| Keystone to Candler-McAfee (Georgia) | 399.10 mi (642.28 km) |
| Keystone to Caño Martin Peña (Puerto Rico) | 1,243.82 mi (2,001.74 km) |
| Keystone to Cañon City (Colorado) | 1,482.29 mi (2,385.52 km) |
| Keystone to Canóvanas (Puerto Rico) | 1,254.28 mi (2,018.58 km) |
| Keystone to Canton (Georgia) | 437.03 mi (703.33 km) |
| Keystone to Canton (Illinois) | 957.20 mi (1,540.46 km) |
| Keystone to Canton (Mississippi) | 539.68 mi (868.53 km) |
| Keystone to Canton (Ohio) | 878.65 mi (1,414.05 km) |
| Keystone to Canyon (Texas) | 1,229.47 mi (1,978.64 km) |
| Keystone to Canyon Lake (California) | 2,080.36 mi (3,348.01 km) |
| Keystone to Canyon Lake (Texas) | 953.27 mi (1,534.13 km) |
| Keystone to Cape Coral (Florida) | 109.22 mi (175.77 km) |
| Keystone to Cape Girardeau (Missouri) | 751.74 mi (1,209.81 km) |
| Keystone to Carbondale (Illinois) | 765.42 mi (1,231.82 km) |
| Keystone to Carlisle (Pennsylvania) | 888.63 mi (1,430.11 km) |
