33 independent nations of the Americas are member states of the Organization of American States (OAS); Cuba and Nicaragua are the only exceptions, although they were both formerly member states.[1]
When formed on 5 May 1948 there were 21 members of the OAS. The organization's membership expanded as other nations in the Americas gained full political independence as sovereign states.
| Nation | Capital | Year joined | GDP (PPP) per capita (2020)[2] | HDI 2018 est. for 2017[3] | Official or National languages | |||
|---|---|---|---|---|---|---|---|---|
| 1981 | 1.78 | $18,241 | 0.780 | English | ||||
| 1948 | 716 | $20,771 | 0.825 | Spanish | ||||
| 1982 | 11.8 | $32,538 | 0.807 | English | ||||
| 1967 | 7.169 | $13,349 | 0.800 | English | ||||
| 1991 | 2.38 | $6,458 | 0.708 | English | ||||
| Bolivia | 1948 | 55.4 | $8,275 | 0.693 | Spanish | |||
| 1948 | 3,012 | $14,835 | 0.759 | Portuguese | ||||
| 1990 | 1,519 | $46,611 | 0.926 | English and French | ||||
| 1948 | 386 | $25,110 | 0.843 | Spanish | ||||
| 1948 | 598 | $14,931 | 0.747 | Spanish | ||||
| Costa Rica | 1948 | 64 | $22,132 | 0.794 | Spanish | |||
| 1979 | 0.91 | $10,853 | 0.715 | East Caribbean dollar | English | |||
| 1948 | 200 | $17,935 | 0.736 | Spanish | ||||
| 1948 | 165 | $10,895 | 0.752 | United States dollar | Spanish | |||
| 1948 | 45 | $8,420 | 0.674 | United States dollar | Spanish | |||
| 1975 | 1.142 | $15,283 | 0.772 | English | ||||
| 1948 | 113 | $8,853 | 0.650 | Spanish | ||||
| 1991 | 2.70 | $19,704 | 0.654 | English | ||||
| Haiti | 1948 | 13 | $3,095 | 0.498 | French | |||
| 1948 | 33 | $5,420 | 0.617 | Spanish | ||||
| 1969 | 21 | $9,241 | 0.732 | English | ||||
| 1948 | 2,014 | $18,444 | 0.774 | Spanish | ||||
| 1948 | 64 | $26,782 | 0.789 | United States dollar | Spanish | |||
| 1948 | 41 | $13,069 | 0.702 | Spanish | ||||
| 1948 | 358 | $11,878 | 0.750 | Spanish | ||||
| 1984 | 0.97 | $25,653 | 0.778 | English | ||||
| 1979 | 2.02 | $12,709 | 0.747 | English | ||||
| 1981 | 1.20 | $12,705 | 0.723 | English | ||||
| 1977 | 4.7 | $16,734 | 0.720 | |||||
| 1967 | 35.6 | $25,023 | 0.784 | English | ||||
| 1948 | 16,800 | $63,593 | 0.924 | English | ||||
| 1948 | 62 | $22,793 | 0.804 | Spanish | ||||
| 1948 | 553 | $5,177[4] | 0.761 | Spanish |
| Nation | Capital | Year joined | GDP (PPP) per capita (2020) | HDI 2018 est. for 2017 | Official or National languages | |||
|---|---|---|---|---|---|---|---|---|
| 1948 | 212 | No data | 0.777 | Spanish | ||||
| 1948 | 24.39 | $5,569 | 0.658 | Spanish |
The following jurisdictions are not members of the OAS as each is a dependent territory of another nation. They are grouped under the nation that has sovereignty over them.
The observer states are:[5]