| Mentana to Olympia Heights (Florida) | 5,195.09 mi (8,360.70 km) |
| Mentana to Omaha (Nebraska) | 5,167.47 mi (8,316.23 km) |
| Mentana to On Top of the World Designated Place (Florida) | 5,137.23 mi (8,267.57 km) |
| Mentana to Onalaska (Wisconsin) | 4,862.76 mi (7,825.86 km) |
| Mentana to Oneida (New York) | 4,267.35 mi (6,867.63 km) |
| Mentana to Oneonta (New York) | 4,264.99 mi (6,863.85 km) |
| Mentana to Ontario (California) | 6,310.10 mi (10,155.13 km) |
| Mentana to Ontario (Oregon) | 5,724.30 mi (9,212.38 km) |
| Mentana to Opa-locka (Florida) | 5,183.32 mi (8,341.74 km) |
| Mentana to Opelika (Alabama) | 5,120.11 mi (8,240.02 km) |
| Mentana to Opelousas (Louisiana) | 5,513.06 mi (8,872.41 km) |
| Mentana to Orange (California) | 6,330.51 mi (10,187.96 km) |
| Mentana to Orange (Texas) | 5,604.87 mi (9,020.16 km) |
| Mentana to Orange City (Florida) | 5,098.29 mi (8,204.91 km) |
| Mentana to Orangeburg (South Carolina) | 4,881.36 mi (7,855.79 km) |
