| Harker Heights to Oerlinghausen | 5,184.91 mi (8,344.30 km) |
| Harker Heights to Oestrich-Winkel | 5,231.56 mi (8,419.39 km) |
| Harker Heights to Offenburg | 5,284.82 mi (8,505.10 km) |
| Harker Heights to Oftersheim | 5,276.74 mi (8,492.10 km) |
| Harker Heights to Ohrdruf | 5,302.29 mi (8,533.22 km) |
| Harker Heights to Ohringen | 5,317.86 mi (8,558.28 km) |
| Harker Heights to Olbernhau | 5,402.51 mi (8,694.50 km) |
| Harker Heights to Olching | 5,425.09 mi (8,730.83 km) |
| Harker Heights to Oldenburg | 5,126.31 mi (8,250.00 km) |
| Harker Heights to Oldenburg in Holstein | 5,176.75 mi (8,331.17 km) |
| Harker Heights to Olfen | 5,147.04 mi (8,283.36 km) |
| Harker Heights to Olpe | 5,188.63 mi (8,350.29 km) |
| Harker Heights to Olsberg | 5,200.60 mi (8,369.55 km) |
| Harker Heights to Oranienburg | 5,316.44 mi (8,555.98 km) |
| Harker Heights to Ortenberg | 5,258.15 mi (8,462.18 km) |
