| Helena to Commerce (California) | 927.88 mi (1,493.28 km) |
| Helena to Commerce City (Colorado) | 588.47 mi (947.05 km) |
| Helena to Compton (California) | 936.02 mi (1,506.38 km) |
| Helena to Comstock Park (Michigan) | 1,307.75 mi (2,104.61 km) |
| Helena to Concord (California) | 783.19 mi (1,260.41 km) |
| Helena to Concord (Missouri) | 1,230.41 mi (1,980.16 km) |
| Helena to Concord (New Hampshire) | 1,971.41 mi (3,172.68 km) |
| Helena to Concord (North Carolina) | 1,794.60 mi (2,888.13 km) |
| Helena to Conneaut (Ohio) | 1,578.29 mi (2,540.01 km) |
| Helena to Connersville (Indiana) | 1,429.33 mi (2,300.28 km) |
| Helena to Conroe (Texas) | 1,430.69 mi (2,302.48 km) |
| Helena to Converse (Texas) | 1,391.99 mi (2,240.19 km) |
| Helena to Conway (Arkansas) | 1,289.35 mi (2,075.01 km) |
| Helena to Conway (Florida) | 2,073.43 mi (3,336.86 km) |
| Helena to Conway (South Carolina) | 1,931.08 mi (3,107.77 km) |
