Francophone is a term used to refer to French-speaking countries or regions.
French is the official language of France as well as 27 regions. 22 of these regions are situated in Europe and 5 are overseas territories. The 5 overseas territories are known as Département d’Outre Mer (or DOM):
Guadeloupe (North America)
Martinique (North America)
French Guyana (South America)
Reunion (Africa)
Mayotte (Africa)
France also has 6 overseas territories known as Territoires D’outre Mer (or TOM):
St. Pierre & Miquelon (North America)
St. Barthelemy (North America)
St. Martin (North America)
French Polynesia (Oceania)
New Caledonia (Oceania)
Wallis & Futuna (Oceania)
French is the official language of 28 countries as listed below:
Belgium
Benin
Burkina Faso
Burundi
Cameroon
Canada
Central African Republic
Chad
Comoros
Congo (Democratic Republic of the Congo)
Congo (Republic of the Congo)
Djibouti
Equatorial Guinea
Gabon
Guinea
Haiti
Ivory Coast
Luxembourg
Madagascar
Mali
Monaco
Niger
Rwanda
Senegal
Seychelles
Switzerland
Togo
Vanuatu
Many countries have French as a commonly spoken language but not as an official language. These include:
Algeria
Andorra
Cambodia
Dominica
Laos
Lebanon
Mauritania
Mauritius
Morocco
St. Lucia
Tunisia
Vietnam
Below is a map of Francophone countries:


(courtesy of worldinmaps.com)