| Helena to Clemson (South Carolina) | 1,724.39 mi (2,775.13 km) |
| Helena to Clermont (Florida) | 2,055.13 mi (3,307.41 km) |
| Helena to Cleveland (Mississippi) | 1,424.59 mi (2,292.66 km) |
| Helena to Cleveland (Ohio) | 1,537.72 mi (2,474.71 km) |
| Helena to Cleveland (Tennessee) | 1,610.93 mi (2,592.54 km) |
| Helena to Cleveland Heights (Ohio) | 1,542.30 mi (2,482.09 km) |
| Helena to Cliffside Park (New Jersey) | 1,921.35 mi (3,092.12 km) |
| Helena to Clifton (Colorado) | 549.84 mi (884.89 km) |
| Helena to Clifton (New Jersey) | 1,912.12 mi (3,077.27 km) |
| Helena to Clinton (Iowa) | 1,123.14 mi (1,807.52 km) |
| Helena to Clinton (Maryland) | 1,847.08 mi (2,972.59 km) |
| Helena to Clinton (Mississippi) | 1,509.25 mi (2,428.90 km) |
| Helena to Clinton (Utah) | 377.05 mi (606.80 km) |
| Helena to Clive (Iowa) | 964.62 mi (1,552.40 km) |
| Helena to Cloquet (Minnesota) | 923.69 mi (1,486.54 km) |
