| Pays | Date d'adhésion |
| Angola** | 1975 |
| Bénin* | 1960 |
| Burundi | 1962 |
| Cameroun* | 1960 |
| Centrafrique/CAR* | 1960 |
| Congo (Brazzaville)* | 1960 |
| Côte d’Ivoire* | 1960 |
| Ethiopie | 1962 |
| Gabon* | 1960 |
| Ghana | 1978 |
| Guinea/Guinée | 1979 |
| Guinée Equatoriale/Equatorial Guinea | 1982 |
| Kenya*** | 1960 |
| Liberia | 1972 |
| Madagascar* | 1960 |
| Malawi | 1977 |
| Nigeria | 1962 |
| Rwanda | 1962 |
| Sierra Leone | 1962 |
| Tanzania* (1) | 1962 |
| Togo | 1961 |
| Uganda/Ouganda *(1) | 1960 |
| Zaïre (RD Congo/DR Congo) | 1962 |
| Zambia | 1985 |
| Zimbabwe | 1981 |