| Sonoma to Cividale del Friuli | 5,997.78 mi (9,652.50 km) |
| Sonoma to Civita Castellana | 6,189.05 mi (9,960.31 km) |
| Sonoma to Civitanova Marche | 6,168.00 mi (9,926.44 km) |
| Sonoma to Civitavecchia | 6,182.82 mi (9,950.29 km) |
| Sonoma to Civitella in Val di Chiana | 6,105.23 mi (9,825.42 km) |
| Sonoma to Clusone | 5,915.78 mi (9,520.53 km) |
| Sonoma to Coccaglio | 5,934.57 mi (9,550.77 km) |
| Sonoma to Codigoro | 6,035.37 mi (9,712.99 km) |
| Sonoma to Codogno | 5,949.51 mi (9,574.82 km) |
| Sonoma to Codroipo | 5,993.76 mi (9,646.02 km) |
| Sonoma to Cogoleto | 5,962.05 mi (9,594.99 km) |
| Sonoma to Colle di Val d'Elsa | 6,089.61 mi (9,800.28 km) |
| Sonoma to Colle Salvetti | 6,059.64 mi (9,752.05 km) |
| Sonoma to Collecchio | 5,987.10 mi (9,635.31 km) |
| Sonoma to Colleferro | 6,238.67 mi (10,040.17 km) |
