| Harker Heights to Octeville | 4,866.02 mi (7,831.10 km) |
| Harker Heights to Oignies | 5,023.63 mi (8,084.76 km) |
| Harker Heights to Oissel | 4,984.82 mi (8,022.29 km) |
| Harker Heights to Olivet | 5,064.96 mi (8,151.27 km) |
| Harker Heights to Ollioules | 5,393.29 mi (8,679.66 km) |
| Harker Heights to Olonne-sur-Mer | 4,953.32 mi (7,971.59 km) |
| Harker Heights to Oloron-Sainte-Marie | 5,108.96 mi (8,222.08 km) |
| Harker Heights to Onet Village | 5,210.41 mi (8,385.35 km) |
| Harker Heights to Onnaing | 5,049.72 mi (8,126.74 km) |
| Harker Heights to Orange | 5,313.16 mi (8,550.71 km) |
| Harker Heights to Orchies | 5,033.16 mi (8,100.09 km) |
| Harker Heights to Orleans | 5,064.05 mi (8,149.79 km) |
| Harker Heights to Orly | 5,056.21 mi (8,137.18 km) |
| Harker Heights to Ormesson-sur-Marne | 5,060.67 mi (8,144.36 km) |
| Harker Heights to Orsay | 5,049.45 mi (8,126.30 km) |
