Compare data on Parliaments
Structure of parliament
Structure of parliament: Unicameral, bicameral
View field in the data dictionaryThe designations employed and the presentation of material on this map do not imply the expression of any opinion whatsoever on the part of the IPU concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitations of its frontiers or boundaries.
- 1961
- 1962
- 1963
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- 1968
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- 2014
- 2015
- 2016
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- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
Historical data available from 1961
- 1961
- 1962
- 1963
- 1964
- 1965
- 1966
- 1967
- 1968
- 1969
- 1970
- 1971
- 1972
- 1973
- 1974
- 1975
- 1976
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- 1980
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- 1990
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- 1992
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- 2010
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- 2018
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- 2020
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- 2022
- 2023
- 2024
- 2025
- 2026
Historical data available from 1961
Structure of parliament: Unicameral, bicameral
Aggregated data as of today
| Structure of parliament | Number of countries |
|---|---|
| Unicameral | 108 |
| Bicameral | 81 |
Excluding 4 parliaments where all chambers are suspended
| Country | Chamber | Structure of parliament |
|---|---|---|
|
Afghanistan
|
House of the People (Suspended), House of Elders (Suspended) | Bicameral |
| Albania | Parliament | Unicameral |
| Algeria | National People's Assembly, Council of the Nation | Bicameral |
| Andorra | General Council | Unicameral |
| Angola | National Assembly | Unicameral |
| Antigua and Barbuda | House of Representatives, Senate | Bicameral |
| Argentina | Chamber of Deputies, Senate | Bicameral |
| Armenia | National Assembly | Unicameral |
| Australia | House of Representatives, Senate | Bicameral |
| Austria | National Council, Federal Council | Bicameral |
| Azerbaijan | National Assembly | Unicameral |
| Bahamas | House of Assembly, Senate | Bicameral |
| Bahrain | Council of Representatives, Shura Council | Bicameral |
| Bangladesh | Parliament | Unicameral |
| Barbados | House of Assembly, Senate | Bicameral |
| Belarus | House of Representatives, Council of the Republic | Bicameral |
| Belgium | House of Representatives, Senate | Bicameral |
| Belize | House of Representatives, Senate | Bicameral |
| Benin | National Assembly | Unicameral |
| Bhutan | National Assembly, National Council | Bicameral |
| Bolivia (Plurinational State of) | Chamber of Deputies, Chamber of Senators | Bicameral |
| Bosnia and Herzegovina | House of Representatives, House of Peoples | Bicameral |
| Botswana | National Assembly | Unicameral |
| Brazil | Chamber of Deputies, Federal Senate | Bicameral |
| Brunei Darussalam | Legislative Council | Unicameral |
| Bulgaria | National Assembly | Unicameral |
| Burkina Faso | Transitional Legislative Assembly | Unicameral |
| Burundi | National Assembly, Senate | Bicameral |
| Cabo Verde | National Assembly | Unicameral |
| Cambodia | National Assembly, Senate | Bicameral |
| Cameroon | National Assembly, Senate | Bicameral |
| Canada | House of Commons, Senate | Bicameral |
| Central African Republic | National Assembly | Unicameral |
| Chad | National Assembly, Senate | Bicameral |
| Chile | Chamber of Deputies, Senate | Bicameral |
| China | National People's Congress | Unicameral |
| Colombia | House of Representatives, Senate | Bicameral |
| Comoros | Assembly of the Union | Unicameral |
| Congo | National Assembly, Senate | Bicameral |
| Costa Rica | Legislative Assembly | Unicameral |
| Côte d'Ivoire | National Assembly, Senate | Bicameral |
| Croatia | Croatian Parliament | Unicameral |
| Cuba | National Assembly of the People's Power | Unicameral |
| Cyprus | House of Representatives | Unicameral |
| Czechia | Chamber of Deputies, Senate | Bicameral |
| Democratic People's Republic of Korea | Supreme People's Assembly | Unicameral |
| Democratic Republic of the Congo | National Assembly, Senate | Bicameral |
| Denmark | The Danish Parliament | Unicameral |
| Djibouti | National Assembly | Unicameral |
| Dominica | House of Assembly | Unicameral |
| Dominican Republic | Chamber of Deputies, Senate | Bicameral |
| Ecuador | National Assembly | Unicameral |
| Egypt | House of Representatives, Senate | Bicameral |
| El Salvador | Legislative Assembly | Unicameral |
| Equatorial Guinea | Chamber of Deputies, Senate | Bicameral |
| Eritrea | National Assembly | Unicameral |
| Estonia | The Estonian Parliament | Unicameral |
| Eswatini | House of Assembly, Senate | Bicameral |
| Ethiopia | House of Peoples' Representatives, House of the Federation | Bicameral |
| Fiji | Parliament | Unicameral |
| Finland | Parliament | Unicameral |
| France | National Assembly, Senate | Bicameral |
| Gabon | National Assembly, Senate | Bicameral |
| Gambia (The) | National Assembly | Unicameral |
| Georgia | Parliament | Unicameral |
| Germany | German Bundestag, Federal Council | Bicameral |
| Ghana | Parliament | Unicameral |
| Greece | Hellenic Parliament | Unicameral |
| Grenada | House of Representatives, Senate | Bicameral |
| Guatemala | Congress of the Republic | Unicameral |
| Guinea | Transitional National Council | Unicameral |
| Guinea-Bissau | Transitional National Council | Unicameral |
| Guyana | National Assembly | Unicameral |
| Haiti | Chamber of Deputies, Senate | Bicameral |
| Honduras | National Congress | Unicameral |
| Hungary | National Assembly | Unicameral |
| Iceland | Parliament | Unicameral |
| India | House of the People, Council of States | Bicameral |
| Indonesia | House of Representatives | Unicameral |
| Iran (Islamic Republic of) | Islamic Parliament of Iran | Unicameral |
| Iraq | Council of Representatives of Iraq | Unicameral |
| Ireland | House of Representatives, Senate | Bicameral |
| Israel | Parliament | Unicameral |
| Italy | Chamber of Deputies, Senate | Bicameral |
| Jamaica | House of Representatives, Senate | Bicameral |
| Japan | House of Representatives, House of Councillors | Bicameral |
| Jordan | House of Representatives, Senate | Bicameral |
| Kazakhstan | House of Representatives, Senate | Bicameral |
| Kenya | National Assembly, Senate | Bicameral |
| Kiribati | House of Assembly | Unicameral |
|
Kuwait
|
National Assembly (Suspended) | Unicameral |
| Kyrgyzstan | Supreme Council | Unicameral |
| Lao People's Democratic Republic | National Assembly | Unicameral |
| Latvia | Parliament | Unicameral |
| Lebanon | National Assembly | Unicameral |
| Lesotho | National Assembly, Senate | Bicameral |
| Liberia | House of Representatives, The Liberian Senate | Bicameral |
| Libya | House of Representatives | Unicameral |
| Liechtenstein | Diet | Unicameral |
| Lithuania | Parliament | Unicameral |
| Luxembourg | Chamber of Deputies | Unicameral |
| Madagascar | National Assembly, Senate | Bicameral |
| Malawi | National Assembly | Unicameral |
| Malaysia | House of Representatives, Senate | Bicameral |
| Maldives | People's Majlis | Unicameral |
| Mali | Transitional National Council | Unicameral |
| Malta | House of Representatives | Unicameral |
| Marshall Islands | Parliament | Unicameral |
| Mauritania | National Assembly, Senate (Suspended) | Unicameral |
| Mauritius | National Assembly | Unicameral |
| Mexico | Chamber of Deputies, Senate | Bicameral |
| Micronesia (Federated States of) | Congress | Unicameral |
| Monaco | National Council | Unicameral |
| Mongolia | State Great Hural | Unicameral |
| Montenegro | Parliament | Unicameral |
| Morocco | House of Representatives, House of Councillors | Bicameral |
| Mozambique | Assembly of the Republic | Unicameral |
|
Myanmar
|
House of Representatives (Suspended), House of Nationalities (Suspended) | Bicameral |
| Namibia | National Assembly, National Council | Bicameral |
| Nauru | Parliament | Unicameral |
| Nepal | House of Representatives, National Assembly | Bicameral |
| Netherlands | House of Representatives, Senate | Bicameral |
| New Zealand | House of Representatives | Unicameral |
| Nicaragua | National Assembly | Unicameral |
| Niger | Advisory Council for the Refoundation | Unicameral |
| Nigeria | House of Representatives, Senate | Bicameral |
| North Macedonia | Assembly of the Republic | Unicameral |
| Norway | Parliament | Unicameral |
| Oman | Shura Council, State Council | Bicameral |
| Pakistan | National Assembly, Senate | Bicameral |
| Palau | House of Delegates, Senate | Bicameral |
| Panama | National Assembly | Unicameral |
| Papua New Guinea | National Parliament | Unicameral |
| Paraguay | Chamber of Deputies, Senate | Bicameral |
| Peru | Congress of the Republic | Unicameral |
| Philippines | House of Representatives, Senate | Bicameral |
| Poland | Sejm, Senate | Bicameral |
| Portugal | Assembly of the Republic | Unicameral |
| Qatar | Shura Council | Unicameral |
| Republic of Korea | National Assembly | Unicameral |
| Republic of Moldova | Parliament | Unicameral |
| Romania | Chamber of Deputies, Senate | Bicameral |
| Russian Federation | State Duma, Council of the Federation | Bicameral |
| Rwanda | Chamber of Deputies, Senate | Bicameral |
| Saint Kitts and Nevis | National Assembly | Unicameral |
| Saint Lucia | House of Assembly, Senate | Bicameral |
| Saint Vincent and the Grenadines | House of Assembly | Unicameral |
| Samoa | Legislative Assembly | Unicameral |
| San Marino | Great and General Council | Unicameral |
| Sao Tome and Principe | National Assembly | Unicameral |
| Saudi Arabia | Shura Council | Unicameral |
| Senegal | National Assembly | Unicameral |
| Serbia | National Assembly | Unicameral |
| Seychelles | National Assembly | Unicameral |
| Sierra Leone | Parliament | Unicameral |
| Singapore | Parliament | Unicameral |
| Slovakia | National Council | Unicameral |
| Slovenia | National Assembly, National Council | Bicameral |
| Solomon Islands | National Parliament | Unicameral |
| Somalia | House of the People, Upper House | Bicameral |
| South Africa | National Assembly, National Council of Provinces | Bicameral |
| South Sudan | Transitional National Legislative Assembly, Council of States | Bicameral |
| Spain | Congress of Deputies, Senate | Bicameral |
| Sri Lanka | Parliament | Unicameral |
|
Sudan
|
National Assembly (Suspended), Council of States (Suspended) | Bicameral |
| Suriname | National Assembly | Unicameral |
| Sweden | Parliament | Unicameral |
| Switzerland | National Council, Council of States | Bicameral |
| Syrian Arab Republic | People's Assembly | Unicameral |
| Tajikistan | House of Representatives, National Assembly | Bicameral |
| Thailand | House of Representatives, Senate | Bicameral |
| Timor-Leste | National Parliament | Unicameral |
| Togo | National Assembly, Senate | Bicameral |
| Tonga | Legislative Assembly | Unicameral |
| Trinidad and Tobago | House of Representatives, Senate | Bicameral |
| Tunisia | Assembly of People's Representatives, National Council of Regions and Districts | Bicameral |
| Türkiye | Grand National Assembly of Türkiye | Unicameral |
| Turkmenistan | Assembly, People’s Council (Suspended) | Unicameral |
| Tuvalu | Parliament of Tuvalu | Unicameral |
| Uganda | Parliament | Unicameral |
| Ukraine | Parliament | Unicameral |
| United Arab Emirates | Federal National Council | Unicameral |
| United Kingdom | House of Commons, House of Lords | Bicameral |
| United Republic of Tanzania | National Assembly | Unicameral |
| United States of America | House of Representatives, Senate | Bicameral |
| Uruguay | House of Representatives, Senate | Bicameral |
| Uzbekistan | Legislative Chamber, Senate | Bicameral |
| Vanuatu | Parliament | Unicameral |
| Venezuela (Bolivarian Republic of) | National Assembly | Unicameral |
| Viet Nam | National Assembly | Unicameral |
| Yemen | House of Representatives, Shura Council | Bicameral |
| Zambia | National Assembly | Unicameral |
| Zimbabwe | National Assembly, Senate | Bicameral |