| Healdsburg to Nuth | 5,517.12 mi (8,878.95 km) |
| Healdsburg to Oegstgeest | 5,410.79 mi (8,707.82 km) |
| Healdsburg to Oirschot | 5,469.86 mi (8,802.89 km) |
| Healdsburg to Oisterwijk | 5,462.68 mi (8,791.34 km) |
| Healdsburg to Oldebroek | 5,434.46 mi (8,745.91 km) |
| Healdsburg to Oldenzaal | 5,468.57 mi (8,800.81 km) |
| Healdsburg to Ommen | 5,444.29 mi (8,761.74 km) |
| Healdsburg to Oosterend | 5,408.80 mi (8,704.62 km) |
| Healdsburg to Oosterhout | 5,450.22 mi (8,771.29 km) |
| Healdsburg to Oosterwolde | 5,415.32 mi (8,715.11 km) |
| Healdsburg to Oostzaan | 5,408.55 mi (8,704.21 km) |
| Healdsburg to Opmeer | 5,396.02 mi (8,684.05 km) |
| Healdsburg to Oss | 5,461.28 mi (8,789.08 km) |
| Healdsburg to Oud-Beijerland | 5,428.57 mi (8,736.44 km) |
| Healdsburg to Oudenbosch | 5,444.09 mi (8,761.42 km) |
