| Mason City to Clacton-on-Sea | 4,131.00 mi (6,648.20 km) |
| Mason City to Clay Cross | 3,989.66 mi (6,420.74 km) |
| Mason City to Clayton | 3,953.96 mi (6,363.29 km) |
| Mason City to Clayton le Moors | 3,933.96 mi (6,331.10 km) |
| Mason City to Cleckheaton | 3,959.27 mi (6,371.84 km) |
| Mason City to Cleethorpes | 4,025.21 mi (6,477.95 km) |
| Mason City to Clevedon | 3,997.62 mi (6,433.54 km) |
| Mason City to Clifton | 4,007.22 mi (6,449.00 km) |
| Mason City to Clifton | 3,972.64 mi (6,393.34 km) |
| Mason City to Cliftonville | 4,155.46 mi (6,687.57 km) |
| Mason City to Clitheroe | 3,930.43 mi (6,325.41 km) |
| Mason City to Clydebank | 3,793.85 mi (6,105.61 km) |
| Mason City to Coalville | 4,006.68 mi (6,448.12 km) |
| Mason City to Coatbridge | 3,807.92 mi (6,128.26 km) |
| Mason City to Cobham | 4,091.66 mi (6,584.89 km) |
