| Wauwatosa to Oerlinghausen | 4,212.62 mi (6,779.56 km) |
| Wauwatosa to Oestrich-Winkel | 4,264.94 mi (6,863.75 km) |
| Wauwatosa to Offenburg | 4,322.82 mi (6,956.90 km) |
| Wauwatosa to Oftersheim | 4,311.19 mi (6,938.18 km) |
| Wauwatosa to Ohrdruf | 4,330.64 mi (6,969.50 km) |
| Wauwatosa to Ohringen | 4,351.66 mi (7,003.32 km) |
| Wauwatosa to Olbernhau | 4,428.73 mi (7,127.36 km) |
| Wauwatosa to Olching | 4,459.33 mi (7,176.60 km) |
| Wauwatosa to Oldenburg | 4,151.87 mi (6,681.79 km) |
| Wauwatosa to Oldenburg in Holstein | 4,198.49 mi (6,756.82 km) |
| Wauwatosa to Olfen | 4,176.54 mi (6,721.49 km) |
| Wauwatosa to Olpe | 4,219.45 mi (6,790.55 km) |
| Wauwatosa to Olsberg | 4,229.93 mi (6,807.42 km) |
| Wauwatosa to Oranienburg | 4,339.06 mi (6,983.04 km) |
| Wauwatosa to Ortenberg | 4,289.38 mi (6,903.10 km) |
