| Milwaukee to Oberkirch | 4,323.16 mi (6,957.45 km) |
| Milwaukee to Obernburg am Main | 4,310.38 mi (6,936.88 km) |
| Milwaukee to Obernkirchen | 4,214.44 mi (6,782.48 km) |
| Milwaukee to Oberschleissheim | 4,463.84 mi (7,183.85 km) |
| Milwaukee to Oberstdorf | 4,450.95 mi (7,163.12 km) |
| Milwaukee to Obertraubling | 4,455.84 mi (7,170.98 km) |
| Milwaukee to Obertshausen | 4,290.18 mi (6,904.37 km) |
| Milwaukee to Oberursel | 4,275.47 mi (6,880.70 km) |
| Milwaukee to Ochsenfurt | 4,351.65 mi (7,003.31 km) |
| Milwaukee to Ochsenhausen | 4,411.36 mi (7,099.40 km) |
| Milwaukee to Ochtrup | 4,148.70 mi (6,676.68 km) |
| Milwaukee to Odenthal | 4,190.33 mi (6,743.68 km) |
| Milwaukee to Oelde | 4,196.92 mi (6,754.30 km) |
| Milwaukee to Oelsnitz | 4,395.66 mi (7,074.14 km) |
| Milwaukee to Oer-Erkenschwick | 4,172.08 mi (6,714.31 km) |
