| Hard to Caguas (Puerto Rico) | 4,637.38 mi (7,463.14 km) |
| Hard to Cahokia (Illinois) | 4,722.34 mi (7,599.87 km) |
| Hard to Calabasas (California) | 5,954.62 mi (9,583.03 km) |
| Hard to Caldwell (Idaho) | 5,344.53 mi (8,601.19 km) |
| Hard to Caledonia (Wisconsin) | 4,434.38 mi (7,136.44 km) |
| Hard to Calera (Alabama) | 4,847.53 mi (7,801.34 km) |
| Hard to Calexico (California) | 5,939.60 mi (9,558.86 km) |
| Hard to Calhoun (Georgia) | 4,707.39 mi (7,575.81 km) |
| Hard to California (Maryland) | 4,181.50 mi (6,729.48 km) |
| Hard to California City (California) | 5,870.83 mi (9,448.18 km) |
| Hard to Callaway (Florida) | 4,942.96 mi (7,954.93 km) |
| Hard to Calumet City (Illinois) | 4,476.85 mi (7,204.80 km) |
| Hard to Calverton (Maryland) | 4,167.30 mi (6,706.62 km) |
| Hard to Camano (Washington) | 5,230.27 mi (8,417.31 km) |
| Hard to Camarillo (California) | 5,960.60 mi (9,592.66 km) |
