| Herk-de-Stad to Odessa (Texas) | 5,221.81 mi (8,403.69 km) |
| Herk-de-Stad to Ogden (Utah) | 5,030.43 mi (8,095.69 km) |
| Herk-de-Stad to Oildale (California) | 5,576.05 mi (8,973.79 km) |
| Herk-de-Stad to Ojus (Florida) | 4,649.54 mi (7,482.71 km) |
| Herk-de-Stad to Okemos (Michigan) | 4,006.89 mi (6,448.46 km) |
| Herk-de-Stad to Oklahoma City (Oklahoma) | 4,853.89 mi (7,811.58 km) |
| Herk-de-Stad to Okmulgee (Oklahoma) | 4,790.64 mi (7,709.79 km) |
| Herk-de-Stad to Olathe (Kansas) | 4,579.08 mi (7,369.32 km) |
| Herk-de-Stad to Old Jamestown (Missouri) | 4,413.30 mi (7,102.53 km) |
| Herk-de-Stad to Oldsmar (Florida) | 4,648.99 mi (7,481.83 km) |
| Herk-de-Stad to Olean (New York) | 3,805.16 mi (6,123.81 km) |
| Herk-de-Stad to Olive Branch (Mississippi) | 4,590.12 mi (7,387.09 km) |
| Herk-de-Stad to Olivehurst (California) | 5,433.35 mi (8,744.13 km) |
| Herk-de-Stad to Olney (Maryland) | 3,883.50 mi (6,249.89 km) |
| Herk-de-Stad to Olympia (Washington) | 4,997.52 mi (8,042.74 km) |
