| Takoma Park to Octeville | 3,638.59 mi (5,855.74 km) |
| Takoma Park to Oignies | 3,811.93 mi (6,134.70 km) |
| Takoma Park to Oissel | 3,760.72 mi (6,052.30 km) |
| Takoma Park to Olivet | 3,832.51 mi (6,167.83 km) |
| Takoma Park to Ollioules | 4,142.20 mi (6,666.23 km) |
| Takoma Park to Olonne-sur-Mer | 3,705.93 mi (5,964.11 km) |
| Takoma Park to Oloron-Sainte-Marie | 3,846.83 mi (6,190.87 km) |
| Takoma Park to Onet Village | 3,959.16 mi (6,371.66 km) |
| Takoma Park to Onnaing | 3,838.75 mi (6,177.88 km) |
| Takoma Park to Orange | 4,065.02 mi (6,542.01 km) |
| Takoma Park to Orchies | 3,822.06 mi (6,151.01 km) |
| Takoma Park to Orleans | 3,831.86 mi (6,166.79 km) |
| Takoma Park to Orly | 3,830.65 mi (6,164.84 km) |
| Takoma Park to Ormesson-sur-Marne | 3,835.72 mi (6,172.99 km) |
| Takoma Park to Orsay | 3,823.15 mi (6,152.76 km) |
