| Caldicot to Olympia Heights (Florida) | 4,324.37 mi (6,959.40 km) |
| Caldicot to Omaha (Nebraska) | 4,191.71 mi (6,745.91 km) |
| Caldicot to On Top of the World Designated Place (Florida) | 4,237.64 mi (6,819.82 km) |
| Caldicot to Onalaska (Wisconsin) | 3,887.89 mi (6,256.95 km) |
| Caldicot to Oneida (New York) | 3,319.75 mi (5,342.62 km) |
| Caldicot to Oneonta (New York) | 3,321.61 mi (5,345.62 km) |
| Caldicot to Ontario (California) | 5,331.28 mi (8,579.87 km) |
| Caldicot to Ontario (Oregon) | 4,755.09 mi (7,652.57 km) |
| Caldicot to Opa-locka (Florida) | 4,311.95 mi (6,939.41 km) |
| Caldicot to Opelika (Alabama) | 4,191.17 mi (6,745.04 km) |
| Caldicot to Opelousas (Louisiana) | 4,570.98 mi (7,356.28 km) |
| Caldicot to Orange (California) | 5,351.70 mi (8,612.73 km) |
| Caldicot to Orange (Texas) | 4,659.17 mi (7,498.21 km) |
| Caldicot to Orange City (Florida) | 4,204.08 mi (6,765.81 km) |
| Caldicot to Orangeburg (South Carolina) | 3,964.45 mi (6,380.16 km) |
