| Helena to Camarillo (California) | 930.17 mi (1,496.97 km) |
| Helena to Camas (Washington) | 503.11 mi (809.67 km) |
| Helena to Cambridge (Maryland) | 1,892.84 mi (3,046.23 km) |
| Helena to Cambridge (Massachusetts) | 2,014.08 mi (3,241.34 km) |
| Helena to Camden (Arkansas) | 1,349.06 mi (2,171.10 km) |
| Helena to Camden (New Jersey) | 1,894.66 mi (3,049.16 km) |
| Helena to Cameron Park (California) | 711.36 mi (1,144.83 km) |
| Helena to Camp Pendleton South (California) | 965.64 mi (1,554.04 km) |
| Helena to Camp Springs (Maryland) | 1,844.61 mi (2,968.62 km) |
| Helena to Camp Verde (Arizona) | 831.06 mi (1,337.47 km) |
| Helena to Campbell (California) | 820.21 mi (1,320.00 km) |
| Helena to Campbellsville (Kentucky) | 1,502.08 mi (2,417.37 km) |
| Helena to Campton Hills (Illinois) | 1,205.95 mi (1,940.79 km) |
| Helena to Canby (Oregon) | 520.35 mi (837.43 km) |
| Helena to Candelaria (Puerto Rico) | 3,237.08 mi (5,209.57 km) |
