Intergovernmental Organization Data, 1816-1964 (ICPSR 5520)

Published: Jan 19, 2015

Principal Investigator(s):
Michael Wallace, University of Michigan; J. David Singer, University of Michigan


Version V2

This data collection describes the membership status of 148 nations in 237 inter-governmental organizations (IGO) that were in place between 1815 and 1964. Each nation is coded at five-year intervals for membership type in each listed IGO, such as full or associate membership, as well as for membership or non-membership in the international system.

Wallace, Michael, and Singer, J. David. Intergovernmental Organization Data, 1816-1964. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2015-01-19.

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1816 -- 1964

Longitudinal: Panel

A total of 148 nations in 237 inter-governmental organizations that were active in the period 1815-1964.


intergovernmental organization

administrative records data



2015-01-19 SPSS, SAS, and Stata setup files, as well as SPSS and Stata system files, a SAS transport (CPORT) file, a tab-delimited data file, and an R data file have been added to the collection. The codebook was updated.

1984-05-03 ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major statistical software formats as well as standard codebooks to accompany the data. In addition to these procedures, ICPSR performed the following processing steps for this data collection:

  • Created variable labels and/or value labels.
  • Checked for undocumented or out-of-range codes.


  • Data in this collection are available only to users at ICPSR member institutions.

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