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The OECD has 38 member countries. Costa Rica was the latest to join, in 2021.
20 + 18. The 20 founders of 1961 are Western Europe plus the US and Canada; the other 18 joined in waves, from Japan in 1964 to Costa Rica in 2021.
The European members of the OEEC plus the United States and Canada, under the Convention signed in Paris in December 1960; the OECD replaced the OEEC in 1961.
Japan 1964, Finland 1969, Australia 1971, New Zealand 1973.
Mexico 1994, Czechia 1995, Hungary, Poland and South Korea 1996, Slovakia 2000.
Chile, Slovenia, Israel and Estonia, all in 2010.
Latvia 2016, Lithuania 2018, Colombia 2020, Costa Rica 2021.
Can you name them all?
Test yourselfThe OECD has 38 member countries. Costa Rica was the latest to join, in 2021.
Austria, Belgium, Canada, Denmark, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, Turkey, United Kingdom, United States, Japan, Finland, Australia, New Zealand, Mexico, Czechia, Hungary, Poland, South Korea, Slovakia, Chile, Slovenia, Israel, Estonia, Latvia, Lithuania, Colombia and Costa Rica.
20 + 18. The 20 founders of 1961 are Western Europe plus the US and Canada; the other 18 joined in waves, from Japan in 1964 to Costa Rica in 2021.
No. The EU takes part in the OECD's work but is not a member.
No. Its bid to join was postponed in 2014 and ended in 2022.
Each name checked against at least two sources, one of them OECD, on 1 October 2026. Next review by 1 November 2026.
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