| Potomac to Oststeinbek | 4,018.29 mi (6,466.82 km) |
| Potomac to Ottendorf-Okrilla | 4,228.37 mi (6,804.90 km) |
| Potomac to Ottersberg | 3,992.28 mi (6,424.96 km) |
| Potomac to Ottobrunn | 4,242.61 mi (6,827.82 km) |
| Potomac to Ottweiler | 4,018.93 mi (6,467.84 km) |
| Potomac to Overath | 3,979.70 mi (6,404.71 km) |
| Potomac to Oyten | 3,988.33 mi (6,418.59 km) |
| Potomac to Paderborn | 4,015.62 mi (6,462.52 km) |
| Potomac to Papenburg | 3,926.34 mi (6,318.83 km) |
| Potomac to Parchim | 4,084.29 mi (6,573.03 km) |
| Potomac to Pasewalk | 4,162.02 mi (6,698.12 km) |
| Potomac to Passau | 4,298.86 mi (6,918.35 km) |
| Potomac to Pattensen | 4,039.30 mi (6,500.63 km) |
| Potomac to Pegnitz | 4,184.10 mi (6,733.66 km) |
| Potomac to Peine | 4,055.71 mi (6,527.03 km) |
