| Harrow to Castelfidardo | 854.71 mi (1,375.52 km) |
| Harrow to Castelfiorentino | 761.32 mi (1,225.23 km) |
| Harrow to Castelfranco di Sopra | 779.22 mi (1,254.03 km) |
| Harrow to Castelfranco di Sotto | 749.10 mi (1,205.55 km) |
| Harrow to Castelfranco Emilia | 712.52 mi (1,146.70 km) |
| Harrow to Castelfranco Veneto | 692.53 mi (1,114.52 km) |
| Harrow to Castellabate | 1,068.45 mi (1,719.50 km) |
| Harrow to Castellammare del Golfo | 1,135.41 mi (1,827.26 km) |
| Harrow to Castellammare di Stabia | 1,030.52 mi (1,658.47 km) |
| Harrow to Castellamonte | 564.84 mi (909.02 km) |
| Harrow to Castellana Grotte | 1,111.58 mi (1,788.92 km) |
| Harrow to Castellaneta | 1,116.25 mi (1,796.43 km) |
| Harrow to Castellanza | 589.46 mi (948.64 km) |
| Harrow to Castellarano | 705.00 mi (1,134.59 km) |
| Harrow to Castelleone | 634.06 mi (1,020.42 km) |
