| Monovar to Olympia Heights (Florida) | 4,596.17 mi (7,396.83 km) |
| Monovar to Omaha (Nebraska) | 4,775.47 mi (7,685.38 km) |
| Monovar to On Top of the World Designated Place (Florida) | 4,571.35 mi (7,356.87 km) |
| Monovar to Onalaska (Wisconsin) | 4,470.49 mi (7,194.55 km) |
| Monovar to Oneida (New York) | 3,796.37 mi (6,109.67 km) |
| Monovar to Oneonta (New York) | 3,785.01 mi (6,091.38 km) |
| Monovar to Ontario (California) | 5,998.01 mi (9,652.86 km) |
| Monovar to Ontario (Oregon) | 5,486.11 mi (8,829.04 km) |
| Monovar to Opa-locka (Florida) | 4,585.22 mi (7,379.19 km) |
| Monovar to Opelika (Alabama) | 4,596.87 mi (7,397.95 km) |
| Monovar to Opelousas (Louisiana) | 5,007.61 mi (8,058.96 km) |
| Monovar to Orange (California) | 6,018.27 mi (9,685.48 km) |
| Monovar to Orange (Texas) | 5,105.51 mi (8,216.52 km) |
| Monovar to Orange City (Florida) | 4,526.47 mi (7,284.64 km) |
| Monovar to Orangeburg (South Carolina) | 4,343.26 mi (6,989.80 km) |
