In 2011, the cities of Tokyo (host of the 1964 Summer Olympics), Qingdao (host of the sailing competition during the 2008 Summer Olympics), Atlanta (host of the 1996 Summer Olympics) and Nanjing (host of the 2014 Summer Youth Olympics) became active members of the World Union of Olympic Cities. 

Durban, Rotterdam, and Reno has joined the association as invited members. 

The World Union of Olympic Cities has now 28 members.