| Port Neches to Olympia (Washington) | 1,940.84 mi (3,123.48 km) |
| Port Neches to Olympia Heights (Florida) | 880.93 mi (1,417.71 km) |
| Port Neches to Omaha (Nebraska) | 788.66 mi (1,269.22 km) |
| Port Neches to On Top of the World Designated Place (Florida) | 703.13 mi (1,131.57 km) |
| Port Neches to Onalaska (Wisconsin) | 972.88 mi (1,565.70 km) |
| Port Neches to Oneida (New York) | 1,354.54 mi (2,179.92 km) |
| Port Neches to Oneonta (New York) | 1,354.98 mi (2,180.62 km) |
| Port Neches to Ontario (California) | 1,411.03 mi (2,270.83 km) |
| Port Neches to Ontario (Oregon) | 1,589.74 mi (2,558.44 km) |
| Port Neches to Opa-locka (Florida) | 881.17 mi (1,418.10 km) |
| Port Neches to Opelika (Alabama) | 538.52 mi (866.66 km) |
| Port Neches to Opelousas (Louisiana) | 117.55 mi (189.18 km) |
| Port Neches to Orange (California) | 1,422.04 mi (2,288.56 km) |
| Port Neches to Orange (Texas) | 14.99 mi (24.12 km) |
| Port Neches to Orange City (Florida) | 764.52 mi (1,230.37 km) |
