| Gentilly to Olympia Heights (Florida) | 4,579.81 mi (7,370.50 km) |
| Gentilly to Omaha (Nebraska) | 4,484.85 mi (7,217.68 km) |
| Gentilly to On Top of the World Designated Place (Florida) | 4,502.92 mi (7,246.74 km) |
| Gentilly to Onalaska (Wisconsin) | 4,180.62 mi (6,728.06 km) |
| Gentilly to Oneida (New York) | 3,601.49 mi (5,796.04 km) |
| Gentilly to Oneonta (New York) | 3,601.75 mi (5,796.46 km) |
| Gentilly to Ontario (California) | 5,627.04 mi (9,055.85 km) |
| Gentilly to Ontario (Oregon) | 5,048.83 mi (8,125.31 km) |
| Gentilly to Opa-locka (Florida) | 4,567.60 mi (7,350.83 km) |
| Gentilly to Opelika (Alabama) | 4,466.73 mi (7,188.51 km) |
| Gentilly to Opelousas (Louisiana) | 4,851.49 mi (7,807.72 km) |
| Gentilly to Orange (California) | 5,647.46 mi (9,088.71 km) |
| Gentilly to Orange (Texas) | 4,941.02 mi (7,951.81 km) |
| Gentilly to Orange City (Florida) | 4,467.44 mi (7,189.65 km) |
| Gentilly to Orangeburg (South Carolina) | 4,235.50 mi (6,816.38 km) |
