| Pontypridd to Olympia Heights (Florida) | 4,299.04 mi (6,918.63 km) |
| Pontypridd to Omaha (Nebraska) | 4,169.38 mi (6,709.98 km) |
| Pontypridd to On Top of the World Designated Place (Florida) | 4,212.55 mi (6,779.45 km) |
| Pontypridd to Onalaska (Wisconsin) | 3,865.43 mi (6,220.81 km) |
| Pontypridd to Oneida (New York) | 3,295.57 mi (5,303.71 km) |
| Pontypridd to Oneonta (New York) | 3,297.30 mi (5,306.49 km) |
| Pontypridd to Ontario (California) | 5,311.12 mi (8,547.42 km) |
| Pontypridd to Ontario (Oregon) | 4,736.60 mi (7,622.82 km) |
| Pontypridd to Opa-locka (Florida) | 4,286.62 mi (6,898.66 km) |
| Pontypridd to Opelika (Alabama) | 4,166.56 mi (6,705.43 km) |
| Pontypridd to Opelousas (Louisiana) | 4,546.74 mi (7,317.27 km) |
| Pontypridd to Orange (California) | 5,331.54 mi (8,580.28 km) |
| Pontypridd to Orange (Texas) | 4,635.05 mi (7,459.39 km) |
| Pontypridd to Orange City (Florida) | 4,178.93 mi (6,725.34 km) |
| Pontypridd to Orangeburg (South Carolina) | 3,939.59 mi (6,340.15 km) |
