| Healdsburg to Noventa Vicentina | 5,984.92 mi (9,631.80 km) |
| Healdsburg to Novi di Modena | 5,989.86 mi (9,639.75 km) |
| Healdsburg to Novi Ligure | 5,937.81 mi (9,555.98 km) |
| Healdsburg to Nuoro | 6,203.68 mi (9,983.85 km) |
| Healdsburg to Occhiobello | 6,006.95 mi (9,667.25 km) |
| Healdsburg to Oderzo | 5,982.07 mi (9,627.22 km) |
| Healdsburg to Oggiono | 5,896.31 mi (9,489.20 km) |
| Healdsburg to Olbia | 6,174.90 mi (9,937.54 km) |
| Healdsburg to Oleggio | 5,886.40 mi (9,473.24 km) |
| Healdsburg to Olgiate Comasco | 5,885.56 mi (9,471.89 km) |
| Healdsburg to Olgiate Olona | 5,891.61 mi (9,481.64 km) |
| Healdsburg to Omegna | 5,864.44 mi (9,437.90 km) |
| Healdsburg to Opera | 5,915.06 mi (9,519.37 km) |
| Healdsburg to Oppeano | 5,974.42 mi (9,614.90 km) |
| Healdsburg to Orbassano | 5,887.85 mi (9,475.57 km) |
