| Keystone to Commerce (California) | 2,131.84 mi (3,430.86 km) |
| Keystone to Commerce City (Colorado) | 1,503.57 mi (2,419.76 km) |
| Keystone to Compton (California) | 2,136.03 mi (3,437.61 km) |
| Keystone to Comstock Park (Michigan) | 1,044.57 mi (1,681.07 km) |
| Keystone to Concord (California) | 2,361.58 mi (3,800.60 km) |
| Keystone to Concord (Missouri) | 844.78 mi (1,359.54 km) |
| Keystone to Concord (New Hampshire) | 1,210.88 mi (1,948.73 km) |
| Keystone to Concord (North Carolina) | 514.81 mi (828.50 km) |
| Keystone to Conneaut (Ohio) | 960.05 mi (1,545.06 km) |
| Keystone to Connersville (Indiana) | 809.56 mi (1,302.86 km) |
| Keystone to Conroe (Texas) | 790.93 mi (1,272.89 km) |
| Keystone to Converse (Texas) | 954.94 mi (1,536.82 km) |
| Keystone to Conway (Arkansas) | 752.59 mi (1,211.17 km) |
| Keystone to Conway (Florida) | 81.18 mi (130.64 km) |
| Keystone to Conway (South Carolina) | 447.10 mi (719.53 km) |
