| McKinleyville to Olympia Heights (Florida) | 2,701.76 mi (4,348.06 km) |
| McKinleyville to Omaha (Nebraska) | 1,453.22 mi (2,338.73 km) |
| McKinleyville to On Top of the World Designated Place (Florida) | 2,475.63 mi (3,984.14 km) |
| McKinleyville to Onalaska (Wisconsin) | 1,678.07 mi (2,700.60 km) |
| McKinleyville to Oneida (New York) | 2,455.44 mi (3,951.64 km) |
| McKinleyville to Oneonta (New York) | 2,495.21 mi (4,015.66 km) |
| McKinleyville to Ontario (California) | 594.64 mi (956.99 km) |
| McKinleyville to Ontario (Oregon) | 419.81 mi (675.61 km) |
| McKinleyville to Opa-locka (Florida) | 2,699.28 mi (4,344.08 km) |
| McKinleyville to Opelika (Alabama) | 2,197.27 mi (3,536.16 km) |
| McKinleyville to Opelousas (Louisiana) | 1,920.55 mi (3,090.82 km) |
| McKinleyville to Orange (California) | 601.27 mi (967.66 km) |
| McKinleyville to Orange (Texas) | 1,849.69 mi (2,976.79 km) |
| McKinleyville to Orange City (Florida) | 2,533.52 mi (4,077.31 km) |
| McKinleyville to Orangeburg (South Carolina) | 2,407.65 mi (3,874.74 km) |
