| Mason City to Cosham | 4,085.23 mi (6,574.55 km) |
| Mason City to Costessey | 4,101.30 mi (6,600.40 km) |
| Mason City to Cottingham | 4,003.32 mi (6,442.71 km) |
| Mason City to Coulsdon | 4,101.85 mi (6,601.28 km) |
| Mason City to Coventry | 4,012.72 mi (6,457.84 km) |
| Mason City to Cowdenbeath | 3,823.29 mi (6,152.99 km) |
| Mason City to Cowes | 4,079.56 mi (6,565.42 km) |
| Mason City to Cowley | 4,081.76 mi (6,568.96 km) |
| Mason City to Cowley | 4,047.52 mi (6,513.86 km) |
| Mason City to Cramlington | 3,917.67 mi (6,304.88 km) |
| Mason City to Cranleigh | 4,096.17 mi (6,592.15 km) |
| Mason City to Crawley | 4,107.86 mi (6,610.97 km) |
| Mason City to Crayford | 4,108.80 mi (6,612.47 km) |
| Mason City to Crewe | 3,955.07 mi (6,365.08 km) |
| Mason City to Crigglestone | 3,969.03 mi (6,387.54 km) |
