| Gretna to Clacton-on-Sea | 4,672.66 mi (7,519.92 km) |
| Gretna to Clay Cross | 4,539.78 mi (7,306.07 km) |
| Gretna to Clayton | 4,511.05 mi (7,259.83 km) |
| Gretna to Clayton le Moors | 4,488.95 mi (7,224.27 km) |
| Gretna to Cleckheaton | 4,515.91 mi (7,267.66 km) |
| Gretna to Cleethorpes | 4,585.67 mi (7,379.92 km) |
| Gretna to Clevedon | 4,518.52 mi (7,271.85 km) |
| Gretna to Clifton | 4,554.69 mi (7,330.07 km) |
| Gretna to Clifton | 4,534.81 mi (7,298.08 km) |
| Gretna to Cliftonville | 4,692.87 mi (7,552.45 km) |
| Gretna to Clitheroe | 4,486.71 mi (7,220.65 km) |
| Gretna to Clydebank | 4,371.67 mi (7,035.52 km) |
| Gretna to Coalville | 4,550.98 mi (7,324.10 km) |
| Gretna to Coatbridge | 4,386.34 mi (7,059.14 km) |
| Gretna to Cobham | 4,620.82 mi (7,436.49 km) |
