| Port Glasgow to Cocentaina | 1,203.63 mi (1,937.06 km) |
| Port Glasgow to Coin | 1,331.24 mi (2,142.43 km) |
| Port Glasgow to Colindres | 867.99 mi (1,396.89 km) |
| Port Glasgow to Collado-Villalba | 1,057.63 mi (1,702.09 km) |
| Port Glasgow to Colmenar Viejo | 1,056.24 mi (1,699.85 km) |
| Port Glasgow to Colmenarejo | 1,062.62 mi (1,710.13 km) |
| Port Glasgow to Conil de la Frontera | 1,360.45 mi (2,189.43 km) |
| Port Glasgow to Consuegra | 1,139.19 mi (1,833.35 km) |
| Port Glasgow to Corbera de Llobregat | 1,046.38 mi (1,683.98 km) |
| Port Glasgow to Cordoba | 1,247.11 mi (2,007.02 km) |
| Port Glasgow to Coria del Rio | 1,290.19 mi (2,076.36 km) |
| Port Glasgow to Crevillente | 1,235.03 mi (1,987.58 km) |
| Port Glasgow to Cuarte de Huerva | 1,005.95 mi (1,618.91 km) |
| Port Glasgow to Cubellas | 1,057.02 mi (1,701.11 km) |
| Port Glasgow to Cuellar | 1,004.28 mi (1,616.24 km) |
