| Seia to Clay Cross | 928.39 mi (1,494.10 km) |
| Seia to Clayton | 962.91 mi (1,549.66 km) |
| Seia to Clayton le Moors | 955.24 mi (1,537.30 km) |
| Seia to Cleckheaton | 960.45 mi (1,545.70 km) |
| Seia to Cleethorpes | 975.48 mi (1,569.88 km) |
| Seia to Clevedon | 795.54 mi (1,280.30 km) |
| Seia to Clifton | 915.31 mi (1,473.06 km) |
| Seia to Clifton | 985.18 mi (1,585.49 km) |
| Seia to Cliftonville | 873.57 mi (1,405.88 km) |
| Seia to Clitheroe | 961.49 mi (1,547.37 km) |
| Seia to Clydebank | 1,079.87 mi (1,737.88 km) |
| Seia to Coalville | 900.78 mi (1,449.66 km) |
| Seia to Coatbridge | 1,079.83 mi (1,737.81 km) |
| Seia to Cobham | 830.28 mi (1,336.20 km) |
| Seia to Cockermouth | 1,003.96 mi (1,615.72 km) |
