– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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As of 14 November 2018, there are 59 Member States* and 42 Associate States and Economies.

*. The official term is "States Parties to the Metre Convention"; the term "Member States" is its synonym and used for easy reference.
Official and explanatory texts
Procedure for a State to become an Associate State of the CGPM
Notice of subscriptions
Calculating Associate subscriptions
NMI Directors and State Representatives