| Houghton Regis to Castelletto sopra Ticino | 596.12 mi (959.36 km) |
| Houghton Regis to Castelli Calepio | 641.58 mi (1,032.53 km) |
| Houghton Regis to Castelnovo ne' Monti | 719.54 mi (1,157.98 km) |
| Houghton Regis to Castelnuovo Berardenga | 812.39 mi (1,307.41 km) |
| Houghton Regis to Castelnuovo di Porto | 909.52 mi (1,463.72 km) |
| Houghton Regis to Castelnuovo di Verona | 680.79 mi (1,095.63 km) |
| Houghton Regis to Castelnuovo Rangone | 730.74 mi (1,176.02 km) |
| Houghton Regis to Castelvetrano | 1,175.65 mi (1,892.03 km) |
| Houghton Regis to Castelvetro di Modena | 733.86 mi (1,181.04 km) |
| Houghton Regis to Castenaso | 750.64 mi (1,208.04 km) |
| Houghton Regis to Castenedolo | 663.00 mi (1,067.00 km) |
| Houghton Regis to Castiglion Fiorentino | 825.83 mi (1,329.05 km) |
| Houghton Regis to Castiglione del Lago | 840.89 mi (1,353.27 km) |
| Houghton Regis to Castiglione delle Stiviere | 673.36 mi (1,083.66 km) |
| Houghton Regis to Castrolibero | 1,181.76 mi (1,901.85 km) |
