| Healdsburg to Cortona | 6,112.69 mi (9,837.42 km) |
| Healdsburg to Cosenza | 6,462.94 mi (10,401.10 km) |
| Healdsburg to Cossato | 5,874.96 mi (9,454.83 km) |
| Healdsburg to Costa Volpino | 5,914.46 mi (9,518.41 km) |
| Healdsburg to Creazzo | 5,969.25 mi (9,606.57 km) |
| Healdsburg to Crema | 5,929.12 mi (9,541.99 km) |
| Healdsburg to Cremona | 5,952.10 mi (9,578.98 km) |
| Healdsburg to Crevalcore | 6,006.83 mi (9,667.05 km) |
| Healdsburg to Crispiano | 6,411.93 mi (10,319.01 km) |
| Healdsburg to Crosia | 6,461.14 mi (10,398.20 km) |
| Healdsburg to Crotone | 6,499.42 mi (10,459.80 km) |
| Healdsburg to Cuneo | 5,922.83 mi (9,531.87 km) |
| Healdsburg to Cuorgne | 5,869.92 mi (9,446.73 km) |
| Healdsburg to Cusano Milanino | 5,904.75 mi (9,502.78 km) |
| Healdsburg to Cutro | 6,498.80 mi (10,458.80 km) |
