| Porterville to Nuth | 5,561.18 mi (8,949.85 km) |
| Porterville to Oegstgeest | 5,455.62 mi (8,779.97 km) |
| Porterville to Oirschot | 5,514.40 mi (8,874.57 km) |
| Porterville to Oisterwijk | 5,507.26 mi (8,863.08 km) |
| Porterville to Oldebroek | 5,483.32 mi (8,824.55 km) |
| Porterville to Oldenzaal | 5,519.33 mi (8,882.51 km) |
| Porterville to Ommen | 5,494.52 mi (8,842.57 km) |
| Porterville to Oosterend | 5,459.75 mi (8,786.63 km) |
| Porterville to Oosterhout | 5,494.21 mi (8,842.08 km) |
| Porterville to Oosterwolde | 5,466.73 mi (8,797.85 km) |
| Porterville to Oostzaan | 5,455.10 mi (8,779.13 km) |
| Porterville to Opmeer | 5,443.56 mi (8,760.56 km) |
| Porterville to Oss | 5,507.14 mi (8,862.89 km) |
| Porterville to Oud-Beijerland | 5,472.08 mi (8,806.47 km) |
| Porterville to Oudenbosch | 5,487.16 mi (8,830.73 km) |
