| Diamond Bar to Cassina de' Pecchi | 6,028.82 mi (9,702.45 km) |
| Diamond Bar to Cassino | 6,385.19 mi (10,275.97 km) |
| Diamond Bar to Castagneto Carducci | 6,191.39 mi (9,964.08 km) |
| Diamond Bar to Castano Primo | 6,007.82 mi (9,668.65 km) |
| Diamond Bar to Castel Bolognese | 6,169.20 mi (9,928.37 km) |
| Diamond Bar to Castel Gandolfo | 6,333.71 mi (10,193.12 km) |
| Diamond Bar to Castel Goffredo | 6,075.49 mi (9,777.56 km) |
| Diamond Bar to Castel Maggiore | 6,142.25 mi (9,884.99 km) |
| Diamond Bar to Castel Mella | 6,054.64 mi (9,743.99 km) |
| Diamond Bar to Castel San Giorgio | 6,451.97 mi (10,383.45 km) |
| Diamond Bar to Castel San Giovanni | 6,055.16 mi (9,744.84 km) |
| Diamond Bar to Castel San Pietro Terme | 6,157.93 mi (9,910.23 km) |
| Diamond Bar to Castel Volturno | 6,412.27 mi (10,319.55 km) |
| Diamond Bar to Castelbuono | 6,587.38 mi (10,601.37 km) |
| Diamond Bar to Casteldaccia | 6,561.87 mi (10,560.31 km) |
