| Mackworth to Oswego (Illinois) | 3,885.74 mi (6,253.49 km) |
| Mackworth to Oswego (New York) | 3,352.88 mi (5,395.94 km) |
| Mackworth to Otsego (Minnesota) | 3,906.43 mi (6,286.79 km) |
| Mackworth to Ottawa (Illinois) | 3,919.67 mi (6,308.10 km) |
| Mackworth to Ottawa (Kansas) | 4,294.16 mi (6,910.79 km) |
| Mackworth to Ottumwa (Iowa) | 4,069.00 mi (6,548.42 km) |
| Mackworth to Overland (Missouri) | 4,106.99 mi (6,609.56 km) |
| Mackworth to Overland Park (Kansas) | 4,258.44 mi (6,853.30 km) |
| Mackworth to Overlea (Maryland) | 3,536.42 mi (5,691.32 km) |
| Mackworth to Oviedo (Florida) | 4,246.88 mi (6,834.69 km) |
| Mackworth to Owasso (Oklahoma) | 4,433.13 mi (7,134.44 km) |
| Mackworth to Owatonna (Minnesota) | 3,949.04 mi (6,355.37 km) |
| Mackworth to Owensboro (Kentucky) | 4,029.00 mi (6,484.05 km) |
| Mackworth to Owings Mills (Maryland) | 3,545.17 mi (5,705.40 km) |
| Mackworth to Owosso (Michigan) | 3,667.99 mi (5,903.05 km) |
