| Frederikssund to Olympia Heights (Florida) | 4,853.91 mi (7,811.62 km) |
| Frederikssund to Omaha (Nebraska) | 4,526.91 mi (7,285.35 km) |
| Frederikssund to On Top of the World Designated Place (Florida) | 4,738.32 mi (7,625.59 km) |
| Frederikssund to Onalaska (Wisconsin) | 4,233.40 mi (6,813.00 km) |
| Frederikssund to Oneida (New York) | 3,762.40 mi (6,054.99 km) |
| Frederikssund to Oneonta (New York) | 3,772.73 mi (6,071.62 km) |
| Frederikssund to Ontario (California) | 5,557.97 mi (8,944.69 km) |
| Frederikssund to Ontario (Oregon) | 4,926.08 mi (7,927.77 km) |
| Frederikssund to Opa-locka (Florida) | 4,841.07 mi (7,790.94 km) |
| Frederikssund to Opelika (Alabama) | 4,652.68 mi (7,487.77 km) |
| Frederikssund to Opelousas (Louisiana) | 5,003.86 mi (8,052.94 km) |
| Frederikssund to Orange (California) | 5,578.01 mi (8,976.94 km) |
| Frederikssund to Orange (Texas) | 5,083.58 mi (8,181.23 km) |
| Frederikssund to Orange City (Florida) | 4,711.39 mi (7,582.24 km) |
| Frederikssund to Orangeburg (South Carolina) | 4,447.27 mi (7,157.18 km) |
