| Llantrisant to Oakley (California) | 5,220.13 mi (8,400.99 km) |
| Llantrisant to Oakton (Virginia) | 3,542.44 mi (5,701.00 km) |
| Llantrisant to Oakville (Missouri) | 4,086.50 mi (6,576.59 km) |
| Llantrisant to Oatfield (Oregon) | 4,825.84 mi (7,766.45 km) |
| Llantrisant to Ocala (Florida) | 4,202.69 mi (6,763.58 km) |
| Llantrisant to Ocean Acres (New Jersey) | 3,380.17 mi (5,439.86 km) |
| Llantrisant to Ocean City (New Jersey) | 3,414.13 mi (5,494.51 km) |
| Llantrisant to Ocean Pines (Maryland) | 3,475.65 mi (5,593.51 km) |
| Llantrisant to Ocean Pointe (Hawaii) | 7,173.75 mi (11,545.04 km) |
| Llantrisant to Ocean Springs (Mississippi) | 4,418.02 mi (7,110.12 km) |
| Llantrisant to Oceanside (California) | 5,348.40 mi (8,607.42 km) |
| Llantrisant to Oceanside (New York) | 3,315.35 mi (5,335.53 km) |
| Llantrisant to Ocoee (Florida) | 4,206.22 mi (6,769.26 km) |
| Llantrisant to Oconomowoc (Wisconsin) | 3,799.65 mi (6,114.94 km) |
| Llantrisant to Odenton (Maryland) | 3,509.52 mi (5,648.03 km) |
