The 2010 CIA World Factbook

by United States. Central Intelligence Agency

Costa Rica
18 years of age; universal and compulsory

Cote d'Ivoire
18 years of age; universal

Croatia
18 years of age, 16 if employed; universal

Cuba
16 years of age; universal

Curacao
18 years of age; universal

Cyprus
18 years of age; universal

Czech Republic
18 years of age; universal

Denmark
18 years of age; universal

Djibouti
18 years of age; universal

Dominica
18 years of age; universal