Member states of the World Customs Organization

As of today, the World Customs Organization has a total of 183 members. The European Communities (now: European Union) joined "on an interim basis akin to those enjoyed by WCO Members".
Members list with date of membership.
The 175 sovereign states, 4 customs territories and one customs union are divided into the following regional groups:
Non-Members.
The following United Nations member states are not members of the WCO: 
Sovereign States
Non-Sovereign member states
And the other states with limited recognition.