| National City to Conyers (Georgia) | 1,907.58 mi (3,069.95 km) |
| National City to Cookeville (Tennessee) | 1,808.63 mi (2,910.71 km) |
| National City to Coolidge (Arizona) | 324.16 mi (521.68 km) |
| National City to Coon Rapids (Minnesota) | 1,534.22 mi (2,469.08 km) |
| National City to Cooper City (Florida) | 2,251.92 mi (3,624.11 km) |
| National City to Coos Bay (Oregon) | 835.12 mi (1,344.00 km) |
| National City to Copiague (New York) | 2,458.22 mi (3,956.13 km) |
| National City to Coppell (Texas) | 1,166.04 mi (1,876.55 km) |
| National City to Copperas Cove (Texas) | 1,128.93 mi (1,816.83 km) |
| National City to Coral Gables (Florida) | 2,261.17 mi (3,639.00 km) |
| National City to Coral Springs (Florida) | 2,248.11 mi (3,617.98 km) |
| National City to Coral Terrace (Florida) | 2,258.17 mi (3,634.18 km) |
| National City to Coralville (Iowa) | 1,528.75 mi (2,460.29 km) |
| National City to Coram (New York) | 2,478.12 mi (3,988.14 km) |
| National City to Corcoran (California) | 274.79 mi (442.23 km) |
