| Hard to Clermont (Florida) | 4,855.60 mi (7,814.34 km) |
| Hard to Cleveland (Mississippi) | 4,979.51 mi (8,013.75 km) |
| Hard to Cleveland (Ohio) | 4,253.94 mi (6,846.06 km) |
| Hard to Cleveland (Tennessee) | 4,671.83 mi (7,518.58 km) |
| Hard to Cleveland Heights (Ohio) | 4,247.75 mi (6,836.09 km) |
| Hard to Cliffside Park (New Jersey) | 3,968.66 mi (6,386.95 km) |
| Hard to Clifton (Colorado) | 5,351.73 mi (8,612.78 km) |
| Hard to Clifton (New Jersey) | 3,974.02 mi (6,395.57 km) |
| Hard to Clinton (Iowa) | 4,567.97 mi (7,351.44 km) |
| Hard to Clinton (Maryland) | 4,178.95 mi (6,725.37 km) |
| Hard to Clinton (Mississippi) | 5,032.66 mi (8,099.28 km) |
| Hard to Clinton (Utah) | 5,351.91 mi (8,613.07 km) |
| Hard to Clive (Iowa) | 4,710.65 mi (7,581.06 km) |
| Hard to Cloquet (Minnesota) | 4,419.56 mi (7,112.59 km) |
| Hard to Cloverleaf (Texas) | 5,357.36 mi (8,621.84 km) |
