| Healdsburg to Olivares | 5,820.66 mi (9,367.44 km) |
| Healdsburg to Olivenza | 5,722.01 mi (9,208.68 km) |
| Healdsburg to Olot | 5,884.89 mi (9,470.82 km) |
| Healdsburg to Onate | 5,676.11 mi (9,134.81 km) |
| Healdsburg to Onda | 5,908.24 mi (9,508.39 km) |
| Healdsburg to Onteniente | 5,955.23 mi (9,584.01 km) |
| Healdsburg to Orihuela | 5,981.13 mi (9,625.69 km) |
| Healdsburg to Osuna | 5,869.99 mi (9,446.83 km) |
| Healdsburg to Ourense | 5,516.84 mi (8,878.50 km) |
| Healdsburg to Oviedo | 5,540.14 mi (8,915.99 km) |
| Healdsburg to Paiporta | 5,930.55 mi (9,544.30 km) |
| Healdsburg to Pajara | 5,920.36 mi (9,527.90 km) |
| Healdsburg to Palafolls | 5,920.76 mi (9,528.54 km) |
| Healdsburg to Palafrugell | 5,921.02 mi (9,528.96 km) |
| Healdsburg to Palamos | 5,923.73 mi (9,533.32 km) |
