| Harker Heights to Opwijk | 5,052.99 mi (8,132.00 km) |
| Harker Heights to Ostend | 4,996.22 mi (8,040.65 km) |
| Harker Heights to Oud-Heverlee | 5,075.88 mi (8,168.84 km) |
| Harker Heights to Oud-Turnhout | 5,071.57 mi (8,161.90 km) |
| Harker Heights to Oudenaarde | 5,034.55 mi (8,102.32 km) |
| Harker Heights to Oudenburg | 5,000.68 mi (8,047.82 km) |
| Harker Heights to Oupeye | 5,117.26 mi (8,235.43 km) |
| Harker Heights to Overijse | 5,072.48 mi (8,163.36 km) |
| Harker Heights to Overpelt | 5,091.28 mi (8,193.62 km) |
| Harker Heights to Paal | 5,088.12 mi (8,188.54 km) |
| Harker Heights to Peer | 5,095.53 mi (8,200.47 km) |
| Harker Heights to Pepinster | 5,128.74 mi (8,253.90 km) |
| Harker Heights to Peruwelz | 5,044.89 mi (8,118.97 km) |
| Harker Heights to Perwez | 5,088.60 mi (8,189.32 km) |
| Harker Heights to Philippeville | 5,092.77 mi (8,196.02 km) |
