| Idaho Falls to Castelletto sopra Ticino | 5,282.24 mi (8,500.94 km) |
| Idaho Falls to Castelli Calepio | 5,325.63 mi (8,570.77 km) |
| Idaho Falls to Castelnovo ne' Monti | 5,405.46 mi (8,699.24 km) |
| Idaho Falls to Castelnuovo Berardenga | 5,498.41 mi (8,848.84 km) |
| Idaho Falls to Castelnuovo di Porto | 5,595.70 mi (9,005.41 km) |
| Idaho Falls to Castelnuovo di Verona | 5,362.72 mi (8,630.47 km) |
| Idaho Falls to Castelnuovo Rangone | 5,415.54 mi (8,715.47 km) |
| Idaho Falls to Castelvetrano | 5,850.68 mi (9,415.77 km) |
| Idaho Falls to Castelvetro di Modena | 5,418.76 mi (8,720.65 km) |
| Idaho Falls to Castenaso | 5,434.11 mi (8,745.36 km) |
| Idaho Falls to Castenedolo | 5,346.46 mi (8,604.29 km) |
| Idaho Falls to Castiglion Fiorentino | 5,511.38 mi (8,869.70 km) |
| Idaho Falls to Castiglione del Lago | 5,526.57 mi (8,894.16 km) |
| Idaho Falls to Castiglione delle Stiviere | 5,356.43 mi (8,620.34 km) |
| Idaho Falls to Castrolibero | 5,867.01 mi (9,442.04 km) |
