| Harker Heights to Opole | 5,563.78 mi (8,954.04 km) |
| Harker Heights to Orzesze | 5,614.17 mi (9,035.13 km) |
| Harker Heights to Osowa | 5,420.25 mi (8,723.04 km) |
| Harker Heights to Ostroda | 5,499.00 mi (8,849.79 km) |
| Harker Heights to Ostroleka | 5,577.62 mi (8,976.31 km) |
| Harker Heights to Ostrow Mazowiecka | 5,600.17 mi (9,012.61 km) |
| Harker Heights to Ostrow Wielkopolski | 5,517.70 mi (8,879.88 km) |
| Harker Heights to Ostrowiec Swietokrzyski | 5,668.59 mi (9,122.71 km) |
| Harker Heights to Ostrzeszow | 5,531.61 mi (8,902.26 km) |
| Harker Heights to Oswiecim | 5,635.24 mi (9,069.05 km) |
| Harker Heights to Otwock | 5,610.87 mi (9,029.82 km) |
| Harker Heights to Ozarow Mazowiecki | 5,591.34 mi (8,998.39 km) |
| Harker Heights to Ozimek | 5,573.09 mi (8,969.02 km) |
| Harker Heights to Ozorkow | 5,552.89 mi (8,936.51 km) |
| Harker Heights to Pabianice | 5,570.05 mi (8,964.12 km) |
