<center>
{| class="wikitable" align=center
!align=right| Nr. || Sted || Dato || ''Hjemmeside''
|-
| align=right| &nbsp;1&nbsp; || &nbsp;[[Braşov]] og [[Bukarest]], [[Rumænien]]&nbsp; || &nbsp;23.07 - 31.07, 1959&nbsp; || 
|-
| align=right| &nbsp;2&nbsp; || &nbsp;[[Sinaia]], [[Rumænien]]&nbsp; || &nbsp;18.07 - 25.07, 1960&nbsp; || 
|-
| align=right| &nbsp;3&nbsp; || &nbsp;[[Veszprém]], [[Ungarn]]&nbsp; || &nbsp;06.07 - 16.07, 1961&nbsp; || 
|-
| align=right| &nbsp;4&nbsp; || &nbsp;[[České Budějovice]], [[Tjekkoslovakiet]]&nbsp; || &nbsp;07.07 - 15.07, 1962&nbsp; || 
|-
| align=right| &nbsp;5&nbsp; || &nbsp;[[Warszawa]] og [[Wrocław]], [[Polen]]&nbsp; || &nbsp;05.07 - 13.07, 1963&nbsp; || 
|-
| align=right| &nbsp;6&nbsp; || &nbsp;[[Moskva]], [[Sovjetunionen]]&nbsp; || &nbsp;30.06 - 10.07, 1964&nbsp; || 
|-
| align=right| &nbsp;7&nbsp; || &nbsp;[[Berlin]], [[DDR]]&nbsp; || &nbsp;03.07 - 13.07, 1965&nbsp; || 
|-
| align=right| &nbsp;8&nbsp; || &nbsp;[[Sofia]], [[Bulgarien]]&nbsp; || &nbsp;03.07 - 13.07, 1966&nbsp; || 
|-
| align=right| &nbsp;9&nbsp; || &nbsp;[[Cetinje]], [[Jugoslavien]]&nbsp; || &nbsp;02.07 - 13.07, 1967&nbsp; || 
|-
| align=right| &nbsp;10&nbsp; || &nbsp;[[Moskva]], [[Sovjetunionen]]&nbsp; || &nbsp;05.07 - 18.07, 1968&nbsp; || 
|-
| align=right| &nbsp;11&nbsp; || &nbsp;[[Bukarest]], [[Rumænien]]&nbsp; || &nbsp;05.07 - 20.07, 1969&nbsp; || 
|-
| align=right| &nbsp;12&nbsp; || &nbsp;[[Keszthely]], [[Ungarn]]&nbsp; || &nbsp;08.07 - 22.07, 1970&nbsp; || 
|-
| align=right| &nbsp;13&nbsp; || &nbsp;[[Žilina]], [[Tjekkoslovakiet]]&nbsp; || &nbsp;10.07 - 21.07, 1971&nbsp; || 
|-
| align=right| &nbsp;14&nbsp; || &nbsp;[[Toruń]], [[Polen]]&nbsp; || &nbsp;05.07 - 17.07, 1972&nbsp; || 
|-
| align=right| &nbsp;15&nbsp; || &nbsp;[[Moskva]], [[Sovjetunionen]]&nbsp; || &nbsp;05.07 - 16.07, 1973&nbsp; || 
|-
| align=right| &nbsp;16&nbsp; || &nbsp;[[Erfurt]] og [[Østberlin]], [[DDR]]&nbsp; || &nbsp;04.07 - 17.07, 1974&nbsp; || 
|-
| align=right| &nbsp;17&nbsp; || &nbsp;[[Burgas]] og [[Sofia]], [[Bulgarien]]&nbsp; ||  align=center| &nbsp;03.07 - 16.07, 1975&nbsp; || 
|- 
| align=right| &nbsp;18&nbsp; || &nbsp;[[Lienz]], [[Østrig]]&nbsp; ||  align=center| &nbsp;07.07 - 21.07, 1976&nbsp; || 
|-
| align=right| &nbsp;19&nbsp; || &nbsp;[[Beograd]], [[Jugoslavien]]&nbsp; || &nbsp;01.07 - 13.07, 1977&nbsp; || 
|-
| align=right| &nbsp;20&nbsp; || &nbsp;[[Bukarest]], [[Rumænien]]&nbsp; ||  align=center| &nbsp;03.07 - 10.07, 1978&nbsp; || 
|-
| align=right| &nbsp;21&nbsp; || &nbsp;[[London]], [[Storbritannien]]&nbsp; ||  align=center| &nbsp;30.06 - 09.07, 1979&nbsp; || 
|-
| align=right| &nbsp;22&nbsp; || &nbsp;[[Washington, D.C.|Washington, DC]], [[USA]]&nbsp; || &nbsp;08.07 - 20.07, 1981&nbsp; || 
|-
| align=right| &nbsp;23&nbsp; || &nbsp;[[Budapest]], [[Ungarn]]&nbsp; || &nbsp;05.07 - 14.07, 1982&nbsp; || 
|-
| align=right| &nbsp;24&nbsp; || &nbsp;[[Paris]], [[Frankrig]]&nbsp; || &nbsp;01.07 - 12.07, 1983&nbsp; || 
|-
| align=right| &nbsp;25&nbsp; || &nbsp;[[Prag]], [[Tjekkoslovakiet]]&nbsp; || &nbsp;29.06 - 10.07, 1984&nbsp; || 
|-
| align=right| &nbsp;26&nbsp; || &nbsp;[[Joutsa]], [[Finland]]&nbsp; || &nbsp;29.06 - 11.07, 1985&nbsp; || 
|-
| align=right| &nbsp;27&nbsp; || &nbsp;[[Warszawa]], [[Polen]]&nbsp; || &nbsp;04.07 - 15.07, 1986&nbsp; || 
|-
| align=right| &nbsp;28&nbsp; || &nbsp;[[Havana]], [[Cuba]]&nbsp; || &nbsp;05.07 - 16.07, 1987&nbsp; || 
|-
| align=right| &nbsp;29&nbsp; || &nbsp;[[Sydney]] og [[Canberra]], [[Australien]]&nbsp; || &nbsp;09.07 - 21.07, 1988&nbsp; || 
|-
| align=right| &nbsp;30&nbsp; || &nbsp;[[Braunschweig]], [[Vesttyskland]]&nbsp; || &nbsp;13.07 - 24.07, 1989&nbsp; || 
|-
| align=right| &nbsp;31&nbsp; || &nbsp;[[Beijing]], [[Kina]]&nbsp; || &nbsp;08.07 - 19.07, 1990&nbsp; || 
|-
| align=right| &nbsp;32&nbsp; || &nbsp;[[Sigtuna]], [[Sverige]]&nbsp; || &nbsp;12.07 - 23.07, 1991&nbsp; || 
|-
| align=right| &nbsp;33&nbsp; || &nbsp;[[Moskva]], [[Rusland]]&nbsp; || &nbsp;10.07 - 21.07, 1992&nbsp; || 
|-
| align=right| &nbsp;34&nbsp; || &nbsp;[[Istanbul]], [[Tyrkiet]]&nbsp; || &nbsp;13.07 - 24.07, 1993&nbsp; || 
|-
| align=right| &nbsp;35&nbsp; || &nbsp;[[Hong Kong]]&nbsp; || &nbsp;08.07 - 20.07, 1994&nbsp; || 
|-
| align=right| &nbsp;36&nbsp; || &nbsp;[[Toronto]], [[Canada]]&nbsp; || &nbsp;13.07 - 25.07, 1995&nbsp; ||  align=center| &nbsp;[http://imo.math.ca/IMO95/] {{Webarchive|url=https://web.archive.org/web/20080229050644/http://imo.math.ca/IMO95/ |date=29. februar 2008 }}&nbsp;
|-
| align=right| &nbsp;37&nbsp; || &nbsp;[[Mumbai]], [[Indien]]&nbsp; || &nbsp;05.07 - 17.07, 1996&nbsp; ||  align=center| &nbsp;[http://imo.math.ca/IMO96/] {{Webarchive|url=https://web.archive.org/web/20080223074256/http://imo.math.ca/IMO96/ |date=23. februar 2008 }}&nbsp;
|-
| align=right| &nbsp;38&nbsp; || &nbsp;[[Mar del Plata]], [[Argentina]]&nbsp; || &nbsp;18.07 - 31.07, 1997&nbsp; ||  align=center| &nbsp;[http://oma.org.ar/imo97/]&nbsp;
|-
| align=right| &nbsp;39&nbsp; || &nbsp;[[Taipei]], [[Republikken Kina]]&nbsp; || &nbsp;10.07 - 21.07, 1998&nbsp; ||  align=center| &nbsp;[http://imo.math.ntnu.edu.tw/] {{Webarchive|url=https://web.archive.org/web/19981205203518/http://imo.math.ntnu.edu.tw/ |date= 5. december 1998 }}&nbsp;
|-
| align=right| &nbsp;40&nbsp; || &nbsp;[[Bukarest]], [[Rumænien]]&nbsp; || &nbsp;10.07 - 22.07, 1999&nbsp; ||  align=center| &nbsp;[http://imo.math.ca/IMO99/] {{Webarchive|url=https://web.archive.org/web/20080223162939/http://imo.math.ca/IMO99/ |date=23. februar 2008 }}&nbsp;
|-
| align=right| &nbsp;41&nbsp; || &nbsp;[[Daejeon]], [[Sydkorea]]&nbsp; || &nbsp;13.07 - 25.07, 2000&nbsp; ||  align=center| &nbsp;[http://imo.math.ca/IMO2000/] {{Webarchive|url=https://web.archive.org/web/20060414155942/http://imo.math.ca/IMO2000/ |date=14. april 2006 }}&nbsp;
|-
| align=right| &nbsp;42&nbsp; || &nbsp;[[Washington, D.C.|Washington, DC]], [[United States]]&nbsp; || &nbsp;01.07 - 14.07, 2001&nbsp; ||  align=center| &nbsp;[http://imo.wolfram.com/]&nbsp;
|-
| align=right| &nbsp;43&nbsp; || &nbsp;[[Glasgow]], [[Storbritannien]]&nbsp; || &nbsp;19.07 - 30.07, 2002&nbsp; ||  align=center| 
|-
| align=right| &nbsp;44&nbsp; || &nbsp;[[Tokyo]], [[Japan]]&nbsp; || &nbsp;07.07 - 19.07, 2003&nbsp; ||  align=center| &nbsp;[http://www.imo2003.com/] {{Webarchive|url=https://web.archive.org/web/20080306061006/http://www.imo2003.com/ |date= 6. marts 2008 }}&nbsp;
|-
| align=right| &nbsp;45&nbsp; || &nbsp;[[Athen]], [[Grækenland]]&nbsp; || &nbsp;06.07 - 18.07, 2004&nbsp; ||  align=center| &nbsp;[http://www.imo2004.gr/]&nbsp;
|-
| align=right| &nbsp;46&nbsp; || &nbsp;[[Mérida, Yucatán|Mérida]], [[Mexico]]&nbsp; || &nbsp;08.07 - 19.07, 2005&nbsp; ||  align=center| &nbsp;[http://erdos.fciencias.unam.mx/] {{Webarchive|url=https://web.archive.org/web/20050711000638/http://erdos.fciencias.unam.mx/ |date=11. juli 2005 }}&nbsp;
|-
| align=right| &nbsp;47&nbsp; || &nbsp;[[Ljubljana]], [[Slovenien]]&nbsp; || &nbsp;06.07 - 18.07, 2006&nbsp; ||  align=center| &nbsp;[http://imo2006.dmfa.si/]&nbsp;
|-
| align=right| &nbsp;48&nbsp; || &nbsp;[[Hanoi]], [[Vietnam]]&nbsp; || &nbsp;19.07 - 31.07, 2007&nbsp; ||  align=center| &nbsp;[http://www.imo2007.edu.vn/]&nbsp;
|}
</center>
Matematik