Member states of the Union of South American Nations
There are four active member states of the Union of South American Nations after six member states suspended their participation in the organization in April 2018, while Ecuador and Uruguay announced their withdrawals in March 2019 and March 2020 respectively.
Member States
| Flag | Country | Capital | Area | Population | Density | Currency | GDP per cap. (PPP) | Gini | HDI | Official, National, & Recognized languages |
| Bolivia Estado Plurinacional de Bolivia Bulivya Mamallaqta Wuliwya Suyu | Sucre La Paz | /km2 | Bolivian boliviano | Spanish Quechua Aymara and 34 others also see Languages of Bolivia | ||||||
| Brazil República Federativa do Brasil | Brasília | /km2 | Brazilian real | Portuguese Brazilian Sign Language also see Languages of Brazil for other Co-official languages | ||||||
| Guyana Co-operative Republic of Guyana | Georgetown | /km2 | Guyanese dollar | English Guyanese Creole 11 other languages also see Languages of Guyana | ||||||
| Suriname Republiek Suriname | Paramaribo | /km2 | Surinamese dollar | Dutch also see Languages of Suriname | ||||||
| Venezuela República Bolivariana de Venezuela | Caracas | /km2 | Venezuelan bolívar | Spanish all other indigenous languages also see Languages of Venezuela |
Suspended states
Six member states suspended their participation in the organization in April 2018.| Flag | Country | Capital | Area | Population | Density | Currency | GDP per cap. (PPP) | Gini | HDI | Official, National, & Recognized languages |
| Argentina República Argentina | Buenos Aires | /km2 | Argentine peso | Spanish also see Languages of Argentina for other Co-official languages | ||||||
| Chile República de Chile | Santiago | /km2 | Chilean peso | Spanish also see Languages of Chile | ||||||
| Colombia República de Colombia | Bogotá | /km2 | Colombian peso | Spanish 68 other languages/dialects also see Languages of Colombia | ||||||
| Ecuador República del Ecuador | Quito | /km2 | Ecuadorian centavo United States dollar | Spanish also see Languages of Ecuador | ||||||
| Paraguay República del Paraguay Tetã Paraguái | Asunción | /km2 | Paraguayan guaraní | Spanish Guaraní also see Languages of Paraguay | ||||||
| Peru República del Perú Piruw Ripuwlika Piruw Suyu | Lima | /km2 | Peruvian sol | Spanish Quechuan Aymara all other indigenous languages also see Languages of Peru | ||||||
| Uruguay República Oriental del Uruguay | Montevideo | /km2 | Uruguayan peso | Spanish also see Languages of Uruguay |
On 28 August 2018, Colombian president Iván Duque announced that foreign minister Carlos Holmes had officially notified Unasur of their intention to leave the bloc, effective in 6 months, denouncing it as an institution created by Hugo Chávez to sideline existing international treaties and referring to it as an accomplice to what they referred to as the dictatorship in Venezuela. Ecuador announced its withdrawal on 13 March 2019. Uruguay followed suit in March 2020. Following the 2022 Brazilian general election, newly elected president Luiz Inácio Lula da Silva signalled his intention to rejoin UNASUR. Brazil rejoined on 5 May 2023.