| Herndon to Cividale del Friuli | 4,390.74 mi (7,066.21 km) |
| Herndon to Civita Castellana | 4,479.45 mi (7,208.98 km) |
| Herndon to Civitanova Marche | 4,501.36 mi (7,244.24 km) |
| Herndon to Civitavecchia | 4,459.52 mi (7,176.90 km) |
| Herndon to Civitella in Val di Chiana | 4,410.00 mi (7,097.20 km) |
| Herndon to Clusone | 4,251.49 mi (6,842.11 km) |
| Herndon to Coccaglio | 4,263.08 mi (6,860.76 km) |
| Herndon to Codigoro | 4,378.60 mi (7,046.68 km) |
| Herndon to Codogno | 4,264.52 mi (6,863.08 km) |
| Herndon to Codroipo | 4,376.51 mi (7,043.31 km) |
| Herndon to Cogoleto | 4,243.73 mi (6,829.62 km) |
| Herndon to Colle di Val d'Elsa | 4,385.17 mi (7,057.25 km) |
| Herndon to Colle Salvetti | 4,350.01 mi (7,000.66 km) |
| Herndon to Collecchio | 4,299.99 mi (6,920.17 km) |
| Herndon to Colleferro | 4,526.19 mi (7,284.21 km) |
