The 192 members of the Universal Postal Union are listed below in alphabetical order, with the date of membership. Members are the Vatican City and the 193 UN members except Andorra, Marshall Islands, the Federated States of Micronesia, and Palau. The newest member is South Sudan, which joined on 4 October 2011. By virtue of article 23 of the UPU Constitution, other dependencies of UPU member states are covered by its membership. Territories covered by a sovereign member state are listed under that country.