| Harker Heights to Nuth | 5,119.16 mi (8,238.49 km) |
| Harker Heights to Oegstgeest | 5,023.22 mi (8,084.10 km) |
| Harker Heights to Oirschot | 5,077.25 mi (8,171.05 km) |
| Harker Heights to Oisterwijk | 5,070.68 mi (8,160.47 km) |
| Harker Heights to Oldebroek | 5,067.12 mi (8,154.73 km) |
| Harker Heights to Oldenzaal | 5,109.46 mi (8,222.88 km) |
| Harker Heights to Ommen | 5,083.69 mi (8,181.41 km) |
| Harker Heights to Oosterend | 5,054.27 mi (8,134.07 km) |
| Harker Heights to Oosterhout | 5,055.82 mi (8,136.55 km) |
| Harker Heights to Oosterwolde | 5,062.86 mi (8,147.88 km) |
| Harker Heights to Oostzaan | 5,030.32 mi (8,095.53 km) |
| Harker Heights to Opmeer | 5,023.87 mi (8,085.14 km) |
| Harker Heights to Oss | 5,076.27 mi (8,169.47 km) |
| Harker Heights to Oud-Beijerland | 5,032.90 mi (8,099.68 km) |
| Harker Heights to Oudenbosch | 5,045.13 mi (8,119.35 km) |
