| Takoma Park to Orbetello | 4,404.36 mi (7,088.14 km) |
| Takoma Park to Oria | 4,757.26 mi (7,656.07 km) |
| Takoma Park to Oristano | 4,373.39 mi (7,038.30 km) |
| Takoma Park to Orta Nova | 4,641.87 mi (7,470.37 km) |
| Takoma Park to Orte | 4,455.32 mi (7,170.15 km) |
| Takoma Park to Ortona | 4,547.27 mi (7,318.12 km) |
| Takoma Park to Orvieto | 4,434.20 mi (7,136.15 km) |
| Takoma Park to Orzinuovi | 4,249.58 mi (6,839.04 km) |
| Takoma Park to Osimo | 4,467.09 mi (7,189.08 km) |
| Takoma Park to Ospitaletto | 4,250.54 mi (6,840.58 km) |
| Takoma Park to Ostuni | 4,746.12 mi (7,638.15 km) |
| Takoma Park to Ottaviano | 4,605.41 mi (7,411.69 km) |
| Takoma Park to Ovada | 4,218.51 mi (6,789.03 km) |
| Takoma Park to Ozieri | 4,368.95 mi (7,031.14 km) |
| Takoma Park to Paceco | 4,624.11 mi (7,441.78 km) |
