| Niagara Falls to Collegno | 4,079.32 mi (6,565.04 km) |
| Niagara Falls to Cologno al Serio | 4,148.19 mi (6,675.86 km) |
| Niagara Falls to Cologno Monzese | 4,133.01 mi (6,651.43 km) |
| Niagara Falls to Colorno | 4,200.48 mi (6,760.03 km) |
| Niagara Falls to Comacchio | 4,282.81 mi (6,892.52 km) |
| Niagara Falls to Comiso | 4,701.47 mi (7,566.29 km) |
| Niagara Falls to Como | 4,114.77 mi (6,622.08 km) |
| Niagara Falls to Concordia Sagittaria | 4,268.30 mi (6,869.17 km) |
| Niagara Falls to Concorezzo | 4,133.10 mi (6,651.58 km) |
| Niagara Falls to Conegliano | 4,241.59 mi (6,826.18 km) |
| Niagara Falls to Conselice | 4,275.68 mi (6,881.04 km) |
| Niagara Falls to Conselve | 4,249.37 mi (6,838.71 km) |
| Niagara Falls to Conversano | 4,636.66 mi (7,461.99 km) |
| Niagara Falls to Copertino | 4,705.06 mi (7,572.06 km) |
| Niagara Falls to Copparo | 4,260.86 mi (6,857.19 km) |
