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  1. Adjusted Interest Group Scores
    http://www.sscnet.ucla.edu/polisci/faculty/groseclose/Adj.Int.Group.Scores/

  2. Africa Information Highway
    http://dataportal.opendataforafrica.org/

  3. Afrobarometer Data Collection
    http://www.afrobarometer.org/data

  4. Agency Data
    http://agencydata.wordpress.com/

  5. AidData
    http://aiddata.org

  6. Aids Flows
    http://www.aidflows.org/

  7. American Ideology Project
    http://americanideologyproject.com/

  8. American Legislatures Project
    http://americanlegislatures.com/

  9. American National Election Studies
    http://www.electionstudies.org/

  10. American Presidency Project
    http://www.presidency.ucsb.edu/index.php

  11. Arab Barometer
    http://arabbarometer.org/

  12. Archigos
    http://www.rochester.edu/college/faculty/hgoemans/data.htm

  13. Armed Conflict Location & Event Data Project
    https://www.acleddata.com/

  14. Asian Barometer
    http://www.asianbarometer.org/

  15. Australian Election Study
    http://www.australianelectionstudy.org

  16. Austrian National Election Study
    http://www.autnes.at/en/

  17. Autocratic Regime Data
    http://sites.psu.edu/dictators/

  18. Biographical Directory of Members of Congress
    http://bioguide.congress.gov/biosearch/biosearch.asp

  19. British Election Study
    http://www.britishelectionstudy.com/

  20. British Election Study
    http://www.britishelectionstudy.com

  21. Brookings Institution Vital Statistics on Congress
    https://www.brookings.edu/multi-chapter-report/vital-statistics-on-congress/

  22. Canadian Election Study
    https://ces-eec.arts.ubc.ca/english-section/home/

  23. Caucasus Research Resource Centers
    http://caucasusbarometer.org/en/

  24. Census Data Center
    http://mcdc2.missouri.edu/

  25. Center for Systematic Peace Datasets
    http://www.systemicpeace.org/inscrdata.html

  26. Chapel Hill Expert Survey
    https://www.chesdata.eu/

  27. Charles Stewart's Congressional Data Page
    http://web.mit.edu/17.251/www/data_page.html

  28. CIRI Human Rights Dataset
    http://www.humanrightsdata.com/

  29. Comparative Constitutions Project
    http://comparativeconstitutionsproject.org/

  30. Comparative Political Data Set
    http://www.cpds-data.org/index.php

  31. Congress Roll Call Vote Indexes (101-112)
    http://thomas.loc.gov/home/rollcallvotes.html

  32. Congressional Bills Project
    http://www.congressionalbills.org/

  33. Congressional District Data
    https://sites.google.com/a/colorado.edu/adler-scott/data/congressional-district-data

  34. Congressional Voting Data
    https://dataverse.harvard.edu/dataset.xhtml?persistentId=hdl:1902.1/10533

  35. Constitute Project
    https://www.constituteproject.org/

  36. Cooperative Congressional Election Study
    http://dataverse.harvard.edu/dataverse/cces

  37. Correlates of State Policy Project
    http://www.ippsr.msu.edu/public-policy/correlates-state-policy

  38. Correlates of War Project Datasets
    http://www.correlatesofwar.org/data-sets

  39. Corruption Perceptions Index
    https://www.transparency.org/research/cpi/

  40. Cosponsorship Network Data
    http://jhfowler.ucsd.edu/cosponsorship.htm

  41. Data Foundation
    http://www.datafoundation.org/

  42. Database on Ideology, Money in Politics, and Elections
    http://data.stanford.edu/dime/

  43. Datasets on Democratic Deepening and Regression
    http://ps.au.dk/forskning/forskningsprojekter/dedere/datasets/

  44. Datorium from GESIS
    https://datorium.gesis.org/xmlui/

  45. David Lublin's Data for Download
    http://www1.american.edu/dlublin/research/data/data.html

  46. Development Economics Datasets
    http://devecondata.blogspot.com/

  47. Digest of Educational Statistics
    https://nces.ed.gov/programs/digest/

  48. Dutch Parliamentary Voting Dataset
    https://dataverse.harvard.edu/dataverse/dutchparl

  49. Economic data from the European Bank for Reconstruction and Development
    http://www.ebrd.com/what-we-do/economic-research-and-data/data.html

  50. Educational Attainment Dataset
    http://www.barrolee.com/

  51. Electoral Integrity Project
    https://www.electoralintegrityproject.com/

  52. Enterprise Surveys
    http://www.enterprisesurveys.org/

  53. Equality of Opportunity Project
    http://www.equality-of-opportunity.org/

  54. ERDDA.se Comparative Data Projects
    http://www.erdda.se/

  55. Eurobarometer Surveys
    http://ec.europa.eu/COMMFrontOffice/publicopinion/index.cfm/General/index

  56. European Election Studies
    http://europeanelectionstudies.net/

  57. European Social Survey
    http://www.europeansocialsurvey.org/

  58. European Values Study
    http://www.europeanvaluesstudy.eu/

  59. Executive Order Data
    http://www.archives.gov/federal-register/executive-orders/

  60. Federal Election Commission's Campaign Finance Reports and Data
    http://www.fec.gov/disclosure.shtml

  61. Federal Judicial Center Biographical Database
    http://www.fjc.gov/history/home.nsf/page/judges.html

  62. FedStats Web Site
    http://www.fedstats.gov/

  63. General Social Survey
    http://gss.norc.org

  64. GESIS: Data Archive for the Social Sciences
    http://www.gesis.org/en/institute/gesis-scientific-departments/data-archive-for-the-social-sciences/

  65. Global Parliamentary Report
    http://archive.ipu.org/dem-e/gpr.htm

  66. Google Ngram
    https://books.google.com/ngrams

  67. GovTrack.us
    http://www.govtrack.us/

  68. Groningen Growth and Development Centre (GGDC)
    https://www.rug.nl/ggdc/

  69. GROWup - Geographical Research On War, Unified Platform
    http://growup.ethz.ch/

  70. Harvard Election Data Archive
    http://projects.iq.harvard.edu/eda/home

  71. High Courts Judicial Database
    http://artsandsciences.sc.edu/poli/juri/highcts.htm

  72. Historical Reported Voting Rates
    http://www.census.gov/data/tables/time-series/demo/voting-and-registration/voting-historical-time-series.html

  73. ICPSR Web Site
    http://www.icpsr.umich.edu/icpsrweb/ICPSR/

  74. Institute for Democracy and Electoral Assistance Datasets
    https://www.idea.int/data-tools

  75. Institute for Social and Economic Research
    https://www.iser.essex.ac.uk/

  76. Institutional Quality Dataset
    https://sites.google.com/site/aljazkuncic/research

  77. Institutions and Elections Project
    https://havardhegre.net/iaep/

  78. IQSS Dataverse Network
    http://dvn.iq.harvard.edu/dvn/

  79. Israel National Election Studies
    http://www.ines.tau.ac.il/

  80. Judicial Research Initiative
    http://www.cas.sc.edu/poli/juri/

  81. Kaggle Datasets Collection
    https://www.kaggle.com/datasets

  82. KOF Index of Globalization
    http://globalization.kof.ethz.ch/

  83. Latin American Public Opinion Project
    https://www.vanderbilt.edu/lapop/

  84. Latinobarometro
    http://www.latinobarometro.org/lat.jsp

  85. Legislative Effectiveness Project (LEP)
    http://www.thelawmakers.org

  86. MacroDataGuide
    http://www.nsd.uib.no/macrodataguide/index.html

  87. Maddison Project Database
    http://www.ggdc.net/maddison/maddison-project/data.htm

  88. Manifesto Project Database
    http://manifestoproject.wzb.eu/

  89. NatCen Social Research
    http://www.natcen.ac.uk/

  90. National Conference of State Legislatures
    http://www.ncsl.org/

  91. North Carolina Center for Public Policy Research
    http://www.nccppr.org/drupal/

  92. Open ICSPR
    https://www.openicpsr.org/openicpsr/

  93. Open States by the Sunlight Foundation
    http://openstates.org/

  94. ParlGov Parliaments and Governments Database
    http://www.parlgov.org/

  95. Party Government Data Set
    https://fsw.vu.nl/en/departments/political-science-and-public-administration/staff/woldendorp/party-government-data-set/index.aspx

  96. Penn World Table
    http://www.rug.nl/ggdc/productivity/pwt/

  97. Pew Research Center Datasets
    http://www.pewresearch.org/data/

  98. Policy Agendas Project
    http://www.policyagendas.org/

  99. Political Data Yearbook
    http://www.politicaldatayearbook.com/

  100. Political Institutions and Public Choice Program Data
    http://sites.duke.edu/pipc/data/

  101. PollBase
    https://www.markpack.org.uk/opinion-polls/

  102. Presidency Research
    http://presdata.tamu.edu/

  103. Presidential Power Scores
    http://presidential-power.com/?page_id=2148

  104. Presidential Research Group Data Sites
    http://cstl-cla.semo.edu/renka/PRG/PRG_presidencydata.asp

  105. Qualitative Data Repository
    http://qdr.syr.edu/

  106. Quality of Government Institute
    http://qog.pol.gu.se/

  107. Quandl
    https://www.quandl.com/

  108. Reddit Datasets
    http://www.reddit.com/r/datasets

  109. Religion and State Project Constitutions Dataset
    http://www.thearda.com/archive/files/Descriptions/RASCONS.asp

  110. Religion Data Archives
    http://www.thearda.com/Archive/browse.asp

  111. Religious Data: Association of Religious Data Archives
    http://www.thearda.com/Archive/browse.asp

  112. Social Feed Manager
    http://gwu-libraries.github.io/sfm-ui/

  113. State of First Amendment Surveys
    http://www.firstamendmentcenter.org/sofa/

  114. State Policy Index
    http://www.statepolicyindex.com/

  115. StateMaster.com
    http://www.statemaster.com/index.php

  116. Supreme Court Citation Network Data
    http://jhfowler.ucsd.edu/judicial.htm

  117. Supreme Court Database
    http://scdb.wustl.edu/

  118. Survey Documentation and Analysis
    http://sda.berkeley.edu/index.html

  119. Swedish National Election Studies
    http://valforskning.pol.gu.se/english

  120. The Political Constraint Index (POLCON) Dataset
    https://mgmt.wharton.upenn.edu/faculty/heniszpolcon/polcondataset/

  121. TRAC Immigration Tool
    http://trac.syr.edu/phptools/reports/reports.php?layer=immigration&report_type=tool

  122. Transitional Justice Research Collaborative
    https://transitionaljusticedata.com/

  123. Transparency International
    https://www.transparency.org/research/

  124. U.S. Census Bureau: Data Web
    http://www.thedataweb.org/

  125. U.S. Elections Project
    http://www.electproject.org/

  126. U.S. House Election Results Archive
    http://clerk.house.gov/member_info/electionInfo/index.aspx

  127. UCDP/PRIO Armed Conflict Dataset
    https://www.prio.org/Data/Armed-Conflict/UCDP-PRIO/

  128. UK Household Longitudinal Study
    https://www.understandingsociety.ac.uk/

  129. United States Election Project
    http://www.electproject.org/home

  130. V-Dem (Varieties of Democracy)
    https://www.v-dem.net/en/

  131. Vetoes by U.S. Presidents, 1789-present
    http://www.senate.gov/reference/Legislation/Vetoes/vetoCounts.htm

  132. Voteview (UCLA)
    https://voteview.com/

  133. Voteview.com
    http://www.voteview.com/index.asp

  134. Voting Technology Project Data
    http://www.votingtechnologyproject.org/data

  135. World Bank Open Data
    https://data.worldbank.org/

  136. World Bank's Data Catalog
    http://datacatalog.worldbank.org/

  137. World Values Survey
    http://www.worldvaluessurvey.org/wvs.jsp

  138. World Values Survey
    http://www.worldvaluessurvey.org/wvs.jsp