| Herk-de-Stad to Oswego (Illinois) | 4,201.99 mi (6,762.45 km) |
| Herk-de-Stad to Oswego (New York) | 3,669.37 mi (5,905.28 km) |
| Herk-de-Stad to Otsego (Minnesota) | 4,219.01 mi (6,789.84 km) |
| Herk-de-Stad to Ottawa (Illinois) | 4,235.92 mi (6,817.05 km) |
| Herk-de-Stad to Ottawa (Kansas) | 4,609.69 mi (7,418.58 km) |
| Herk-de-Stad to Ottumwa (Iowa) | 4,384.48 mi (7,056.13 km) |
| Herk-de-Stad to Overland (Missouri) | 4,423.54 mi (7,118.99 km) |
| Herk-de-Stad to Overland Park (Kansas) | 4,574.04 mi (7,361.21 km) |
| Herk-de-Stad to Overlea (Maryland) | 3,851.29 mi (6,198.05 km) |
| Herk-de-Stad to Oviedo (Florida) | 4,556.64 mi (7,333.20 km) |
| Herk-de-Stad to Owasso (Oklahoma) | 4,749.22 mi (7,643.13 km) |
| Herk-de-Stad to Owatonna (Minnesota) | 4,262.62 mi (6,860.03 km) |
| Herk-de-Stad to Owensboro (Kentucky) | 4,345.70 mi (6,993.73 km) |
| Herk-de-Stad to Owings Mills (Maryland) | 3,860.17 mi (6,212.34 km) |
| Herk-de-Stad to Owosso (Michigan) | 3,984.56 mi (6,412.53 km) |
