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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. Amsterdam Institute for Advanced Labour Studies
    http://www.uva-aias.net/en/home

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

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

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

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

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

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

  18. Authoritarian Regimes Dataset
    https://sites.google.com/site/authoritarianregimedataset/

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

  20. Berlin Social Center
    https://www.wzb.eu/en

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

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

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

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

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

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

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

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

  29. Centre for the Study of African Economies
    http://www.csae.ox.ac.uk/

  30. Change in Source of Leader Support
    http://www.chisols.org/

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

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

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

  34. Climate Change and African Political Stability
    https://www.strausscenter.org/ccaps/

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

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

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

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

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

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

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

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

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

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

  45. Constituency-Level Elections Archive
    http://www.electiondataarchive.org/

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

  47. Continent of International Law, The
    http://www.isr.umich.edu/cps/coil/index.html

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

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

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

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

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

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

  54. Counter Trafficking Data Collaborative
    https://www.ctdatacollaborative.org/

  55. Danish General Election Results
    https://github.com/Straubinger/folketingsvalg

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

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

  58. Data on Governance
    https://www.prio.org/Data/Governance/

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

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

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

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

  63. Democracy Barometer
    http://www.democracybarometer.org/index.html

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

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

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

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

  68. Economic Freedom of the World
    https://www.fraserinstitute.org/economic-freedom/dataset

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

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

  71. Electoral System Family Map App
    https://ncb13.shinyapps.io/ParlElections/

  72. Electoral Systems and the Personal Vote
    http://hdl.handle.net/1902.1/17901

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

  74. Environmental Performance Index
    https://epi.envirocenter.yale.edu/

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

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

  77. Ethnic Power Relations Dataset
    http://www.columbia.edu/~aw2951/Datasets.html

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

  79. European Central Bank Statistical Data Warehouse
    http://sdw.ecb.europa.eu/

  80. European Data Center for Work and Welfare
    http://www.edac.eu/

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

  82. European Quality of Life Survey
    https://www.eurofound.europa.eu/surveys/european-quality-of-life-surveys

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

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

  85. Eurostat
    https://ec.europa.eu/eurostat/web/main/home

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

  87. Explaining Terrorist and Insurgent Behavior
    https://ic3jm.es/investigacion/proyectos/explaining-terrorist-and-insurgent-behavior/

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

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

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

  91. Fondazione Rodolfo Debenedetti Foundation
    http://www.frdb.org/page/frdb-rodolfo-debenedetti-foundation

  92. Fragile States Index
    http://fundforpeace.org/fsi/

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

  94. German Socio-Economic Panel
    https://www.eui.eu/Research/Library/ResearchGuides/Economics/Statistics/DataPortal/GSOEP

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

  96. Global Elections Database
    http://www.globalelectionsdatabase.com/index.php/index

  97. Global Integrity
    https://www.globalintegrity.org

  98. Global Media Freedom Dataset
    http://faculty.uml.edu/Jenifer_whittenwoodring/MediaFreedomData_000.aspx

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

  100. Global State of Democracy Indices
    https://www.idea.int/gsod-indices/#/indices/world-map

  101. Global State Revenues and Expenditures
    https://sites.google.com/a/thomaserichter.de/gsre/

  102. Global Terrorism Database
    http://www.start.umd.edu/gtd/

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

  104. Governance Indicators
    https://www.hertie-school.org/en/governancereport/govreport-indicators/

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

  106. Greifswald Comparative Politics
    http://comparativepolitics.uni-greifswald.de/index.html

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

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

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

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

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

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

  113. Ill-Treatment & Torture (ITT) Data Collection Project
    http://faculty.ucmerced.edu/cconrad2/Academic/ITT_Data_Collection.html

  114. Immigration Policies in Comparison
    http://www.impic-project.eu/

  115. Index of African Governance
    http://mo.ibrahim.foundation/iiag/downloads/

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

  117. Institute for Health Metrics
    http://www.healthdata.org/

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

  119. Institute of Citizenship Studies (InCite)
    https://www.unige.ch/sciences-societe/incite/welcome-to-the-incite-website/

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

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

  122. Inter-Parliamentary Union
    https://www.ipu.org/

  123. International Social Survey Programme
    http://www.issp.org/menu-top/home/

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

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

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

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

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

  129. KOF Swiss Economic Institute
    https://www.kof.ethz.ch/en/

  130. Konstanz One-Sided Event Dataset
    https://cms.uni-konstanz.de/fileadmin/archive/kosved/polver/gschneider/forschung/kosved.html

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

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

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

  134. LIS Cross-National Data Center
    http://www.lisdatacenter.org/

  135. Longitudinal Internet Studies for the Social sciences
    https://www.lissdata.nl/

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

  137. Macrohistory Lann Bonn
    http://www.macrohistory.net/

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

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

  140. Members of the European Parliament Survey Data
    https://mepsurvey.eu/

  141. Minorities at Risk Project
    http://www.mar.umd.edu

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

  143. Multiculturalism Policy Index
    https://www.queensu.ca/mcp/

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

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

  146. National Elections Across Democracy and Autocracy Dataset
    http://www.nelda.co/

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

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

  149. Norwegian Centre for Research Data
    http://www.nsd.uib.no/nsd/english/

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

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

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

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

  154. Peace Accords Matrix Implementation
    https://peaceaccords.nd.edu

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

  156. Pew Global Attitudes Surveys
    http://www.pewglobal.org/datasets/

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

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

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

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

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

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

  163. Political Terror Scale
    http://www.politicalterrorscale.org

  164. Political TV Ad Archive
    http://politicaladarchive.org

  165. Polity Project: Political Regime Characteristics and Transitions
    http://www.systemicpeace.org/polity/polity4.htm

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

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

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

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

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

  171. Project on Democratic Accountability and Citizen-Politician Linkages around the World
    https://sites.duke.edu/democracylinkage/

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

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

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

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

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

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

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

  179. Sexual Violence in Armed Conflict
    http://www.sexualviolencedata.org

  180. Sié Chéou-Kang Center for International Security & Diplomacy
    https://www.du.edu/korbel/sie/index.html

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

  182. Social Policy Indicators (SPIN)
    https://www.sofi.su.se/spin/

  183. State Antiquity Index
    http://www.brown.edu/Departments/Economics/Faculty/Louis_Putterman/antiquity index.htm

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

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

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

  187. Suicide Attack Database
    http://cpostdata.uchicago.edu/search_new.php

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

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

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

  191. Survey of Health, Ageing and Retirement in Europe
    http://www.share-project.org/home0.html

  192. Swedish National Data Service
    https://snd.gu.se/en

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

  194. Terrorism in Western Europe: Events Data
    http://folk.uib.no/sspje/tweed.htm

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

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

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

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

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

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

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

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

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

  204. United Nations Statistics Division
    https://unstats.un.org/home/

  205. United Nations University World Institute for Development Economics Research (UNU-WIDER)
    https://www.wider.unu.edu/database/additional-data-files-grd

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

  207. Uppsala Conflict Data Program
    http://ucdp.uu.se

  208. US Presidential Elections Data
    https://github.com/zonination/election-history

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

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

  211. Voter Turnout Database
    https://www.idea.int/data-tools/data/voter-turnout

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

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

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

  215. Wesleyan Media Project
    http://mediaproject.wesleyan.edu/

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

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

  218. World Inequality Database
    https://wid.world/

  219. World Justice Project
    https://worldjusticeproject.org/

  220. World Press Freedom Index
    https://rsf.org/en/ranking_table

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

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

  223. Worldwide Governance Indicators
    https://data.worldbank.org/data-catalog/worldwide-governance-indicators

  224. Zenobo - Open Access Data Repository
    https://zenodo.org/