What 30 countries have French as their official language?

French is the sole official language of:

Bénin

Burkina Faso

Central African Republic

Congo (Democratic Republic of)

Congo (Republic of)

Côte d'Ivoire

France (and its overseas territories, such as French Guyana, Guadeloupe, Martinique, La Réunion)

Gabon

Guinea

Luxembourg

Mali

Monaco

Niger

Sénégal

Togo

French is one of the official languages of:

Belgium

Burundi

Cameroon

Canada

Chad

Channel Islands (Guernsey and Jersey)

Comoros

Djibouti

Equatorial Guinea

Haiti (the other official language is French Creole)

Madagascar

Rwanda

Seychelles

Switzerland

Vanuatu

Note, these are nations where French is one or the sole official language(s). It does not include nations or regions where French is spoken, but is not an official language.