| Potomac to River Ridge (Louisiana) | 968.60 mi (1,558.82 km) |
| Potomac to Riverbank (California) | 2,348.51 mi (3,779.56 km) |
| Potomac to Riverdale (Georgia) | 550.38 mi (885.75 km) |
| Potomac to Riverdale (Illinois) | 578.81 mi (931.51 km) |
| Potomac to Riverside (California) | 2,242.44 mi (3,608.86 km) |
| Potomac to Riverside (Ohio) | 373.58 mi (601.22 km) |
| Potomac to Riverton (Utah) | 1,837.53 mi (2,957.22 km) |
| Potomac to Riverton (Wyoming) | 1,641.15 mi (2,641.17 km) |
| Potomac to Riverview (Florida) | 827.07 mi (1,331.03 km) |
| Potomac to Riverview (Michigan) | 382.89 mi (616.20 km) |
| Potomac to Riviera Beach (Florida) | 861.42 mi (1,386.32 km) |
| Potomac to Riviera Beach (Maryland) | 37.29 mi (60.01 km) |
| Potomac to Roanoke (Virginia) | 192.16 mi (309.26 km) |
| Potomac to Roanoke Rapids (North Carolina) | 179.22 mi (288.43 km) |
| Potomac to Robbinsdale (Minnesota) | 924.45 mi (1,487.76 km) |
