| Pontypridd to Oswego (Illinois) | 3,857.48 mi (6,208.02 km) |
| Pontypridd to Oswego (New York) | 3,313.81 mi (5,333.05 km) |
| Pontypridd to Otsego (Minnesota) | 3,891.04 mi (6,262.03 km) |
| Pontypridd to Ottawa (Illinois) | 3,891.44 mi (6,262.67 km) |
| Pontypridd to Ottawa (Kansas) | 4,269.46 mi (6,871.04 km) |
| Pontypridd to Ottumwa (Iowa) | 4,044.66 mi (6,509.25 km) |
| Pontypridd to Overland (Missouri) | 4,076.13 mi (6,559.90 km) |
| Pontypridd to Overland Park (Kansas) | 4,233.46 mi (6,813.10 km) |
| Pontypridd to Overlea (Maryland) | 3,489.30 mi (5,615.49 km) |
| Pontypridd to Oviedo (Florida) | 4,188.38 mi (6,740.54 km) |
| Pontypridd to Owasso (Oklahoma) | 4,405.57 mi (7,090.07 km) |
| Pontypridd to Owatonna (Minnesota) | 3,931.07 mi (6,326.45 km) |
| Pontypridd to Owensboro (Kentucky) | 3,992.40 mi (6,425.15 km) |
| Pontypridd to Owings Mills (Maryland) | 3,498.48 mi (5,630.26 km) |
| Pontypridd to Owosso (Michigan) | 3,637.11 mi (5,853.36 km) |
