| Keystone to Crawfordsville (Indiana) | 858.66 mi (1,381.88 km) |
| Keystone to Crest Hill (Illinois) | 979.30 mi (1,576.03 km) |
| Keystone to Crestview (Florida) | 299.95 mi (482.72 km) |
| Keystone to Crestwood (Illinois) | 977.62 mi (1,573.32 km) |
| Keystone to Crestwood (Missouri) | 847.99 mi (1,364.71 km) |
| Keystone to Creve Coeur (Missouri) | 855.96 mi (1,377.54 km) |
| Keystone to Crofton (Maryland) | 825.07 mi (1,327.82 km) |
| Keystone to Crossville (Tennessee) | 558.76 mi (899.24 km) |
| Keystone to Crowley (Louisiana) | 606.86 mi (976.65 km) |
| Keystone to Crowley (Texas) | 931.02 mi (1,498.33 km) |
| Keystone to Crown Point (Indiana) | 956.06 mi (1,538.62 km) |
| Keystone to Crystal (Minnesota) | 1,309.05 mi (2,106.72 km) |
| Keystone to Crystal Lake (Illinois) | 1,026.12 mi (1,651.38 km) |
| Keystone to Cudahy (California) | 2,133.57 mi (3,433.65 km) |
| Keystone to Cudahy (Wisconsin) | 1,064.99 mi (1,713.93 km) |
