| Abertawe to Olympia Heights (Florida) | 4,273.02 mi (6,876.76 km) |
| Abertawe to Omaha (Nebraska) | 4,146.29 mi (6,672.81 km) |
| Abertawe to On Top of the World Designated Place (Florida) | 4,186.75 mi (6,737.93 km) |
| Abertawe to Onalaska (Wisconsin) | 3,842.22 mi (6,183.45 km) |
| Abertawe to Oneida (New York) | 3,270.66 mi (5,263.61 km) |
| Abertawe to Oneonta (New York) | 3,272.25 mi (5,266.17 km) |
| Abertawe to Ontario (California) | 5,290.19 mi (8,513.73 km) |
| Abertawe to Ontario (Oregon) | 4,717.36 mi (7,591.86 km) |
| Abertawe to Opa-locka (Florida) | 4,260.61 mi (6,856.79 km) |
| Abertawe to Opelika (Alabama) | 4,141.21 mi (6,664.64 km) |
| Abertawe to Opelousas (Louisiana) | 4,521.74 mi (7,277.04 km) |
| Abertawe to Orange (California) | 5,310.61 mi (8,546.59 km) |
| Abertawe to Orange (Texas) | 4,610.17 mi (7,419.35 km) |
| Abertawe to Orange City (Florida) | 4,153.07 mi (6,683.73 km) |
| Abertawe to Orangeburg (South Carolina) | 3,914.00 mi (6,298.97 km) |
