| Hoffman Estates to Oberkirch | 4,376.44 mi (7,043.20 km) |
| Hoffman Estates to Obernburg am Main | 4,364.93 mi (7,024.68 km) |
| Hoffman Estates to Obernkirchen | 4,270.66 mi (6,872.97 km) |
| Hoffman Estates to Oberschleissheim | 4,518.09 mi (7,271.16 km) |
| Hoffman Estates to Oberstdorf | 4,504.18 mi (7,248.78 km) |
| Hoffman Estates to Obertraubling | 4,510.77 mi (7,259.38 km) |
| Hoffman Estates to Obertshausen | 4,344.79 mi (6,992.27 km) |
| Hoffman Estates to Oberursel | 4,330.10 mi (6,968.63 km) |
| Hoffman Estates to Ochsenfurt | 4,406.37 mi (7,091.37 km) |
| Hoffman Estates to Ochsenhausen | 4,464.94 mi (7,185.63 km) |
| Hoffman Estates to Ochtrup | 4,204.34 mi (6,766.24 km) |
| Hoffman Estates to Odenthal | 4,245.12 mi (6,831.86 km) |
| Hoffman Estates to Oelde | 4,252.58 mi (6,843.87 km) |
| Hoffman Estates to Oelsnitz | 4,451.54 mi (7,164.07 km) |
| Hoffman Estates to Oer-Erkenschwick | 4,227.34 mi (6,803.25 km) |
