| Harker Heights to Oberkirch | 5,288.21 mi (8,510.56 km) |
| Harker Heights to Obernburg am Main | 5,280.46 mi (8,498.09 km) |
| Harker Heights to Obernkirchen | 5,190.26 mi (8,352.92 km) |
| Harker Heights to Oberschleissheim | 5,432.64 mi (8,742.99 km) |
| Harker Heights to Oberstdorf | 5,415.65 mi (8,715.65 km) |
| Harker Heights to Obertraubling | 5,427.19 mi (8,734.22 km) |
| Harker Heights to Obertshausen | 5,260.51 mi (8,465.98 km) |
| Harker Heights to Oberursel | 5,245.88 mi (8,442.43 km) |
| Harker Heights to Ochsenfurt | 5,322.30 mi (8,565.42 km) |
| Harker Heights to Ochsenhausen | 5,377.55 mi (8,654.33 km) |
| Harker Heights to Ochtrup | 5,122.72 mi (8,244.22 km) |
| Harker Heights to Odenthal | 5,161.36 mi (8,306.41 km) |
| Harker Heights to Oelde | 5,170.94 mi (8,321.83 km) |
| Harker Heights to Oelsnitz | 5,370.32 mi (8,642.69 km) |
| Harker Heights to Oer-Erkenschwick | 5,144.80 mi (8,279.75 km) |
