| Bargoed to Odessa (Texas) | 4,882.36 mi (7,857.40 km) |
| Bargoed to Ogden (Utah) | 4,728.89 mi (7,610.41 km) |
| Bargoed to Oildale (California) | 5,278.91 mi (8,495.58 km) |
| Bargoed to Ojus (Florida) | 4,283.32 mi (6,893.34 km) |
| Bargoed to Okemos (Michigan) | 3,660.59 mi (5,891.16 km) |
| Bargoed to Oklahoma City (Oklahoma) | 4,512.63 mi (7,262.38 km) |
| Bargoed to Okmulgee (Oklahoma) | 4,447.37 mi (7,157.35 km) |
| Bargoed to Olathe (Kansas) | 4,239.77 mi (6,823.25 km) |
| Bargoed to Old Jamestown (Missouri) | 4,067.48 mi (6,545.97 km) |
| Bargoed to Oldsmar (Florida) | 4,284.33 mi (6,894.96 km) |
| Bargoed to Olean (New York) | 3,451.14 mi (5,554.08 km) |
| Bargoed to Olive Branch (Mississippi) | 4,237.79 mi (6,820.06 km) |
| Bargoed to Olivehurst (California) | 5,150.94 mi (8,289.64 km) |
| Bargoed to Olney (Maryland) | 3,524.16 mi (5,671.59 km) |
| Bargoed to Olympia (Washington) | 4,738.28 mi (7,625.52 km) |
