| Potomac to Red Bank (New Jersey) | 190.10 mi (305.93 km) |
| Potomac to Red Bank (Tennessee) | 521.45 mi (839.19 km) |
| Potomac to Red Bluff (California) | 2,373.67 mi (3,820.05 km) |
| Potomac to Red Hill (South Carolina) | 375.62 mi (604.50 km) |
| Potomac to Red Oak (Texas) | 1,183.36 mi (1,904.44 km) |
| Potomac to Red Wing (Minnesota) | 880.11 mi (1,416.40 km) |
| Potomac to Redan (Georgia) | 531.81 mi (855.86 km) |
| Potomac to Redding (California) | 2,373.98 mi (3,820.56 km) |
| Potomac to Redland (Maryland) | 8.67 mi (13.95 km) |
| Potomac to Redlands (California) | 2,227.69 mi (3,585.11 km) |
| Potomac to Redmond (Oregon) | 2,272.41 mi (3,657.08 km) |
| Potomac to Redmond (Washington) | 2,300.41 mi (3,702.16 km) |
| Potomac to Redondo Beach (California) | 2,297.00 mi (3,696.66 km) |
| Potomac to Redwood City (California) | 2,420.18 mi (3,894.90 km) |
| Potomac to Reedley (California) | 2,291.89 mi (3,688.45 km) |
