| Cwmbran to Odessa (Texas) | 4,891.87 mi (7,872.70 km) |
| Cwmbran to Ogden (Utah) | 4,737.71 mi (7,624.61 km) |
| Cwmbran to Oildale (California) | 5,287.66 mi (8,509.67 km) |
| Cwmbran to Ojus (Florida) | 4,292.96 mi (6,908.85 km) |
| Cwmbran to Okemos (Michigan) | 3,670.19 mi (5,906.60 km) |
| Cwmbran to Oklahoma City (Oklahoma) | 4,522.17 mi (7,277.72 km) |
| Cwmbran to Okmulgee (Oklahoma) | 4,456.93 mi (7,172.74 km) |
| Cwmbran to Olathe (Kansas) | 4,249.27 mi (6,838.54 km) |
| Cwmbran to Old Jamestown (Missouri) | 4,077.07 mi (6,561.41 km) |
| Cwmbran to Oldsmar (Florida) | 4,294.02 mi (6,910.57 km) |
| Cwmbran to Olean (New York) | 3,460.83 mi (5,569.67 km) |
| Cwmbran to Olive Branch (Mississippi) | 4,247.46 mi (6,835.62 km) |
| Cwmbran to Olivehurst (California) | 5,159.39 mi (8,303.24 km) |
| Cwmbran to Olney (Maryland) | 3,533.89 mi (5,687.24 km) |
| Cwmbran to Olympia (Washington) | 4,746.21 mi (7,638.29 km) |
