59 national organisations in 31 OECD member countries are affiliated.

Membership is ca. 66 million.

Australia Australia
Austria Austria
Belgium Belgium
Canada Canada
Czech Republic Czech Republic
Denmark Denmark
Finland Finland
France France
Germany Germany
Greece Greece
Hungary Hungary
Iceland Iceland
Ireland Ireland
Israel Israel
Italy Italy
Japan Japan
Korea Korea
Luxembourg Luxemburg
Mexico Mexico
The Netherlands The Netherlands
New Zealand New Zealand
Norway Norway
Poland Poland
Portugal Portugal
Slovak Republic Slovak Republic
Spain Spain
Sweden Sweden
Switzerland Switzerland
Turkey Turkey
United Kingdom United Kingdom
USA United States of America

4 national organisations in 4 OECD non-member countries are associates.

Brazil Brazil
Indonesia Indonesia
Russia Russia
South Africa South Africa