| South San Francisco to Cortona | 6,157.38 mi (9,909.34 km) |
| South San Francisco to Cosenza | 6,508.16 mi (10,473.88 km) |
| South San Francisco to Cossato | 5,918.77 mi (9,525.34 km) |
| South San Francisco to Costa Volpino | 5,959.49 mi (9,590.87 km) |
| South San Francisco to Creazzo | 6,014.87 mi (9,680.00 km) |
| South San Francisco to Crema | 5,973.65 mi (9,613.66 km) |
| South San Francisco to Cremona | 5,996.70 mi (9,650.75 km) |
| South San Francisco to Crevalcore | 6,051.82 mi (9,739.46 km) |
| South San Francisco to Crispiano | 6,458.41 mi (10,393.80 km) |
| South San Francisco to Crosia | 6,506.82 mi (10,471.72 km) |
| South San Francisco to Crotone | 6,545.08 mi (10,533.29 km) |
| South San Francisco to Cuneo | 5,965.59 mi (9,600.69 km) |
| South San Francisco to Cuorgne | 5,913.35 mi (9,516.61 km) |
| South San Francisco to Cusano Milanino | 5,949.11 mi (9,574.17 km) |
| South San Francisco to Cutro | 6,544.35 mi (10,532.12 km) |
