| South San Francisco to Castelletto sopra Ticino | 5,924.03 mi (9,533.80 km) |
| South San Francisco to Castelli Calepio | 5,964.91 mi (9,599.60 km) |
| South San Francisco to Castelnovo ne' Monti | 6,046.48 mi (9,730.86 km) |
| South San Francisco to Castelnuovo Berardenga | 6,139.48 mi (9,880.54 km) |
| South San Francisco to Castelnuovo di Porto | 6,237.23 mi (10,037.86 km) |
| South San Francisco to Castelnuovo di Verona | 6,000.57 mi (9,656.99 km) |
| South San Francisco to Castelnuovo Rangone | 6,055.11 mi (9,744.76 km) |
| South San Francisco to Castelvetrano | 6,500.72 mi (10,461.90 km) |
| South San Francisco to Castelvetro di Modena | 6,058.41 mi (9,750.07 km) |
| South San Francisco to Castenaso | 6,072.57 mi (9,772.86 km) |
| South San Francisco to Castenedolo | 5,985.26 mi (9,632.35 km) |
| South San Francisco to Castiglion Fiorentino | 6,151.52 mi (9,899.91 km) |
| South San Francisco to Castiglione del Lago | 6,166.88 mi (9,924.64 km) |
| South San Francisco to Castiglione delle Stiviere | 5,994.95 mi (9,647.95 km) |
| South San Francisco to Castrolibero | 6,505.78 mi (10,470.04 km) |
