| Monterey to Olympia Heights (Florida) | 2,546.64 mi (4,098.42 km) |
| Monterey to Omaha (Nebraska) | 1,419.60 mi (2,284.63 km) |
| Monterey to On Top of the World Designated Place (Florida) | 2,338.56 mi (3,763.55 km) |
| Monterey to Onalaska (Wisconsin) | 1,683.38 mi (2,709.14 km) |
| Monterey to Oneida (New York) | 2,460.98 mi (3,960.57 km) |
| Monterey to Oneonta (New York) | 2,495.60 mi (4,016.28 km) |
| Monterey to Ontario (California) | 298.57 mi (480.51 km) |
| Monterey to Ontario (Oregon) | 574.71 mi (924.91 km) |
| Monterey to Opa-locka (Florida) | 2,545.69 mi (4,096.90 km) |
| Monterey to Opelika (Alabama) | 2,080.60 mi (3,348.40 km) |
| Monterey to Opelousas (Louisiana) | 1,758.54 mi (2,830.10 km) |
| Monterey to Orange (California) | 299.33 mi (481.72 km) |
| Monterey to Orange (Texas) | 1,676.52 mi (2,698.09 km) |
| Monterey to Orange City (Florida) | 2,398.63 mi (3,860.22 km) |
| Monterey to Orangeburg (South Carolina) | 2,312.44 mi (3,721.52 km) |
