| Grefrath to Cologno al Serio | 426.14 mi (685.80 km) |
| Grefrath to Cologno Monzese | 423.18 mi (681.04 km) |
| Grefrath to Colorno | 479.88 mi (772.30 km) |
| Grefrath to Comacchio | 531.73 mi (855.73 km) |
| Grefrath to Comiso | 1,073.40 mi (1,727.48 km) |
| Grefrath to Como | 401.83 mi (646.69 km) |
| Grefrath to Concordia Sagittaria | 486.13 mi (782.35 km) |
| Grefrath to Concorezzo | 420.00 mi (675.93 km) |
| Grefrath to Conegliano | 464.22 mi (747.10 km) |
| Grefrath to Conselice | 535.07 mi (861.11 km) |
| Grefrath to Conselve | 491.97 mi (791.76 km) |
| Grefrath to Conversano | 880.83 mi (1,417.56 km) |
| Grefrath to Copertino | 947.83 mi (1,525.38 km) |
| Grefrath to Copparo | 511.47 mi (823.13 km) |
| Grefrath to Corato | 850.58 mi (1,368.87 km) |
