| Pontneddfechan to Odessa (Texas) | 4,867.06 mi (7,832.77 km) |
| Pontneddfechan to Ogden (Utah) | 4,714.57 mi (7,587.37 km) |
| Pontneddfechan to Oildale (California) | 5,264.69 mi (8,472.70 km) |
| Pontneddfechan to Ojus (Florida) | 4,267.99 mi (6,868.67 km) |
| Pontneddfechan to Okemos (Michigan) | 3,645.17 mi (5,866.34 km) |
| Pontneddfechan to Oklahoma City (Oklahoma) | 4,497.30 mi (7,237.70 km) |
| Pontneddfechan to Okmulgee (Oklahoma) | 4,431.99 mi (7,132.61 km) |
| Pontneddfechan to Olathe (Kansas) | 4,224.48 mi (6,798.64 km) |
| Pontneddfechan to Old Jamestown (Missouri) | 4,052.06 mi (6,521.16 km) |
| Pontneddfechan to Oldsmar (Florida) | 4,268.86 mi (6,870.07 km) |
| Pontneddfechan to Olean (New York) | 3,435.61 mi (5,529.09 km) |
| Pontneddfechan to Olive Branch (Mississippi) | 4,222.27 mi (6,795.09 km) |
| Pontneddfechan to Olivehurst (California) | 5,137.19 mi (8,267.50 km) |
| Pontneddfechan to Olney (Maryland) | 3,508.61 mi (5,646.56 km) |
| Pontneddfechan to Olympia (Washington) | 4,725.31 mi (7,604.65 km) |
