OECD: membership history 1961–2026
OECD began in 1961 with 19 members. In 2026 it had 38 members. Membership changed in 15 years, including the 1961 founding.
Source: The groupings’ own member lists and histories, 10 Nov 20261961–2026
Italy became a member in 1962, followed by Japan (1964), Finland (1969), Australia (1971) and New Zealand (1973). Mexico joined in 1994, Czechia in 1995, Hungary, Poland and South Korea in 1996, and Slovakia in 2000. Chile, Slovenia, Israel and Estonia joined in 2010, then Latvia (2016), Lithuania (2018), Colombia (2020) and Costa Rica (2021).
Drafted with AI from cited sources and reviewed by the editorMap. Arrow keys move the map, plus and minus zoom, N and P step through the countries with data, Enter opens the one shown, Escape clears the selection.
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Borders show who controls an area in practice, as drawn by Natural Earth. Disputed borders are dashed. Borders shown do not imply endorsement. How we treat borders
Timeline
| 1961 | Austria, Belgium, Canada, Switzerland, West Germany, Denmark, Spain, France, United Kingdom, Greece, Ireland, Iceland, Luxembourg, Netherlands, Norway, Portugal, Sweden, Türkiye and United States | – | 19 | The OECD replaced the Organisation for European Economic Co-operation. |
|---|---|---|---|---|
| 1962 | Italy | – | 20 | |
| 1964 | Japan | – | 21 | |
| 1969 | Finland | – | 22 | |
| 1971 | Australia | – | 23 | |
| 1973 | New Zealand | – | 24 | |
| 1994 | Mexico | – | 25 | |
| 1995 | Czechia | – | 26 | |
| 1996 | Hungary, South Korea and Poland | – | 29 | |
| 2000 | Slovakia | – | 30 | |
| 2010 | Chile, Estonia, Israel and Slovenia | – | 34 | |
| 2016 | Latvia | – | 35 | |
| 2018 | Lithuania | – | 36 | |
| 2020 | Colombia | – | 37 | |
| 2021 | Costa Rica | – | 38 |
Source: The groupings’ own member lists and histories, 10 Nov 20261961–2026
Every country that has been a member
| Austria | 1961 | 1961– |
|---|---|---|
| Belgium | 1961 | 1961– |
| Canada | 1961 | 1961– |
| Switzerland | 1961 | 1961– |
| Germany | 1961 | 1961– |
| Denmark | 1961 | 1961– |
| Spain | 1961 | 1961– |
| France | 1961 | 1961– |
| United Kingdom | 1961 | 1961– |
| Greece | 1961 | 1961– |
| Ireland | 1961 | 1961– |
| Iceland | 1961 | 1961– |
| Luxembourg | 1961 | 1961– |
| Netherlands | 1961 | 1961– |
| Norway | 1961 | 1961– |
| Portugal | 1961 | 1961– |
| Sweden | 1961 | 1961– |
| Türkiye | 1961 | 1961– |
| United States | 1961 | 1961– |
| Italy | 1962 | 1962– |
| Japan | 1964 | 1964– |
| Finland | 1969 | 1969– |
| Australia | 1971 | 1971– |
| New Zealand | 1973 | 1973– |
| Mexico | 1994 | 1994– |
| Czechia | 1995 | 1995– |
| Hungary | 1996 | 1996– |
| South Korea | 1996 | 1996– |
| Poland | 1996 | 1996– |
| Slovakia | 2000 | 2000– |
| Chile | 2010 | 2010– |
| Estonia | 2010 | 2010– |
| Israel | 2010 | 2010– |
| Slovenia | 2010 | 2010– |
| Latvia | 2016 | 2016– |
| Lithuania | 2018 | 2018– |
| Colombia | 2020 | 2020– |
| Costa Rica | 2021 | 2021– |