Member states
  1. Twelve founding members

    The CERN convention was signed in 1953 by the 12…

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  2. Austria joins

    Austria signed as a member state of CERN on 1…

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  3. Spain joins

    From the minutes of the CERN council, dated 14…

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  4. Yugoslavia quits

    On 29 September 1961, the Federal Republic of…

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  5. Spain quits

    At the request of the Spanish government, Spanish…

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  6. Spain rejoins

    The return to CERN as a member state in 1983…

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  7. Portugal joins

    Portugal joined CERN as a member state in 1986.…

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  8. Finland joins

    On 1 January 1991, Finland joined CERN as the…

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  9. Poland joins

    The first contacts between Poland and CERN were…

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  10. Hungary joins. So does the Czech and Slovak Federal Republic

    Hungary Hungary joined CERN in 1992, but…

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  11. The Czech and Slovak Federal Republic ceases to exist

    By a letter dated 16 December 1992, the Permanent…

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  12. The Czech Republic and the Slovak Republic join

    The Czech Republic joins Statement of the…

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  13. Bulgaria joins

    Bulgaria became a full member state of CERN on 11…

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  14. Israel joins

    From CERN press release dated 15 January 2014…

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  15. Romania joins

    From CERN press release dated 17 July 2016: On…

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