Established in 2005, ACBS has about 9,000 members.<ref>{{cite web|url=http://contextualscience.org/acbs|title=ACBS - Association for Contextual Behavioral Science|author=|date=|publisher=|accessdate=14 February 2022}}</ref> Slightly more than one half are outside of the United States. There are 4445 ACBS chapters<ref>{{cite web|url=https://contextualscience.org/chapters|title=ACBS - Association for Contextual Behavioral Science|author=|date=|publisher=|accessdate=14 SeptemberFebruary 20172022}}</ref> covering many areas of the world including Italy,<ref>{{cite web|url=http://www.act-italia.org/doceboCms/|title=ACT-Italia.org|accessdate=11 September 2016|archive-url=https://web.archive.org/web/20160913204031/http://www.act-italia.org/doceboCms/|archive-date=13 September 2016|url-status=dead}}</ref> Japan,<ref>{{cite web|url=http://www.act-japan-acbs.jp/|title=ACT Japan - The Japanese Association for Contextual Behavioral Science|author=|date=|publisher=|accessdate=11 September 2016}}</ref> Belgium, the Netherlands,<ref>{{cite web|url=http://www.acbsbene.nl/|title=ACBS BeNe - Nederlandstalige Chapter|author=|date=|publisher=|accessdate=11 September 2016}}</ref> Brazil, Australia/New Zealand,<ref>{{cite web|url=http://anzact.com/|title=ANZ ACBS Annual Conference 2014 - ANZ ACBS|author=|date=|publisher=|accessdate=11 September 2016}}</ref> France,<ref>{{cite web|url=http://300gp.ovh.net/~actfranc/ACT/index.php?option=com_content&view=article&id=140&Itemid=29|title=AFSCC|first=Benjamin|last=Schoendorff|date=|publisher=|accessdate=11 September 2016|archive-url=https://web.archive.org/web/20160604113122/http://300gp.ovh.net/~actfranc/ACT/index.php?option=com_content&view=article&id=140&Itemid=29|archive-date=4 June 2016|url-status=dead}}</ref> the United Kingdom, Türkiye, Malaysia, and Turkeymore. Chapters exist in the United States and Canada as well, including the mid-Atlantic, New England, Washington, Ontario, and several other areas. There are also over 40 Special Interest Groups covering a wide range of basic and applied areas such as children and adolescents, veteran's affairs, ACT for Health, social work, and many other areas.
