| Potomac to Portage (Indiana) | 554.98 mi (893.15 km) |
| Potomac to Portage (Michigan) | 492.06 mi (791.90 km) |
| Potomac to Portage (Wisconsin) | 709.06 mi (1,141.12 km) |
| Potomac to Portales (New Mexico) | 1,483.76 mi (2,387.89 km) |
| Potomac to Porterville (California) | 2,281.15 mi (3,671.15 km) |
| Potomac to Portland (Maine) | 482.13 mi (775.92 km) |
| Potomac to Portland (Oregon) | 2,334.90 mi (3,757.65 km) |
| Potomac to Portland (Tennessee) | 535.81 mi (862.30 km) |
| Potomac to Portland (Texas) | 1,386.83 mi (2,231.89 km) |
| Potomac to Portsmouth (New Hampshire) | 435.35 mi (700.62 km) |
| Potomac to Portsmouth (Ohio) | 309.74 mi (498.47 km) |
| Potomac to Portsmouth (Virginia) | 156.59 mi (252.01 km) |
| Potomac to Post Falls (Idaho) | 2,059.66 mi (3,314.70 km) |
| Potomac to Potomac Park (California) | 2,292.83 mi (3,689.95 km) |
| Potomac to Pottstown (Pennsylvania) | 118.75 mi (191.11 km) |
