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To date there were 17 WCOA held in various countries around the world:

1904	St Louis, USA	1972	Sydney, Australia
1926	Amsterdam, Holland	1977	Munich, Germany
1929	New York, USA	1982	Mexico City, Mexico
1933	London, UK	1987	Tokyo, Japan
1938	Berlin, Germany	1992	Washington DC, USA
1952	London, UK	1997	Paris, France
1957	Amsterdam, Holland	2002	Hong Kong, PRC
1962	New York, USA	2006	Istanbul, Turkey
1967	Paris, France