| Hard to Castle Rock (Colorado) | 5,215.29 mi (8,393.20 km) |
| Hard to Castro Valley (California) | 5,842.20 mi (9,402.12 km) |
| Hard to Catalina Foothills (Arizona) | 5,808.17 mi (9,347.35 km) |
| Hard to Cataño (Puerto Rico) | 4,632.30 mi (7,454.97 km) |
| Hard to Cathedral City (California) | 5,904.04 mi (9,501.63 km) |
| Hard to Catonsville (Maryland) | 4,149.72 mi (6,678.32 km) |
| Hard to Cave Spring (Virginia) | 4,375.98 mi (7,042.45 km) |
| Hard to Cayce (South Carolina) | 4,570.01 mi (7,354.72 km) |
| Hard to Cayey (Puerto Rico) | 4,648.86 mi (7,481.61 km) |
| Hard to Cedar City (Utah) | 5,578.09 mi (8,977.07 km) |
| Hard to Cedar Falls (Iowa) | 4,617.65 mi (7,431.39 km) |
| Hard to Cedar Hill (Texas) | 5,284.14 mi (8,504.00 km) |
| Hard to Cedar Lake (Indiana) | 4,483.89 mi (7,216.13 km) |
| Hard to Cedar Mill (Oregon) | 5,395.49 mi (8,683.21 km) |
| Hard to Cedar Park (Texas) | 5,424.93 mi (8,730.58 km) |
