| Port Lavaca to Olympia (Washington) | 1,900.41 mi (3,058.42 km) |
| Port Lavaca to Olympia Heights (Florida) | 1,020.15 mi (1,641.78 km) |
| Port Lavaca to Omaha (Nebraska) | 874.26 mi (1,406.98 km) |
| Port Lavaca to On Top of the World Designated Place (Florida) | 867.92 mi (1,396.78 km) |
| Port Lavaca to Onalaska (Wisconsin) | 1,096.78 mi (1,765.10 km) |
| Port Lavaca to Oneida (New York) | 1,533.80 mi (2,468.42 km) |
| Port Lavaca to Oneonta (New York) | 1,536.08 mi (2,472.08 km) |
| Port Lavaca to Ontario (California) | 1,290.82 mi (2,077.37 km) |
| Port Lavaca to Ontario (Oregon) | 1,546.39 mi (2,488.67 km) |
| Port Lavaca to Opa-locka (Florida) | 1,022.13 mi (1,644.96 km) |
| Port Lavaca to Opelika (Alabama) | 724.31 mi (1,165.66 km) |
| Port Lavaca to Opelousas (Louisiana) | 303.27 mi (488.07 km) |
| Port Lavaca to Orange (California) | 1,299.93 mi (2,092.04 km) |
| Port Lavaca to Orange (Texas) | 201.50 mi (324.29 km) |
| Port Lavaca to Orange City (Florida) | 928.59 mi (1,494.42 km) |
