| Keystone to Carrollwood (Florida) | 7.26 mi (11.68 km) |
| Keystone to Carson (California) | 2,137.61 mi (3,440.15 km) |
| Keystone to Carson City (Nevada) | 2,249.96 mi (3,620.96 km) |
| Keystone to Carteret (New Jersey) | 982.91 mi (1,581.84 km) |
| Keystone to Cartersville (Georgia) | 436.66 mi (702.74 km) |
| Keystone to Carthage (Missouri) | 922.43 mi (1,484.51 km) |
| Keystone to Cary (Illinois) | 1,023.30 mi (1,646.84 km) |
| Keystone to Cary (North Carolina) | 573.05 mi (922.23 km) |
| Keystone to Casa de Oro-Mount Helix (California) | 2,062.93 mi (3,319.96 km) |
| Keystone to Casa Grande (Arizona) | 1,761.02 mi (2,834.09 km) |
| Keystone to Casas Adobes (Arizona) | 1,715.56 mi (2,760.93 km) |
| Keystone to Cascades (Virginia) | 811.25 mi (1,305.58 km) |
| Keystone to Casper (Wyoming) | 1,667.50 mi (2,683.59 km) |
| Keystone to Casselberry (Florida) | 85.92 mi (138.28 km) |
| Keystone to Castaic (California) | 2,160.05 mi (3,476.27 km) |
