| Buffalo Grove to Oberkirch | 4,364.61 mi (7,024.16 km) |
| Buffalo Grove to Obernburg am Main | 4,353.14 mi (7,005.70 km) |
| Buffalo Grove to Obernkirchen | 4,258.93 mi (6,854.09 km) |
| Buffalo Grove to Oberschleissheim | 4,506.28 mi (7,252.16 km) |
| Buffalo Grove to Oberstdorf | 4,492.35 mi (7,229.74 km) |
| Buffalo Grove to Obertraubling | 4,498.99 mi (7,240.42 km) |
| Buffalo Grove to Obertshausen | 4,333.00 mi (6,973.29 km) |
| Buffalo Grove to Oberursel | 4,318.31 mi (6,949.65 km) |
| Buffalo Grove to Ochsenfurt | 4,394.58 mi (7,072.39 km) |
| Buffalo Grove to Ochsenhausen | 4,453.12 mi (7,166.60 km) |
| Buffalo Grove to Ochtrup | 4,192.59 mi (6,747.32 km) |
| Buffalo Grove to Odenthal | 4,233.33 mi (6,812.89 km) |
| Buffalo Grove to Oelde | 4,240.83 mi (6,824.95 km) |
| Buffalo Grove to Oelsnitz | 4,439.80 mi (7,145.17 km) |
| Buffalo Grove to Oer-Erkenschwick | 4,215.57 mi (6,784.31 km) |
