| NATION | PARTY | BEGAN | ENDED | DURATION |
|---|---|---|---|---|
| Mexico | National Revolutionary Party | 1920 | (not yet) | 50 |
| North Korea | Communist Party | 1946 | (not yet) | 49 |
| Mongolia | Communist Party | 1924 | 1992 | 47 |
| China | Kungchantang (Communist Party) | 1949 | (not yet) | 46 |
| Russia | Communist Party | 1917 | 1991 | 46 |
| Yugoslavia | Communist Party | 1945 | 1990 | 45 |
| Taiwan | Kuomintang (Nationalists) | 1945 | 1989 | 44 |
| Albania | Communist Party | 1947 | 1989 | 42 |
| Bulgaria | Communist Party | 1947 | 1989 | 42 |
| Hungary | Communist Party | 1947 | 1989 | 42 |
| Poland | Communist Party | 1947 | 1989 | 42 |
| Romania | Communist Party | 1947 | 1989 | 42 |
| Czechoslovakia | Communist Party | 1948 | 1989 | 41 |
| Vietnam | Communist Party | 1954 | (not yet) | 41 |
| East Germany | Communist Party | 1948 | 1989 | 40 |
| Cote D'Ivoire | Parti Democratique | 1958 | 1993 | 35 |
| Cuba | Partido Communist | 1960 | (not yet) | 35 |
| Liberia | True Whig | 1878 | 1980 | 35 |
| Spain | National Movement | 1939 | 1976 | 31 |
| Tanzania | Tanganyika African Nat'l Union / Chama Cha Mapinduzi | 1961 | 1992 | 31 |
| Tunisia | Parti Socialisti Destourien | 1956 | 1987 | 31 |
| Gabon | Parti Democratique Gabonais | 1960 | 1990 | 30 |
| Malawi | Malawi Congress Party | 1964 | 1994 | 30 |
| Portugal | União Nacional | 1930 | 1974 | 29 |
| Cameroon | National Cameroonian Union | 1966 | 1992 | 26 |
| Guinea | Democratic Party of Guinea | 1958 | 1984 | 26 |
| Zambia | United National Independence Party | 1964 | 1990 | 26 |
| Kenya | Kenya African National Union | 1965 | 1991 | 26 |
| Syria | Baath Arab Socialist Party | 1970 | (not yet) | 25 |
| Congo | Congolese Labor Party | 1968 | 1991 | 23 |
| Sierra Leone | All-People's Congress | 1973 | 1994 | 21 |
| Laos | Lao People's Revolutionary Party | 1975 | (not yet) | 20 |
(Where power was kept for more than 30 years)
["Duration"]
Only the years 1945-95 are counted.
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Last updated November 1999
Copyright © 1999Matthew White