| Kastamonu to Oswego (Illinois) | 5,655.70 mi (9,101.96 km) |
| Kastamonu to Oswego (New York) | 5,153.30 mi (8,293.44 km) |
| Kastamonu to Otsego (Minnesota) | 5,627.08 mi (9,055.91 km) |
| Kastamonu to Ottawa (Illinois) | 5,689.29 mi (9,156.03 km) |
| Kastamonu to Ottawa (Kansas) | 6,048.10 mi (9,733.48 km) |
| Kastamonu to Ottumwa (Iowa) | 5,823.88 mi (9,372.62 km) |
| Kastamonu to Overland (Missouri) | 5,883.34 mi (9,468.33 km) |
| Kastamonu to Overland Park (Kansas) | 6,013.81 mi (9,678.29 km) |
| Kastamonu to Overlea (Maryland) | 5,348.30 mi (8,607.26 km) |
| Kastamonu to Oviedo (Florida) | 6,063.55 mi (9,758.34 km) |
| Kastamonu to Owasso (Oklahoma) | 6,196.22 mi (9,971.85 km) |
| Kastamonu to Owatonna (Minnesota) | 5,680.24 mi (9,141.47 km) |
| Kastamonu to Owensboro (Kentucky) | 5,821.31 mi (9,368.49 km) |
| Kastamonu to Owings Mills (Maryland) | 5,356.57 mi (8,620.56 km) |
| Kastamonu to Owosso (Michigan) | 5,447.50 mi (8,766.90 km) |
