| Ruislip to Olympia Heights (Florida) | 4,422.87 mi (7,117.92 km) |
| Ruislip to Omaha (Nebraska) | 4,277.22 mi (6,883.52 km) |
| Ruislip to On Top of the World Designated Place (Florida) | 4,334.93 mi (6,976.40 km) |
| Ruislip to Onalaska (Wisconsin) | 3,973.97 mi (6,395.48 km) |
| Ruislip to Oneida (New York) | 3,413.05 mi (5,492.78 km) |
| Ruislip to Oneonta (New York) | 3,415.51 mi (5,496.73 km) |
| Ruislip to Ontario (California) | 5,407.74 mi (8,702.91 km) |
| Ruislip to Ontario (Oregon) | 4,824.87 mi (7,764.88 km) |
| Ruislip to Opa-locka (Florida) | 4,410.43 mi (7,097.90 km) |
| Ruislip to Opelika (Alabama) | 4,286.32 mi (6,898.16 km) |
| Ruislip to Opelousas (Louisiana) | 4,664.51 mi (7,506.80 km) |
| Ruislip to Orange (California) | 5,428.14 mi (8,735.75 km) |
| Ruislip to Orange (Texas) | 4,752.18 mi (7,647.89 km) |
| Ruislip to Orange City (Florida) | 4,301.67 mi (6,922.86 km) |
| Ruislip to Orangeburg (South Carolina) | 4,060.71 mi (6,535.09 km) |
