| Healdsburg to Castelletto sopra Ticino | 5,879.87 mi (9,462.74 km) |
| Healdsburg to Castelli Calepio | 5,920.11 mi (9,527.49 km) |
| Healdsburg to Castelnovo ne' Monti | 6,002.06 mi (9,659.39 km) |
| Healdsburg to Castelnuovo Berardenga | 6,095.03 mi (9,809.01 km) |
| Healdsburg to Castelnuovo di Porto | 6,192.86 mi (9,966.44 km) |
| Healdsburg to Castelnuovo di Verona | 5,955.40 mi (9,584.29 km) |
| Healdsburg to Castelnuovo Rangone | 6,010.33 mi (9,672.70 km) |
| Healdsburg to Castelvetrano | 6,458.60 mi (10,394.11 km) |
| Healdsburg to Castelvetro di Modena | 6,013.65 mi (9,678.03 km) |
| Healdsburg to Castenaso | 6,027.51 mi (9,700.34 km) |
| Healdsburg to Castenedolo | 5,940.33 mi (9,560.04 km) |
| Healdsburg to Castiglion Fiorentino | 6,106.83 mi (9,828.00 km) |
| Healdsburg to Castiglione del Lago | 6,122.23 mi (9,852.78 km) |
| Healdsburg to Castiglione delle Stiviere | 5,949.95 mi (9,575.52 km) |
| Healdsburg to Castrolibero | 6,460.58 mi (10,397.30 km) |
