| Helena to Clacton-on-Sea | 4,573.34 mi (7,360.09 km) |
| Helena to Clay Cross | 4,430.26 mi (7,129.81 km) |
| Helena to Clayton | 4,388.68 mi (7,062.90 km) |
| Helena to Clayton le Moors | 4,372.19 mi (7,036.36 km) |
| Helena to Cleckheaton | 4,394.20 mi (7,071.78 km) |
| Helena to Cleethorpes | 4,452.09 mi (7,164.94 km) |
| Helena to Clevedon | 4,469.82 mi (7,193.48 km) |
| Helena to Clifton | 4,449.82 mi (7,161.30 km) |
| Helena to Clifton | 4,400.48 mi (7,081.89 km) |
| Helena to Cliftonville | 4,601.22 mi (7,404.95 km) |
| Helena to Clitheroe | 4,367.39 mi (7,028.64 km) |
| Helena to Clydebank | 4,213.82 mi (6,781.49 km) |
| Helena to Coalville | 4,452.84 mi (7,166.15 km) |
| Helena to Coatbridge | 4,226.36 mi (6,801.68 km) |
| Helena to Cobham | 4,549.89 mi (7,322.34 km) |
