| Helena to Cognac | 4,834.29 mi (7,780.05 km) |
| Helena to Cogolin | 5,182.72 mi (8,340.78 km) |
| Helena to Colmar | 4,947.99 mi (7,963.03 km) |
| Helena to Colombes | 4,751.65 mi (7,647.04 km) |
| Helena to Colomiers | 4,995.89 mi (8,040.11 km) |
| Helena to Combs-la-Ville | 4,774.04 mi (7,683.08 km) |
| Helena to Comines | 4,680.31 mi (7,532.22 km) |
| Helena to Compiegne | 4,743.77 mi (7,634.36 km) |
| Helena to Concarneau | 4,608.02 mi (7,415.90 km) |
| Helena to Conde-sur-l'Escaut | 4,713.43 mi (7,585.53 km) |
| Helena to Conflans-Sainte-Honorine | 4,743.09 mi (7,633.26 km) |
| Helena to Corbas | 5,002.74 mi (8,051.13 km) |
| Helena to Corbeil-Essonnes | 4,774.54 mi (7,683.88 km) |
| Helena to Cormeilles-en-Parisis | 4,747.53 mi (7,640.40 km) |
| Helena to Cosne sur Loire | 4,850.23 mi (7,805.68 km) |
