| Helena to Candler-McAfee (Georgia) | 1,700.41 mi (2,736.55 km) |
| Helena to Caño Martin Peña (Puerto Rico) | 3,243.11 mi (5,219.27 km) |
| Helena to Cañon City (Colorado) | 660.68 mi (1,063.26 km) |
| Helena to Canóvanas (Puerto Rico) | 3,252.88 mi (5,235.01 km) |
| Helena to Canton (Georgia) | 1,667.97 mi (2,684.34 km) |
| Helena to Canton (Illinois) | 1,171.65 mi (1,885.59 km) |
| Helena to Canton (Mississippi) | 1,509.38 mi (2,429.11 km) |
| Helena to Canton (Ohio) | 1,571.57 mi (2,529.20 km) |
| Helena to Canyon (Texas) | 958.51 mi (1,542.58 km) |
| Helena to Canyon Lake (California) | 933.29 mi (1,501.98 km) |
| Helena to Canyon Lake (Texas) | 1,371.06 mi (2,206.51 km) |
| Helena to Cape Coral (Florida) | 2,138.84 mi (3,442.13 km) |
| Helena to Cape Girardeau (Missouri) | 1,313.74 mi (2,114.25 km) |
| Helena to Carbondale (Illinois) | 1,312.11 mi (2,111.63 km) |
| Helena to Carlisle (Pennsylvania) | 1,787.13 mi (2,876.11 km) |
