| Longford to Oswego (Illinois) | 3,627.30 mi (5,837.58 km) |
| Longford to Oswego (New York) | 3,090.30 mi (4,973.36 km) |
| Longford to Otsego (Minnesota) | 3,655.75 mi (5,883.36 km) |
| Longford to Ottawa (Illinois) | 3,661.25 mi (5,892.22 km) |
| Longford to Ottawa (Kansas) | 4,037.62 mi (6,497.92 km) |
| Longford to Ottumwa (Iowa) | 3,812.62 mi (6,135.82 km) |
| Longford to Overland (Missouri) | 3,847.39 mi (6,191.78 km) |
| Longford to Overland Park (Kansas) | 4,001.74 mi (6,440.18 km) |
| Longford to Overlea (Maryland) | 3,272.43 mi (5,266.47 km) |
| Longford to Oviedo (Florida) | 3,983.33 mi (6,410.55 km) |
| Longford to Owasso (Oklahoma) | 4,175.11 mi (6,719.19 km) |
| Longford to Owatonna (Minnesota) | 3,696.57 mi (5,949.05 km) |
| Longford to Owensboro (Kentucky) | 3,767.24 mi (6,062.78 km) |
| Longford to Owings Mills (Maryland) | 3,281.22 mi (5,280.62 km) |
| Longford to Owosso (Michigan) | 3,408.32 mi (5,485.15 km) |
