 Yokohama, Japan - since 1973- Osaka, Japan - 1974
 Milan, Italy - 1979 Rotterdam, the Netherlands - 1979 San Francisco, United States - 1979- Osaka Prefecture, Japan - 1980
 Zagreb, Croatia - 1980 Hamhung, North Korea - 1982 Manila, Philippines - 1983.svg/22px-Flag_of_Belgium_(civil).svg.png) Antwerp, Belgium - 1984 Karachi, Pakistan - 1984- Chicago, United States - 1985
 Montreal, Canada - 1985 Piraeus, Greece - 1985 Gdansk, Poland - 1985- Nagasaki Prefecture, Japan - 1986
 Hamburg, Germany - 1986 Casablanca, Morocco - 1986 Gothenburg, Sweden - 1986 Marseille, France - 1987 São Paulo, Brazil - 1988 Saint Petersburg, Russia - 1988 Istanbul, Turkey - 1989 Ho Chi Minh City, Vietnam - 1990 Alexandria, Egypt - 1992 Busan, South Korea - 1993 Port Vila, Vanuatu - 1994 Dunedin, New Zealand - 1994 Haifa, Israel - 1994 Tashkent, Uzbekistan - 1994
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 Porto, Portugal - 1995 Aden, Yemen - 1995 Windhoek, Namibia - 1995 London, United Kingdom - 1996 Santiago de Cuba, Cuba - 1996 Rosario, Argentina - 1997 Espoo, Finland - 1998 Jalisco State, Mexico - 1998- Liverpool, United Kingdom - 1999
 Maputo, Mozambique - 1999 Dubai, United Arab Emirates - 2000 Chiangmai, Thailand - 2000 KwaZulu Natal, South Africa - 2001 Guayaquil, Ecuador - 2001 Valparaiso, Chile - 2001 Barcelona, Spain - 2001 Oslo, Norway - 2001 Constanţa, Romania - 2002 Algiers, Algeria - 2003 Colombo, Sri Lanka - 2003 Aarhus County, Denmark - 2003 Bratislava Region, Slovakia - 2003- Hauraki District, New Zealand - 2003
 Salzburg, Austria - 2004 Lefkosia, Cyprus - 2004 Cork, Ireland - 2005- Winston-Salem, United States - 2006
 Basel, Switzerland - 2007 Sarajevo, Bosnia and Herzegovina - 2008
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