| Potomac to Owosso (Michigan) | 456.02 mi (733.89 km) |
| Potomac to Oxford (Alabama) | 610.55 mi (982.59 km) |
| Potomac to Oxford (Mississippi) | 754.56 mi (1,214.34 km) |
| Potomac to Oxford (Ohio) | 405.23 mi (652.16 km) |
| Potomac to Oxnard (California) | 2,331.74 mi (3,752.57 km) |
| Potomac to Oxon Hill (Maryland) | 19.63 mi (31.58 km) |
| Potomac to Ozark (Alabama) | 706.90 mi (1,137.64 km) |
| Potomac to Ozark (Missouri) | 881.46 mi (1,418.57 km) |
| Potomac to Pace (Florida) | 809.19 mi (1,302.27 km) |
| Potomac to Pacific Grove (California) | 2,422.55 mi (3,898.72 km) |
| Potomac to Pacifica (California) | 2,431.29 mi (3,912.79 km) |
| Potomac to Paducah (Kentucky) | 636.86 mi (1,024.93 km) |
| Potomac to Pahrump (Nevada) | 2,116.30 mi (3,405.85 km) |
| Potomac to Painesville (Ohio) | 284.05 mi (457.13 km) |
| Potomac to Palatine (Illinois) | 607.92 mi (978.35 km) |
