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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 Agendas Project
    https://www.comparativeagendas.net/

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

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

  32. Comparative Study of Electoral Systems
    http://www.cses.org/

  33. Comparative Welfare Entitlements Dataset
    http://cwed2.org/

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

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

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

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

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

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

  40. Cooperative Congressional Election Study
    https://cces.gov.harvard.edu/

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

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

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

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

  45. Danish National Election Study
    http://www.valgprojektet.dk/default.asp?l=eng

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  94. MIT Election Lab
    http://electionlab.mit.edu/

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

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

  97. New Nation Votes, A
    https://elections.lib.tufts.edu/

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  113. Princeton Gerrymandering Project
    http://gerrymander.princeton.edu/

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  129. The 'Most Important Problem' Dataset
    http://web.missouri.edu/~williamslaro/mipdata.html

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

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

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

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

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

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

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

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

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

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

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

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

  142. Voteview Legacy Website
    http://voteview.org/

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

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

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

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

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