| Bargoed to Oswego (Illinois) | 3,858.75 mi (6,210.07 km) |
| Bargoed to Oswego (New York) | 3,315.75 mi (5,336.18 km) |
| Bargoed to Otsego (Minnesota) | 3,891.50 mi (6,262.76 km) |
| Bargoed to Ottawa (Illinois) | 3,892.71 mi (6,264.71 km) |
| Bargoed to Ottawa (Kansas) | 4,270.52 mi (6,872.74 km) |
| Bargoed to Ottumwa (Iowa) | 4,045.69 mi (6,510.90 km) |
| Bargoed to Overland (Missouri) | 4,077.58 mi (6,562.23 km) |
| Bargoed to Overland Park (Kansas) | 4,234.54 mi (6,814.83 km) |
| Bargoed to Overlea (Maryland) | 3,491.77 mi (5,619.46 km) |
| Bargoed to Oviedo (Florida) | 4,191.61 mi (6,745.75 km) |
| Bargoed to Owasso (Oklahoma) | 4,406.81 mi (7,092.08 km) |
| Bargoed to Owatonna (Minnesota) | 3,931.69 mi (6,327.44 km) |
| Bargoed to Owensboro (Kentucky) | 3,994.21 mi (6,428.06 km) |
| Bargoed to Owings Mills (Maryland) | 3,500.92 mi (5,634.19 km) |
| Bargoed to Owosso (Michigan) | 3,638.54 mi (5,855.66 km) |
