| Houghton Regis to Castelfidardo | 873.87 mi (1,406.36 km) |
| Houghton Regis to Castelfiorentino | 781.86 mi (1,258.29 km) |
| Houghton Regis to Castelfranco di Sopra | 799.41 mi (1,286.52 km) |
| Houghton Regis to Castelfranco di Sotto | 769.70 mi (1,238.71 km) |
| Houghton Regis to Castelfranco Emilia | 732.29 mi (1,178.51 km) |
| Houghton Regis to Castelfranco Veneto | 710.70 mi (1,143.76 km) |
| Houghton Regis to Castellabate | 1,088.77 mi (1,752.20 km) |
| Houghton Regis to Castellammare del Golfo | 1,157.34 mi (1,862.57 km) |
| Houghton Regis to Castellammare di Stabia | 1,050.86 mi (1,691.20 km) |
| Houghton Regis to Castellamonte | 586.16 mi (943.33 km) |
| Houghton Regis to Castellana Grotte | 1,130.55 mi (1,819.44 km) |
| Houghton Regis to Castellaneta | 1,135.46 mi (1,827.35 km) |
| Houghton Regis to Castellanza | 609.78 mi (981.35 km) |
| Houghton Regis to Castellarano | 724.96 mi (1,166.71 km) |
| Houghton Regis to Castelleone | 654.07 mi (1,052.63 km) |
