| Keystone to Carlsbad (California) | 2,081.14 mi (3,349.27 km) |
| Keystone to Carlsbad (New Mexico) | 1,322.07 mi (2,127.67 km) |
| Keystone to Carmel (Indiana) | 842.25 mi (1,355.47 km) |
| Keystone to Carmichael (California) | 2,329.58 mi (3,749.10 km) |
| Keystone to Carney (Maryland) | 853.00 mi (1,372.77 km) |
| Keystone to Carnot-Moon (Pennsylvania) | 866.52 mi (1,394.53 km) |
| Keystone to Carol Stream (Illinois) | 1,002.07 mi (1,612.68 km) |
| Keystone to Carolina (Puerto Rico) | 1,248.66 mi (2,009.52 km) |
| Keystone to Carolina Forest (South Carolina) | 446.29 mi (718.23 km) |
| Keystone to Carpentersville (Illinois) | 1,018.14 mi (1,638.54 km) |
| Keystone to Carpinteria (California) | 2,210.06 mi (3,556.74 km) |
| Keystone to Carrboro (North Carolina) | 576.39 mi (927.61 km) |
| Keystone to Carroll (Iowa) | 1,183.92 mi (1,905.33 km) |
| Keystone to Carrollton (Georgia) | 404.35 mi (650.74 km) |
| Keystone to Carrollton (Texas) | 913.59 mi (1,470.27 km) |
