| Helena to Coudekerque-Branche | 4,648.71 mi (7,481.37 km) |
| Helena to Coueron | 4,712.42 mi (7,583.90 km) |
| Helena to Coulommiers | 4,782.47 mi (7,696.63 km) |
| Helena to Courbevoic | 4,753.00 mi (7,649.21 km) |
| Helena to Courcouronnes | 4,772.42 mi (7,680.46 km) |
| Helena to Cournon-d'Auvergne | 4,945.46 mi (7,958.95 km) |
| Helena to Courrieres | 4,694.01 mi (7,554.29 km) |
| Helena to Coutras | 4,874.16 mi (7,844.20 km) |
| Helena to Couzeix | 4,876.05 mi (7,847.25 km) |
| Helena to Cran-Gevrier | 5,027.20 mi (8,090.50 km) |
| Helena to Craponne | 4,993.11 mi (8,035.63 km) |
| Helena to Creil | 4,741.54 mi (7,630.77 km) |
| Helena to Crepy-en-Valois | 4,754.98 mi (7,652.40 km) |
| Helena to Crest | 5,056.33 mi (8,137.38 km) |
| Helena to Creteil | 4,764.86 mi (7,668.30 km) |
