| Union City to Nuth | 5,554.91 mi (8,939.76 km) |
| Union City to Oegstgeest | 5,448.74 mi (8,768.90 km) |
| Union City to Oirschot | 5,507.76 mi (8,863.89 km) |
| Union City to Oisterwijk | 5,500.59 mi (8,852.34 km) |
| Union City to Oldebroek | 5,473.53 mi (8,808.80 km) |
| Union City to Oldenzaal | 5,508.18 mi (8,864.56 km) |
| Union City to Ommen | 5,483.75 mi (8,825.24 km) |
| Union City to Oosterend | 5,448.44 mi (8,768.42 km) |
| Union City to Oosterhout | 5,487.96 mi (8,832.02 km) |
| Union City to Oosterwolde | 5,455.09 mi (8,779.12 km) |
| Union City to Oostzaan | 5,446.97 mi (8,766.05 km) |
| Union City to Opmeer | 5,434.71 mi (8,746.32 km) |
| Union City to Oss | 5,499.54 mi (8,850.65 km) |
| Union City to Oud-Beijerland | 5,466.16 mi (8,796.94 km) |
| Union City to Oudenbosch | 5,481.57 mi (8,821.73 km) |
