| Port Neches to Nuth | 5,034.54 mi (8,102.30 km) |
| Port Neches to Oegstgeest | 4,941.42 mi (7,952.45 km) |
| Port Neches to Oirschot | 4,993.98 mi (8,037.04 km) |
| Port Neches to Oisterwijk | 4,987.59 mi (8,026.75 km) |
| Port Neches to Oldebroek | 4,987.88 mi (8,027.21 km) |
| Port Neches to Oldenzaal | 5,030.95 mi (8,096.52 km) |
| Port Neches to Ommen | 5,005.28 mi (8,055.22 km) |
| Port Neches to Oosterend | 4,977.18 mi (8,010.00 km) |
| Port Neches to Oosterhout | 4,972.55 mi (8,002.54 km) |
| Port Neches to Oosterwolde | 4,985.97 mi (8,024.15 km) |
| Port Neches to Oostzaan | 4,949.88 mi (7,966.06 km) |
| Port Neches to Opmeer | 4,944.45 mi (7,957.32 km) |
| Port Neches to Oss | 4,994.19 mi (8,037.37 km) |
| Port Neches to Oud-Beijerland | 4,949.73 mi (7,965.82 km) |
| Port Neches to Oudenbosch | 4,961.29 mi (7,984.42 km) |
