| Cwmbran to Oswego (Illinois) | 3,868.31 mi (6,225.44 km) |
| Cwmbran to Oswego (New York) | 3,325.43 mi (5,351.76 km) |
| Cwmbran to Otsego (Minnesota) | 3,900.80 mi (6,277.72 km) |
| Cwmbran to Ottawa (Illinois) | 3,902.26 mi (6,280.09 km) |
| Cwmbran to Ottawa (Kansas) | 4,280.02 mi (6,888.03 km) |
| Cwmbran to Ottumwa (Iowa) | 4,055.18 mi (6,526.18 km) |
| Cwmbran to Overland (Missouri) | 4,087.17 mi (6,577.67 km) |
| Cwmbran to Overland Park (Kansas) | 4,244.04 mi (6,830.12 km) |
| Cwmbran to Overlea (Maryland) | 3,501.50 mi (5,635.11 km) |
| Cwmbran to Oviedo (Florida) | 4,201.30 mi (6,761.34 km) |
| Cwmbran to Owasso (Oklahoma) | 4,416.36 mi (7,107.44 km) |
| Cwmbran to Owatonna (Minnesota) | 3,941.05 mi (6,342.50 km) |
| Cwmbran to Owensboro (Kentucky) | 4,003.87 mi (6,443.61 km) |
| Cwmbran to Owings Mills (Maryland) | 3,510.65 mi (5,649.84 km) |
| Cwmbran to Owosso (Michigan) | 3,648.13 mi (5,871.10 km) |
