| Frederikssund to Oswego (Illinois) | 4,261.22 mi (6,857.77 km) |
| Frederikssund to Oswego (New York) | 3,772.71 mi (6,071.59 km) |
| Frederikssund to Otsego (Minnesota) | 4,232.35 mi (6,811.30 km) |
| Frederikssund to Ottawa (Illinois) | 4,294.72 mi (6,911.68 km) |
| Frederikssund to Ottawa (Kansas) | 4,651.90 mi (7,486.52 km) |
| Frederikssund to Ottumwa (Iowa) | 4,427.77 mi (7,125.80 km) |
| Frederikssund to Overland (Missouri) | 4,489.81 mi (7,225.65 km) |
| Frederikssund to Overland Park (Kansas) | 4,617.66 mi (7,431.40 km) |
| Frederikssund to Overlea (Maryland) | 3,981.26 mi (6,407.22 km) |
| Frederikssund to Oviedo (Florida) | 4,722.95 mi (7,600.85 km) |
| Frederikssund to Owasso (Oklahoma) | 4,800.43 mi (7,725.54 km) |
| Frederikssund to Owatonna (Minnesota) | 4,284.60 mi (6,895.39 km) |
| Frederikssund to Owensboro (Kentucky) | 4,433.40 mi (7,134.87 km) |
| Frederikssund to Owings Mills (Maryland) | 3,988.53 mi (6,418.92 km) |
| Frederikssund to Owosso (Michigan) | 4,055.51 mi (6,526.71 km) |
