| Llantwit Major to Oakley (California) | 5,223.59 mi (8,406.56 km) |
| Llantwit Major to Oakton (Virginia) | 3,540.98 mi (5,698.66 km) |
| Llantwit Major to Oakville (Missouri) | 4,086.45 mi (6,576.51 km) |
| Llantwit Major to Oatfield (Oregon) | 4,830.14 mi (7,773.36 km) |
| Llantwit Major to Ocala (Florida) | 4,200.30 mi (6,759.73 km) |
| Llantwit Major to Ocean Acres (New Jersey) | 3,378.53 mi (5,437.21 km) |
| Llantwit Major to Ocean City (New Jersey) | 3,412.44 mi (5,491.78 km) |
| Llantwit Major to Ocean Pines (Maryland) | 3,473.86 mi (5,590.63 km) |
| Llantwit Major to Ocean Pointe (Hawaii) | 7,180.53 mi (11,555.95 km) |
| Llantwit Major to Ocean Springs (Mississippi) | 4,416.63 mi (7,107.87 km) |
| Llantwit Major to Oceanside (California) | 5,350.86 mi (8,611.38 km) |
| Llantwit Major to Oceanside (New York) | 3,313.79 mi (5,333.03 km) |
| Llantwit Major to Ocoee (Florida) | 4,203.67 mi (6,765.15 km) |
| Llantwit Major to Oconomowoc (Wisconsin) | 3,800.14 mi (6,115.73 km) |
| Llantwit Major to Odenton (Maryland) | 3,508.03 mi (5,645.63 km) |
