| Sun Prairie to Nuth | 4,190.38 mi (6,743.76 km) |
| Sun Prairie to Oegstgeest | 4,091.78 mi (6,585.09 km) |
| Sun Prairie to Oirschot | 4,147.16 mi (6,674.21 km) |
| Sun Prairie to Oisterwijk | 4,140.43 mi (6,663.38 km) |
| Sun Prairie to Oldebroek | 4,132.96 mi (6,651.35 km) |
| Sun Prairie to Oldenzaal | 4,174.47 mi (6,718.16 km) |
| Sun Prairie to Ommen | 4,148.68 mi (6,676.66 km) |
| Sun Prairie to Oosterend | 4,118.11 mi (6,627.47 km) |
| Sun Prairie to Oosterhout | 4,125.81 mi (6,639.85 km) |
| Sun Prairie to Oosterwolde | 4,126.48 mi (6,640.93 km) |
| Sun Prairie to Oostzaan | 4,097.48 mi (6,594.26 km) |
| Sun Prairie to Opmeer | 4,090.03 mi (6,582.27 km) |
| Sun Prairie to Oss | 4,144.94 mi (6,670.64 km) |
| Sun Prairie to Oud-Beijerland | 4,102.88 mi (6,602.94 km) |
| Sun Prairie to Oudenbosch | 4,115.77 mi (6,623.69 km) |
