| Herk-de-Stad to Orangevale (California) | 5,447.20 mi (8,766.41 km) |
| Herk-de-Stad to Orchards (Washington) | 5,068.26 mi (8,156.58 km) |
| Herk-de-Stad to Orcutt (California) | 5,650.16 mi (9,093.05 km) |
| Herk-de-Stad to Oregon (Ohio) | 4,018.35 mi (6,466.91 km) |
| Herk-de-Stad to Oregon (Wisconsin) | 4,181.29 mi (6,729.13 km) |
| Herk-de-Stad to Oregon City (Oregon) | 5,090.31 mi (8,192.06 km) |
| Herk-de-Stad to Orem (Utah) | 5,074.20 mi (8,166.14 km) |
| Herk-de-Stad to Orinda (California) | 5,521.73 mi (8,886.37 km) |
| Herk-de-Stad to Orland Park (Illinois) | 4,187.92 mi (6,739.81 km) |
| Herk-de-Stad to Orlando (Florida) | 4,571.95 mi (7,357.84 km) |
| Herk-de-Stad to Ormond Beach (Florida) | 4,521.03 mi (7,275.89 km) |
| Herk-de-Stad to Oro Valley (Arizona) | 5,494.15 mi (8,841.98 km) |
| Herk-de-Stad to Oroville (California) | 5,408.65 mi (8,704.38 km) |
| Herk-de-Stad to Oshkosh (Wisconsin) | 4,099.04 mi (6,596.77 km) |
| Herk-de-Stad to Oskaloosa (Iowa) | 4,379.05 mi (7,047.39 km) |
