| Potomac to Oswaldtwistle | 3,530.01 mi (5,681.01 km) |
| Potomac to Oswestry | 3,520.18 mi (5,665.18 km) |
| Potomac to Otley | 3,554.71 mi (5,720.75 km) |
| Potomac to Ovenden | 3,550.27 mi (5,713.62 km) |
| Potomac to Oxford | 3,614.90 mi (5,817.62 km) |
| Potomac to Oxted | 3,676.76 mi (5,917.17 km) |
| Potomac to Padbury | 3,622.70 mi (5,830.18 km) |
| Potomac to Padiham | 3,532.24 mi (5,684.60 km) |
| Potomac to Paignton | 3,546.92 mi (5,708.22 km) |
| Potomac to Paisley | 3,416.47 mi (5,498.28 km) |
| Potomac to Palmers Green | 3,664.54 mi (5,897.50 km) |
| Potomac to Parkstone | 3,608.56 mi (5,807.42 km) |
| Potomac to Partick | 3,420.33 mi (5,504.49 km) |
| Potomac to Patcham | 3,679.69 mi (5,921.89 km) |
| Potomac to Peebles | 3,466.27 mi (5,578.43 km) |
