| Onalaska to Nuth | 4,227.23 mi (6,803.06 km) |
| Onalaska to Oegstgeest | 4,127.45 mi (6,642.49 km) |
| Onalaska to Oirschot | 4,183.43 mi (6,732.58 km) |
| Onalaska to Oisterwijk | 4,176.63 mi (6,721.63 km) |
| Onalaska to Oldebroek | 4,167.14 mi (6,706.36 km) |
| Onalaska to Oldenzaal | 4,208.14 mi (6,772.34 km) |
| Onalaska to Ommen | 4,182.38 mi (6,730.89 km) |
| Onalaska to Oosterend | 4,151.20 mi (6,680.71 km) |
| Onalaska to Oosterhout | 4,162.15 mi (6,698.33 km) |
| Onalaska to Oosterwolde | 4,159.43 mi (6,693.96 km) |
| Onalaska to Oostzaan | 4,132.41 mi (6,650.47 km) |
| Onalaska to Opmeer | 4,124.44 mi (6,637.65 km) |
| Onalaska to Oss | 4,180.59 mi (6,728.01 km) |
| Onalaska to Oud-Beijerland | 4,139.24 mi (6,661.46 km) |
| Onalaska to Oudenbosch | 4,152.44 mi (6,682.71 km) |
