| Onalaska to Oerlinghausen | 4,281.87 mi (6,891.00 km) |
| Onalaska to Oestrich-Winkel | 4,339.77 mi (6,984.18 km) |
| Onalaska to Offenburg | 4,401.40 mi (7,083.36 km) |
| Onalaska to Oftersheim | 4,386.87 mi (7,059.99 km) |
| Onalaska to Ohrdruf | 4,400.38 mi (7,081.73 km) |
| Onalaska to Ohringen | 4,426.70 mi (7,124.09 km) |
| Onalaska to Olbernhau | 4,495.84 mi (7,235.35 km) |
| Onalaska to Olching | 4,534.55 mi (7,297.66 km) |
| Onalaska to Oldenburg | 4,218.61 mi (6,789.20 km) |
| Onalaska to Oldenburg in Holstein | 4,259.45 mi (6,854.92 km) |
| Onalaska to Olfen | 4,247.80 mi (6,836.18 km) |
| Onalaska to Olpe | 4,291.98 mi (6,907.27 km) |
| Onalaska to Olsberg | 4,300.92 mi (6,921.65 km) |
| Onalaska to Oranienburg | 4,401.29 mi (7,083.18 km) |
| Onalaska to Ortenberg | 4,362.17 mi (7,020.23 km) |
