| Lake Ronkonkoma to Cividale del Friuli | 4,133.18 mi (6,651.71 km) |
| Lake Ronkonkoma to Civita Castellana | 4,219.80 mi (6,791.11 km) |
| Lake Ronkonkoma to Civitanova Marche | 4,242.32 mi (6,827.35 km) |
| Lake Ronkonkoma to Civitavecchia | 4,199.71 mi (6,758.78 km) |
| Lake Ronkonkoma to Civitella in Val di Chiana | 4,150.64 mi (6,679.81 km) |
| Lake Ronkonkoma to Clusone | 3,992.99 mi (6,426.09 km) |
| Lake Ronkonkoma to Coccaglio | 4,004.41 mi (6,444.47 km) |
| Lake Ronkonkoma to Codigoro | 4,119.98 mi (6,630.47 km) |
| Lake Ronkonkoma to Codogno | 4,005.58 mi (6,446.36 km) |
| Lake Ronkonkoma to Codroipo | 4,118.74 mi (6,628.47 km) |
| Lake Ronkonkoma to Cogoleto | 3,984.27 mi (6,412.07 km) |
| Lake Ronkonkoma to Colle di Val d'Elsa | 4,125.71 mi (6,639.69 km) |
| Lake Ronkonkoma to Colle Salvetti | 4,090.53 mi (6,583.07 km) |
| Lake Ronkonkoma to Collecchio | 4,040.96 mi (6,503.29 km) |
| Lake Ronkonkoma to Colleferro | 4,266.44 mi (6,866.18 km) |
