| Pontneddfechan to Oakley (California) | 5,203.32 mi (8,373.93 km) |
| Pontneddfechan to Oakton (Virginia) | 3,529.53 mi (5,680.23 km) |
| Pontneddfechan to Oakville (Missouri) | 4,072.13 mi (6,553.46 km) |
| Pontneddfechan to Oatfield (Oregon) | 4,808.72 mi (7,738.89 km) |
| Pontneddfechan to Ocala (Florida) | 4,190.90 mi (6,744.60 km) |
| Pontneddfechan to Ocean Acres (New Jersey) | 3,367.49 mi (5,419.44 km) |
| Pontneddfechan to Ocean City (New Jersey) | 3,401.50 mi (5,474.19 km) |
| Pontneddfechan to Ocean Pines (Maryland) | 3,463.13 mi (5,573.37 km) |
| Pontneddfechan to Ocean Pointe (Hawaii) | 7,156.56 mi (11,517.37 km) |
| Pontneddfechan to Ocean Springs (Mississippi) | 4,405.04 mi (7,089.22 km) |
| Pontneddfechan to Oceanside (California) | 5,332.10 mi (8,581.19 km) |
| Pontneddfechan to Oceanside (New York) | 3,302.55 mi (5,314.94 km) |
| Pontneddfechan to Ocoee (Florida) | 4,194.64 mi (6,750.62 km) |
| Pontneddfechan to Oconomowoc (Wisconsin) | 3,784.79 mi (6,091.03 km) |
| Pontneddfechan to Odenton (Maryland) | 3,496.66 mi (5,627.33 km) |
