| Sidney to Nuth | 4,138.62 mi (6,660.47 km) |
| Sidney to Oegstgeest | 4,044.33 mi (6,508.72 km) |
| Sidney to Oirschot | 4,097.48 mi (6,594.26 km) |
| Sidney to Oisterwijk | 4,091.01 mi (6,583.85 km) |
| Sidney to Oldebroek | 4,089.91 mi (6,582.07 km) |
| Sidney to Oldenzaal | 4,132.77 mi (6,651.05 km) |
| Sidney to Ommen | 4,107.06 mi (6,609.68 km) |
| Sidney to Oosterend | 4,078.57 mi (6,563.83 km) |
| Sidney to Oosterhout | 4,076.04 mi (6,559.75 km) |
| Sidney to Oosterwolde | 4,087.31 mi (6,577.89 km) |
| Sidney to Oostzaan | 4,052.30 mi (6,521.54 km) |
| Sidney to Opmeer | 4,046.53 mi (6,512.25 km) |
| Sidney to Oss | 4,097.22 mi (6,593.84 km) |
| Sidney to Oud-Beijerland | 4,053.17 mi (6,522.95 km) |
| Sidney to Oudenbosch | 4,065.01 mi (6,542.00 km) |
