| Diamond Bar to Carmignano | 6,170.71 mi (9,930.79 km) |
| Diamond Bar to Carovigno | 6,549.43 mi (10,540.30 km) |
| Diamond Bar to Carpenedolo | 6,070.62 mi (9,769.71 km) |
| Diamond Bar to Carpi | 6,115.49 mi (9,841.93 km) |
| Diamond Bar to Carrara | 6,127.28 mi (9,860.90 km) |
| Diamond Bar to Carugate | 6,026.02 mi (9,697.95 km) |
| Diamond Bar to Casal di Principe | 6,421.06 mi (10,333.70 km) |
| Diamond Bar to Casale Monferrato | 6,019.19 mi (9,686.96 km) |
| Diamond Bar to Casale sul Sile | 6,117.39 mi (9,844.99 km) |
| Diamond Bar to Casalecchio di Reno | 6,144.02 mi (9,887.84 km) |
| Diamond Bar to Casalgrande | 6,121.24 mi (9,851.19 km) |
| Diamond Bar to Casalmaggiore | 6,089.95 mi (9,800.83 km) |
| Diamond Bar to Casalnuovo di Napoli | 6,433.47 mi (10,353.67 km) |
| Diamond Bar to Casalpusterlengo | 6,055.49 mi (9,745.37 km) |
| Diamond Bar to Casaluce | 6,424.12 mi (10,338.61 km) |
