| Healdsburg to Castelfidardo | 6,144.54 mi (9,888.67 km) |
| Healdsburg to Castelfiorentino | 6,065.46 mi (9,761.41 km) |
| Healdsburg to Castelfranco di Sopra | 6,080.71 mi (9,785.96 km) |
| Healdsburg to Castelfranco di Sotto | 6,053.63 mi (9,742.38 km) |
| Healdsburg to Castelfranco Emilia | 6,010.99 mi (9,673.75 km) |
| Healdsburg to Castelfranco Veneto | 5,973.73 mi (9,613.78 km) |
| Healdsburg to Castellabate | 6,369.40 mi (10,250.55 km) |
| Healdsburg to Castellammare del Golfo | 6,441.35 mi (10,366.36 km) |
| Healdsburg to Castellammare di Stabia | 6,331.89 mi (10,190.20 km) |
| Healdsburg to Castellamonte | 5,872.15 mi (9,450.32 km) |
| Healdsburg to Castellana Grotte | 6,393.26 mi (10,288.95 km) |
| Healdsburg to Castellaneta | 6,402.03 mi (10,303.07 km) |
| Healdsburg to Castellanza | 5,893.02 mi (9,483.89 km) |
| Healdsburg to Castellarano | 6,005.21 mi (9,664.45 km) |
| Healdsburg to Castelleone | 5,935.29 mi (9,551.93 km) |
