| Gretz-Armainvilliers to Olympia Heights (Florida) | 4,598.22 mi (7,400.13 km) |
| Gretz-Armainvilliers to Omaha (Nebraska) | 4,502.26 mi (7,245.69 km) |
| Gretz-Armainvilliers to On Top of the World Designated Place (Florida) | 4,521.35 mi (7,276.41 km) |
| Gretz-Armainvilliers to Onalaska (Wisconsin) | 4,198.08 mi (6,756.16 km) |
| Gretz-Armainvilliers to Oneida (New York) | 3,619.67 mi (5,825.29 km) |
| Gretz-Armainvilliers to Oneonta (New York) | 3,619.98 mi (5,825.80 km) |
| Gretz-Armainvilliers to Ontario (California) | 5,643.34 mi (9,082.08 km) |
| Gretz-Armainvilliers to Ontario (Oregon) | 5,064.21 mi (8,150.06 km) |
| Gretz-Armainvilliers to Opa-locka (Florida) | 4,586.01 mi (7,380.47 km) |
| Gretz-Armainvilliers to Opelika (Alabama) | 4,485.07 mi (7,218.02 km) |
| Gretz-Armainvilliers to Opelousas (Louisiana) | 4,869.72 mi (7,837.06 km) |
| Gretz-Armainvilliers to Orange (California) | 5,663.75 mi (9,114.93 km) |
| Gretz-Armainvilliers to Orange (Texas) | 4,959.21 mi (7,981.08 km) |
| Gretz-Armainvilliers to Orange City (Florida) | 4,485.88 mi (7,219.32 km) |
| Gretz-Armainvilliers to Orangeburg (South Carolina) | 4,253.90 mi (6,845.99 km) |
