| Helena to Conyers (Georgia) | 1,715.34 mi (2,760.57 km) |
| Helena to Cookeville (Tennessee) | 1,542.11 mi (2,481.78 km) |
| Helena to Coolidge (Arizona) | 944.19 mi (1,519.52 km) |
| Helena to Coon Rapids (Minnesota) | 903.08 mi (1,453.37 km) |
| Helena to Cooper City (Florida) | 2,240.52 mi (3,605.77 km) |
| Helena to Coos Bay (Oregon) | 636.04 mi (1,023.61 km) |
| Helena to Copiague (New York) | 1,954.04 mi (3,144.72 km) |
| Helena to Coppell (Texas) | 1,230.18 mi (1,979.78 km) |
| Helena to Copperas Cove (Texas) | 1,306.93 mi (2,103.30 km) |
| Helena to Coral Gables (Florida) | 2,258.67 mi (3,634.98 km) |
| Helena to Coral Springs (Florida) | 2,230.25 mi (3,589.24 km) |
| Helena to Coral Terrace (Florida) | 2,255.09 mi (3,629.21 km) |
| Helena to Coralville (Iowa) | 1,063.99 mi (1,712.33 km) |
| Helena to Coram (New York) | 1,966.22 mi (3,164.33 km) |
| Helena to Corcoran (California) | 824.06 mi (1,326.20 km) |
