| Herk-de-Stad to Oakley (California) | 5,501.61 mi (8,853.98 km) |
| Herk-de-Stad to Oakton (Virginia) | 3,904.55 mi (6,283.76 km) |
| Herk-de-Stad to Oakville (Missouri) | 4,434.01 mi (7,135.85 km) |
| Herk-de-Stad to Oatfield (Oregon) | 5,086.17 mi (8,185.41 km) |
| Herk-de-Stad to Ocala (Florida) | 4,570.71 mi (7,355.85 km) |
| Herk-de-Stad to Ocean Acres (New Jersey) | 3,743.78 mi (6,025.03 km) |
| Herk-de-Stad to Ocean City (New Jersey) | 3,778.09 mi (6,080.25 km) |
| Herk-de-Stad to Ocean Pines (Maryland) | 3,840.25 mi (6,180.29 km) |
| Herk-de-Stad to Ocean Pointe (Hawaii) | 7,340.69 mi (11,813.69 km) |
| Herk-de-Stad to Ocean Springs (Mississippi) | 4,779.34 mi (7,691.60 km) |
| Herk-de-Stad to Oceanside (California) | 5,652.63 mi (9,097.03 km) |
| Herk-de-Stad to Oceanside (New York) | 3,678.29 mi (5,919.63 km) |
| Herk-de-Stad to Ocoee (Florida) | 4,575.01 mi (7,362.76 km) |
| Herk-de-Stad to Oconomowoc (Wisconsin) | 4,140.26 mi (6,663.11 km) |
| Herk-de-Stad to Odenton (Maryland) | 3,871.94 mi (6,231.29 km) |
