisconsin) | 644.03 mi (1,036.46 km) |
| Potomac to Richland (Washington) | 2,170.58 mi (3,493.21 km) |
