| Helena to Cibolo (Texas) | 1,391.45 mi (2,239.32 km) |
| Helena to Cicero (Illinois) | 1,239.85 mi (1,995.35 km) |
| Helena to Cimarron Hills (Colorado) | 650.37 mi (1,046.67 km) |
| Helena to Cincinnati (Ohio) | 1,476.27 mi (2,375.83 km) |
| Helena to Cinco Ranch (Texas) | 1,455.50 mi (2,342.41 km) |
| Helena to Circleville (Ohio) | 1,534.59 mi (2,469.69 km) |
| Helena to Citrus (California) | 915.34 mi (1,473.09 km) |
| Helena to Citrus Heights (California) | 720.03 mi (1,158.78 km) |
| Helena to Citrus Park (Florida) | 2,042.61 mi (3,287.26 km) |
| Helena to Claiborne (Louisiana) | 1,427.07 mi (2,296.65 km) |
| Helena to Claremont (California) | 911.68 mi (1,467.20 km) |
| Helena to Claremont (New Hampshire) | 1,931.23 mi (3,108.02 km) |
| Helena to Claremore (Oklahoma) | 1,103.71 mi (1,776.26 km) |
| Helena to Clarksburg (Maryland) | 1,814.59 mi (2,920.29 km) |
| Helena to Clarksburg (West Virginia) | 1,667.98 mi (2,684.35 km) |
