| Takoma Park to Nuth | 3,917.74 mi (6,305.00 km) |
| Takoma Park to Oegstgeest | 3,828.72 mi (6,161.74 km) |
| Takoma Park to Oirschot | 3,879.10 mi (6,242.80 km) |
| Takoma Park to Oisterwijk | 3,872.96 mi (6,232.93 km) |
| Takoma Park to Oldebroek | 3,878.40 mi (6,241.69 km) |
| Takoma Park to Oldenzaal | 3,922.25 mi (6,312.24 km) |
| Takoma Park to Ommen | 3,896.87 mi (6,271.40 km) |
| Takoma Park to Oosterend | 3,870.80 mi (6,229.45 km) |
| Takoma Park to Oosterhout | 3,857.76 mi (6,208.46 km) |
| Takoma Park to Oosterwolde | 3,879.84 mi (6,244.00 km) |
| Takoma Park to Oostzaan | 3,838.96 mi (6,178.20 km) |
| Takoma Park to Opmeer | 3,834.96 mi (6,171.78 km) |
| Takoma Park to Oss | 3,880.84 mi (6,245.61 km) |
| Takoma Park to Oud-Beijerland | 3,835.18 mi (6,172.13 km) |
| Takoma Park to Oudenbosch | 3,845.83 mi (6,189.26 km) |
