| Mason City to Cromer | 4,094.35 mi (6,589.22 km) |
| Mason City to Crosby | 3,920.50 mi (6,309.43 km) |
| Mason City to Crowborough | 4,122.41 mi (6,634.38 km) |
| Mason City to Croxley Green | 4,078.74 mi (6,564.09 km) |
| Mason City to Croydon | 4,101.00 mi (6,599.92 km) |
| Mason City to Cudworth | 3,975.13 mi (6,397.35 km) |
| Mason City to Culcheth | 3,940.06 mi (6,340.92 km) |
| Mason City to Cullercoats | 3,924.57 mi (6,315.99 km) |
| Mason City to Cumbernauld | 3,806.44 mi (6,125.87 km) |
| Mason City to Cumnock | 3,812.67 mi (6,135.89 km) |
| Mason City to Cupar | 3,828.16 mi (6,160.84 km) |
| Mason City to Cwmbran | 3,983.91 mi (6,411.48 km) |
| Mason City to Dagenham | 4,104.04 mi (6,604.82 km) |
| Mason City to Dalkeith | 3,840.14 mi (6,180.11 km) |
| Mason City to Darfield | 3,977.73 mi (6,401.53 km) |
