| Port Neches to Oerlinghausen | 5,107.26 mi (8,219.33 km) |
| Port Neches to Oestrich-Winkel | 5,146.38 mi (8,282.30 km) |
| Port Neches to Offenburg | 5,194.41 mi (8,359.60 km) |
| Port Neches to Oftersheim | 5,190.19 mi (8,352.80 km) |
| Port Neches to Ohrdruf | 5,223.40 mi (8,406.24 km) |
| Port Neches to Ohringen | 5,231.93 mi (8,419.98 km) |
| Port Neches to Olbernhau | 5,326.57 mi (8,572.28 km) |
| Port Neches to Olching | 5,338.32 mi (8,591.20 km) |
| Port Neches to Oldenburg | 5,052.19 mi (8,130.72 km) |
| Port Neches to Oldenburg in Holstein | 5,109.84 mi (8,223.49 km) |
| Port Neches to Olfen | 5,066.97 mi (8,154.50 km) |
| Port Neches to Olpe | 5,106.70 mi (8,218.44 km) |
| Port Neches to Olsberg | 5,120.61 mi (8,240.82 km) |
| Port Neches to Oranienburg | 5,247.26 mi (8,444.65 km) |
| Port Neches to Ortenberg | 5,175.51 mi (8,329.18 km) |
