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Data on IGOs from 1815-2014, at the country-year level. Contains one record per country-year (with years listed at 5 year intervals through 1965, and annually thereafter).


data frame with 15557 rows. Relevant fields:

  • ccode: COW country number, see states2016.

  • year: Calendar Year.

  • state: Abbreviated state name, identical to variable names in igo_year_format3.

  • aaaid...wassen: IGO variables containing information on state membership status. See Details.

See Codebook Version 3 IGO Data


Intergovernmental Organizations (v3), The Correlates of War Project (IGO Data Stata Files)


Possible value of the status of that state in the IGO are:

CategoryNumerical value
No Membership0
Full Membership1
Associate Membership2
Missing data-9
IGO Not In Existence-1


Raw data used internally by igoR.


Pevehouse, Jon CW, Timothy Nordstrom, Roseanne W McManus, and Anne Spencer Jamison. "Tracking Organizations in the World: The Correlates of War IGO Version 3.0 Datasets." Journal of Peace Research 57, no. 3 (May 2020): 492-503.

See also

countrycode::countrycode() to convert between different country code schemes.

Other datasets: igo_year_format3, states2016