| Washougal to Collegno | 5,467.25 mi (8,798.69 km) |
| Washougal to Cologno al Serio | 5,493.35 mi (8,840.69 km) |
| Washougal to Cologno Monzese | 5,485.73 mi (8,828.43 km) |
| Washougal to Colorno | 5,549.02 mi (8,930.29 km) |
| Washougal to Comacchio | 5,608.14 mi (9,025.42 km) |
| Washougal to Comiso | 6,136.60 mi (9,875.91 km) |
| Washougal to Como | 5,464.32 mi (8,793.97 km) |
| Washougal to Concordia Sagittaria | 5,560.72 mi (8,949.11 km) |
| Washougal to Concorezzo | 5,483.64 mi (8,825.07 km) |
| Washougal to Conegliano | 5,540.17 mi (8,916.04 km) |
| Washougal to Conselice | 5,610.34 mi (9,028.97 km) |
| Washougal to Conselve | 5,568.53 mi (8,961.68 km) |
| Washougal to Conversano | 5,954.32 mi (9,582.56 km) |
| Washougal to Copertino | 6,019.57 mi (9,687.57 km) |
| Washougal to Copparo | 5,587.53 mi (8,992.26 km) |
