| Keystone to Cullman (Alabama) | 487.10 mi (783.92 km) |
| Keystone to Culpeper (Virginia) | 761.86 mi (1,226.10 km) |
| Keystone to Culver City (California) | 2,145.87 mi (3,453.45 km) |
| Keystone to Cumberland (Maryland) | 825.67 mi (1,328.79 km) |
| Keystone to Cupertino (California) | 2,360.59 mi (3,799.01 km) |
| Keystone to Cutler Bay (Florida) | 225.02 mi (362.13 km) |
| Keystone to Cutlerville (Michigan) | 1,030.70 mi (1,658.76 km) |
| Keystone to Cuyahoga Falls (Ohio) | 902.55 mi (1,452.52 km) |
| Keystone to Cypress (California) | 2,125.12 mi (3,420.05 km) |
| Keystone to Cypress Gardens (Florida) | 56.43 mi (90.81 km) |
| Keystone to Cypress Lake (Florida) | 118.09 mi (190.05 km) |
| Keystone to D'Iberville (Mississippi) | 412.56 mi (663.96 km) |
| Keystone to Dakota Ridge (Colorado) | 1,510.33 mi (2,430.65 km) |
| Keystone to Dale City (Virginia) | 786.89 mi (1,266.37 km) |
| Keystone to Dallas (Georgia) | 421.06 mi (677.64 km) |
