| Helena to Cullman (Alabama) | 1,567.94 mi (2,523.35 km) |
| Helena to Culpeper (Virginia) | 1,804.66 mi (2,904.32 km) |
| Helena to Culver City (California) | 931.77 mi (1,499.54 km) |
| Helena to Cumberland (Maryland) | 1,730.31 mi (2,784.66 km) |
| Helena to Cupertino (California) | 821.10 mi (1,321.43 km) |
| Helena to Cutler Bay (Florida) | 2,262.54 mi (3,641.20 km) |
| Helena to Cutlerville (Michigan) | 1,312.82 mi (2,112.77 km) |
| Helena to Cuyahoga Falls (Ohio) | 1,554.05 mi (2,501.00 km) |
| Helena to Cypress (California) | 937.62 mi (1,508.96 km) |
| Helena to Cypress Gardens (Florida) | 2,082.89 mi (3,352.09 km) |
| Helena to Cypress Lake (Florida) | 2,148.20 mi (3,457.19 km) |
| Helena to D'Iberville (Mississippi) | 1,662.63 mi (2,675.75 km) |
| Helena to Dakota Ridge (Colorado) | 593.67 mi (955.42 km) |
| Helena to Dale City (Virginia) | 1,829.67 mi (2,944.57 km) |
| Helena to Dallas (Georgia) | 1,666.97 mi (2,682.73 km) |
