| Hard to Corinth (Mississippi) | 4,831.49 mi (7,775.53 km) |
| Hard to Corinth (Texas) | 5,259.38 mi (8,464.15 km) |
| Hard to Cornelius (North Carolina) | 4,492.50 mi (7,229.99 km) |
| Hard to Cornelius (Oregon) | 5,402.65 mi (8,694.72 km) |
| Hard to Corning (New York) | 4,039.21 mi (6,500.48 km) |
| Hard to Corona (California) | 5,936.88 mi (9,554.48 km) |
| Hard to Coronado (California) | 5,993.82 mi (9,646.12 km) |
| Hard to Corpus Christi (Texas) | 5,552.56 mi (8,935.99 km) |
| Hard to Corsicana (Texas) | 5,290.65 mi (8,514.48 km) |
| Hard to Cortland (New York) | 3,984.59 mi (6,412.58 km) |
| Hard to Corvallis (Oregon) | 5,464.83 mi (8,794.79 km) |
| Hard to Coshocton (Ohio) | 4,314.68 mi (6,943.81 km) |
| Hard to Costa Mesa (California) | 5,959.00 mi (9,590.08 km) |
| Hard to Coto de Caza (California) | 5,952.99 mi (9,580.42 km) |
| Hard to Cottage Grove (Minnesota) | 4,524.88 mi (7,282.10 km) |
