| Caldicot to Oswego (Illinois) | 3,880.66 mi (6,245.32 km) |
| Caldicot to Oswego (New York) | 3,337.85 mi (5,371.75 km) |
| Caldicot to Otsego (Minnesota) | 3,912.93 mi (6,297.25 km) |
| Caldicot to Ottawa (Illinois) | 3,914.62 mi (6,299.97 km) |
| Caldicot to Ottawa (Kansas) | 4,292.33 mi (6,907.84 km) |
| Caldicot to Ottumwa (Iowa) | 4,067.48 mi (6,545.98 km) |
| Caldicot to Overland (Missouri) | 4,099.55 mi (6,597.59 km) |
| Caldicot to Overland Park (Kansas) | 4,256.35 mi (6,849.94 km) |
| Caldicot to Overlea (Maryland) | 3,513.89 mi (5,655.07 km) |
| Caldicot to Oviedo (Florida) | 4,213.54 mi (6,781.04 km) |
| Caldicot to Owasso (Oklahoma) | 4,428.71 mi (7,127.32 km) |
| Caldicot to Owatonna (Minnesota) | 3,953.24 mi (6,362.12 km) |
| Caldicot to Owensboro (Kentucky) | 4,016.29 mi (6,463.59 km) |
| Caldicot to Owings Mills (Maryland) | 3,523.05 mi (5,669.80 km) |
| Caldicot to Owosso (Michigan) | 3,660.51 mi (5,891.02 km) |
