| Glendale Heights to Oberkirch | 4,380.61 mi (7,049.91 km) |
| Glendale Heights to Obernburg am Main | 4,369.38 mi (7,031.83 km) |
| Glendale Heights to Obernkirchen | 4,275.48 mi (6,880.72 km) |
| Glendale Heights to Oberschleissheim | 4,522.46 mi (7,278.20 km) |
| Glendale Heights to Oberstdorf | 4,508.34 mi (7,255.47 km) |
| Glendale Heights to Obertraubling | 4,515.29 mi (7,266.66 km) |
| Glendale Heights to Obertshausen | 4,349.25 mi (6,999.45 km) |
| Glendale Heights to Oberursel | 4,334.57 mi (6,975.81 km) |
| Glendale Heights to Ochsenfurt | 4,410.85 mi (7,098.57 km) |
| Glendale Heights to Ochsenhausen | 4,469.17 mi (7,192.44 km) |
| Glendale Heights to Ochtrup | 4,209.03 mi (6,773.79 km) |
| Glendale Heights to Odenthal | 4,249.62 mi (6,839.10 km) |
| Glendale Heights to Oelde | 4,257.27 mi (6,851.41 km) |
| Glendale Heights to Oelsnitz | 4,456.28 mi (7,171.69 km) |
| Glendale Heights to Oer-Erkenschwick | 4,231.94 mi (6,810.66 km) |
