| Idaho Falls to Castelfidardo | 5,554.18 mi (8,938.59 km) |
| Idaho Falls to Castelfiorentino | 5,468.04 mi (8,799.96 km) |
| Idaho Falls to Castelfranco di Sopra | 5,485.03 mi (8,827.30 km) |
| Idaho Falls to Castelfranco di Sotto | 5,455.90 mi (8,780.43 km) |
| Idaho Falls to Castelfranco Emilia | 5,416.66 mi (8,717.28 km) |
| Idaho Falls to Castelfranco Veneto | 5,385.06 mi (8,666.41 km) |
| Idaho Falls to Castellabate | 5,774.50 mi (9,293.16 km) |
| Idaho Falls to Castellammare del Golfo | 5,834.54 mi (9,389.78 km) |
| Idaho Falls to Castellammare di Stabia | 5,736.67 mi (9,232.29 km) |
| Idaho Falls to Castellamonte | 5,271.15 mi (8,483.10 km) |
| Idaho Falls to Castellana Grotte | 5,807.03 mi (9,345.52 km) |
| Idaho Falls to Castellaneta | 5,814.36 mi (9,357.30 km) |
| Idaho Falls to Castellanza | 5,295.80 mi (8,522.76 km) |
| Idaho Falls to Castellarano | 5,410.04 mi (8,706.62 km) |
| Idaho Falls to Castelleone | 5,339.44 mi (8,593.00 km) |
