1. Algeria
2. Benin
3. Burkina Faso
4. Burundi
5. Cameroon
6. Central African Republic
7. Chad
8. Côte d'Ivoire
9. Democratic Republic of the Congo
10. Gabon
You could also include:
* Guinea
* Madagascar
* Mali
* Mauritania
* Niger
* Republic of the Congo
* Rwanda
* Senegal
* Togo
It's important to note that while French is the official language in all of these countries, the extent to which it is spoken varies greatly. In some countries, French is the dominant language, while in others, it is primarily used in government and education.