| Gunbarrel to Nuth | 4,902.71 mi (7,890.16 km) |
| Gunbarrel to Oegstgeest | 4,799.70 mi (7,724.37 km) |
| Gunbarrel to Oirschot | 4,857.30 mi (7,817.07 km) |
| Gunbarrel to Oisterwijk | 4,850.30 mi (7,805.80 km) |
| Gunbarrel to Oldebroek | 4,834.14 mi (7,779.79 km) |
| Gunbarrel to Oldenzaal | 4,873.12 mi (7,842.52 km) |
| Gunbarrel to Ommen | 4,847.62 mi (7,801.49 km) |
| Gunbarrel to Oosterend | 4,814.59 mi (7,748.34 km) |
| Gunbarrel to Oosterhout | 4,836.39 mi (7,783.42 km) |
| Gunbarrel to Oosterwolde | 4,822.30 mi (7,760.74 km) |
| Gunbarrel to Oostzaan | 4,802.17 mi (7,728.35 km) |
| Gunbarrel to Opmeer | 4,792.52 mi (7,712.81 km) |
| Gunbarrel to Oss | 4,852.42 mi (7,809.22 km) |
| Gunbarrel to Oud-Beijerland | 4,813.69 mi (7,746.89 km) |
| Gunbarrel to Oudenbosch | 4,827.83 mi (7,769.65 km) |
