| Porterville to Oerlinghausen | 5,585.81 mi (8,989.50 km) |
| Porterville to Oestrich-Winkel | 5,670.28 mi (9,125.43 km) |
| Porterville to Offenburg | 5,748.74 mi (9,251.70 km) |
| Porterville to Oftersheim | 5,720.33 mi (9,205.98 km) |
| Porterville to Ohrdruf | 5,703.19 mi (9,178.40 km) |
| Porterville to Ohringen | 5,755.82 mi (9,263.10 km) |
| Porterville to Olbernhau | 5,781.78 mi (9,304.87 km) |
| Porterville to Olching | 5,861.60 mi (9,433.33 km) |
| Porterville to Oldenburg | 5,511.68 mi (8,870.19 km) |
| Porterville to Oldenburg in Holstein | 5,520.49 mi (8,884.38 km) |
| Porterville to Olfen | 5,563.07 mi (8,952.90 km) |
| Porterville to Olpe | 5,612.29 mi (9,032.10 km) |
| Porterville to Olsberg | 5,613.16 mi (9,033.51 km) |
| Porterville to Oranienburg | 5,664.16 mi (9,115.59 km) |
| Porterville to Ortenberg | 5,681.73 mi (9,143.87 km) |
