| Helena to Central Point (Oregon) | 610.15 mi (981.94 km) |
| Helena to Centralia (Illinois) | 1,285.63 mi (2,069.02 km) |
| Helena to Centralia (Washington) | 518.89 mi (835.07 km) |
| Helena to Centreville (Virginia) | 1,818.93 mi (2,927.29 km) |
| Helena to Ceres (California) | 771.54 mi (1,241.68 km) |
| Helena to Cerritos (California) | 934.82 mi (1,504.45 km) |
| Helena to Chalco (Nebraska) | 872.88 mi (1,404.77 km) |
| Helena to Chalmette (Louisiana) | 1,649.00 mi (2,653.80 km) |
| Helena to Chambersburg (Pennsylvania) | 1,773.87 mi (2,854.76 km) |
| Helena to Chamblee (Georgia) | 1,692.21 mi (2,723.35 km) |
| Helena to Champaign (Illinois) | 1,268.30 mi (2,041.13 km) |
| Helena to Champlin (Minnesota) | 899.32 mi (1,447.32 km) |
| Helena to Chandler (Arizona) | 919.95 mi (1,480.52 km) |
| Helena to Chanhassen (Minnesota) | 896.30 mi (1,442.45 km) |
| Helena to Channahon (Illinois) | 1,228.31 mi (1,976.77 km) |
