| Helena to Cordele (Georgia) | 1,802.79 mi (2,901.32 km) |
| Helena to Corinth (Mississippi) | 1,461.03 mi (2,351.31 km) |
| Helena to Corinth (Texas) | 1,217.48 mi (1,959.34 km) |
| Helena to Cornelius (North Carolina) | 1,780.20 mi (2,864.96 km) |
| Helena to Cornelius (Oregon) | 533.65 mi (858.82 km) |
| Helena to Corning (New York) | 1,739.22 mi (2,799.00 km) |
| Helena to Corona (California) | 926.62 mi (1,491.25 km) |
| Helena to Coronado (California) | 1,000.11 mi (1,609.53 km) |
| Helena to Corpus Christi (Texas) | 1,527.35 mi (2,458.04 km) |
| Helena to Corsicana (Texas) | 1,297.52 mi (2,088.16 km) |
| Helena to Cortland (New York) | 1,769.18 mi (2,847.21 km) |
| Helena to Corvallis (Oregon) | 561.56 mi (903.74 km) |
| Helena to Coshocton (Ohio) | 1,565.17 mi (2,518.89 km) |
| Helena to Costa Mesa (California) | 945.35 mi (1,521.40 km) |
| Helena to Coto de Caza (California) | 944.57 mi (1,520.13 km) |
