| Monor to Olympia Heights (Florida) | 5,358.72 mi (8,624.02 km) |
| Monor to Omaha (Nebraska) | 5,153.45 mi (8,293.68 km) |
| Monor to On Top of the World Designated Place (Florida) | 5,269.75 mi (8,480.84 km) |
| Monor to Onalaska (Wisconsin) | 4,855.07 mi (7,813.48 km) |
| Monor to Oneida (New York) | 4,334.04 mi (6,974.96 km) |
| Monor to Oneonta (New York) | 4,339.05 mi (6,983.03 km) |
| Monor to Ontario (California) | 6,215.63 mi (10,003.08 km) |
| Monor to Ontario (Oregon) | 5,589.48 mi (8,995.41 km) |
| Monor to Opa-locka (Florida) | 5,346.30 mi (8,604.04 km) |
| Monor to Opelika (Alabama) | 5,214.19 mi (8,391.42 km) |
| Monor to Opelousas (Louisiana) | 5,584.81 mi (8,987.88 km) |
| Monor to Orange (California) | 6,235.76 mi (10,035.48 km) |
| Monor to Orange (Texas) | 5,669.78 mi (9,124.63 km) |
| Monor to Orange City (Florida) | 5,237.05 mi (8,428.21 km) |
| Monor to Orangeburg (South Carolina) | 4,992.79 mi (8,035.11 km) |
