Academic & Non-Profit Data Archives

• Inter-university Consortium for Political and Social Research
  University of Michigan
  Established in 1962, ICPSR is home of "the world's largest archive of computer-based research and instructional data for the social sciences."
• American National Election Studies
  University of Michigan
  Politics and electoral behavior.
• The Odum Institute for Research in Social Science
  University of North Carolina at Chapel Hill
  Includes National Network of State Polls (NNSP), Carolina Polls, Louis Harris & Associates Polls, southern polls and historical state data.
• Office of Survey Research
  The Annette Strauss Institute, University of Texas at Austin
  Links to several educational and institutional research sites within the United States as well as those worldwide.
• Roper Center for Public Opinion Research
  University of Connecticut
  Social science polls, presidential approval ratings and election analysis.

Media & National Polls

• The Gallup Organization
  Polls back to 1936.
• The Pew Research Center for the People & the Press
  Polls on politics, the media and American values back to 1995.
• PollingReport.com
  Polls on politics, business, and society.
• World Values Survey
  A worldwide investigation of socio-cultural and political change.
• Zogby International: Z-Files
  Collection of all summaries about recent and archived polls.

Associations

• American Association for Public Opinion Research
  "Code of Professional Ethics and Practices" and information on survey methods.
• Council of American Survey Research Organizations (CASRO)
  Trade organization for commercial survey research companies based in the United States.