As of January 2023, the World Customs Organization has a total of 185 members. The European Communities (now: European Union) joined "on an interim basis akin to those enjoyed by WCO Members".

[World Customs Organization members and WCO regions in 2010: {{legend|#ff0000|North Africa, Near and Middle East}} {{legend|#808040|West and Central Africa}} {{legend|#00ff00|East and Southern Africa (Somalia and South Sudan joined in 2012)}} {{legend|#0000ff|The Americas (Suriname joined in 2018)}} {{legend|#008000|Europe}} {{legend|#80007f|Far East, South and South-East Asia, Australasia and Pacific islands (Solomon Islands joined in 2023)|undefined | upload.wikimedia.org/wikipedia/commons/9/96/World///Customs///Organization.png]

Members list with date of membership

The 185 WCO members include 179 United Nations member states, one United Nations General Assembly non-member observer state (the State of Palestine), as well as Kosovo and 4 customs territories which are dependent territories. Those 185 members and the European Union are divided into the following regional groups:

East and Southern Africa

Europe

Far East, South and South East Asia, Australasia and the Pacific Islands

North of Africa, Near and Middle East

South America, North America, Central America and the Caribbean

West and Central Africa

Non-Members

The following states and territories are not members of the WCO: United Nations member states States not members of the United Nations The following states with limited recognition are not members of the WCO: