| Idaho Falls to Cortona | 5,517.24 mi (8,879.14 km) |
| Idaho Falls to Cosenza | 5,869.49 mi (9,446.03 km) |
| Idaho Falls to Cossato | 5,275.67 mi (8,490.36 km) |
| Idaho Falls to Costa Volpino | 5,321.11 mi (8,563.51 km) |
| Idaho Falls to Creazzo | 5,378.89 mi (8,656.48 km) |
| Idaho Falls to Crema | 5,333.26 mi (8,583.05 km) |
| Idaho Falls to Cremona | 5,356.51 mi (8,620.48 km) |
| Idaho Falls to Crevalcore | 5,413.12 mi (8,711.58 km) |
| Idaho Falls to Crispiano | 5,825.16 mi (9,374.68 km) |
| Idaho Falls to Crosia | 5,870.05 mi (9,446.93 km) |
| Idaho Falls to Crotone | 5,908.17 mi (9,508.29 km) |
| Idaho Falls to Cuneo | 5,318.57 mi (8,559.41 km) |
| Idaho Falls to Cuorgne | 5,268.79 mi (8,479.29 km) |
| Idaho Falls to Cusano Milanino | 5,308.09 mi (8,542.54 km) |
| Idaho Falls to Cutro | 5,906.98 mi (9,506.37 km) |
