| Oldsmar to Oerlinghausen | 4,770.22 mi (7,676.92 km) |
| Oldsmar to Oestrich-Winkel | 4,787.63 mi (7,704.94 km) |
| Oldsmar to Offenburg | 4,820.36 mi (7,757.61 km) |
| Oldsmar to Oftersheim | 4,826.88 mi (7,768.12 km) |
| Oldsmar to Ohrdruf | 4,880.85 mi (7,854.97 km) |
| Oldsmar to Ohringen | 4,869.66 mi (7,836.96 km) |
| Oldsmar to Olbernhau | 4,990.49 mi (8,031.42 km) |
| Oldsmar to Olching | 4,972.02 mi (8,001.69 km) |
| Oldsmar to Oldenburg | 4,726.07 mi (7,605.87 km) |
| Oldsmar to Oldenburg in Holstein | 4,803.00 mi (7,729.68 km) |
| Oldsmar to Olfen | 4,723.87 mi (7,602.34 km) |
| Oldsmar to Olpe | 4,757.69 mi (7,656.77 km) |
| Oldsmar to Olsberg | 4,776.79 mi (7,687.49 km) |
| Oldsmar to Oranienburg | 4,931.52 mi (7,936.52 km) |
| Oldsmar to Ortenberg | 4,823.33 mi (7,762.39 km) |
