| Milwaukee to Oerlinghausen | 4,210.12 mi (6,775.53 km) |
| Milwaukee to Oestrich-Winkel | 4,262.35 mi (6,859.59 km) |
| Milwaukee to Offenburg | 4,320.18 mi (6,952.65 km) |
| Milwaukee to Oftersheim | 4,308.59 mi (6,934.00 km) |
| Milwaukee to Ohrdruf | 4,328.13 mi (6,965.45 km) |
| Milwaukee to Ohringen | 4,349.07 mi (6,999.15 km) |
| Milwaukee to Olbernhau | 4,426.26 mi (7,123.38 km) |
| Milwaukee to Olching | 4,456.73 mi (7,172.42 km) |
| Milwaukee to Oldenburg | 4,149.40 mi (6,677.82 km) |
| Milwaukee to Oldenburg in Holstein | 4,196.11 mi (6,752.99 km) |
| Milwaukee to Olfen | 4,174.01 mi (6,717.42 km) |
| Milwaukee to Olpe | 4,216.90 mi (6,786.45 km) |
| Milwaukee to Olsberg | 4,227.40 mi (6,803.35 km) |
| Milwaukee to Oranienburg | 4,336.66 mi (6,979.18 km) |
| Milwaukee to Ortenberg | 4,286.83 mi (6,898.98 km) |
