| Key West to Cullman (Alabama) | 730.54 mi (1,175.69 km) |
| Key West to Culpeper (Virginia) | 985.98 mi (1,586.79 km) |
| Key West to Culver City (California) | 2,287.59 mi (3,681.53 km) |
| Key West to Cumberland (Maryland) | 1,057.11 mi (1,701.26 km) |
| Key West to Cupertino (California) | 2,521.50 mi (4,057.96 km) |
| Key West to Cutler Bay (Florida) | 114.17 mi (183.74 km) |
| Key West to Cutlerville (Michigan) | 1,282.07 mi (2,063.29 km) |
| Key West to Cuyahoga Falls (Ohio) | 1,147.04 mi (1,845.98 km) |
| Key West to Cypress (California) | 2,265.68 mi (3,646.26 km) |
| Key West to Cypress Gardens (Florida) | 237.71 mi (382.55 km) |
| Key West to Cypress Lake (Florida) | 136.67 mi (219.95 km) |
| Key West to D'Iberville (Mississippi) | 597.28 mi (961.22 km) |
| Key West to Dakota Ridge (Colorado) | 1,708.90 mi (2,750.20 km) |
| Key West to Dale City (Virginia) | 1,007.02 mi (1,620.64 km) |
| Key West to Dallas (Georgia) | 671.87 mi (1,081.27 km) |
