| Allouez to Oerlinghausen | 4,143.03 mi (6,667.57 km) |
| Allouez to Oestrich-Winkel | 4,197.93 mi (6,755.91 km) |
| Allouez to Offenburg | 4,257.62 mi (6,851.97 km) |
| Allouez to Oftersheim | 4,244.59 mi (6,831.01 km) |
| Allouez to Ohrdruf | 4,261.30 mi (6,857.91 km) |
| Allouez to Ohringen | 4,284.77 mi (6,895.67 km) |
| Allouez to Olbernhau | 4,358.25 mi (7,013.93 km) |
| Allouez to Olching | 4,392.55 mi (7,069.12 km) |
| Allouez to Oldenburg | 4,081.16 mi (6,567.99 km) |
| Allouez to Oldenburg in Holstein | 4,125.34 mi (6,639.09 km) |
| Allouez to Olfen | 4,107.85 mi (6,610.95 km) |
| Allouez to Olpe | 4,151.36 mi (6,680.96 km) |
| Allouez to Olsberg | 4,161.13 mi (6,696.69 km) |
| Allouez to Oranienburg | 4,266.47 mi (6,866.22 km) |
| Allouez to Ortenberg | 4,221.42 mi (6,793.72 km) |
