Statistical Databases - Subscription through CC
- ICPSR: International Consortium for Political and Social Research This link opens in a new windowCoverage: N/A. Provides large data sets such as public opinion polls, attitude surveys, health information, results of research projects. Data may require use of specialized software such as SPSS or SAS.
- Social Explorer This link opens in a new windowDemographic data visualization and research tool. Includes U.S. census and election data from historical to current. See LibGuide by Social Explorer for more info.
- iPoll This link opens in a new windowCoverage: 1935 to present. U.S. and international poll data on social issues, politics, pop culture, international affairs, and more.
- Historical Statistics of the United States: Earliest Times to the Present This link opens in a new windowCoverage: 1600s - current. Annual time series of the U.S. population, economic indicators, social conditions, and government. From colonial times to the present.
Surveys
Gather your own statistics with surveys
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Free Sources of Statistics
U.S. statistics: 
- GSS: General Social Survey
- GSS at NORC (National Opinion Research Center) - download large data sets for analysis
- GSS at Berkeley SDA (Survey Documentation and Analysis) - compare specific variables, check out the Codebook for variables
- U.S. Census:
- U.S. Statistics: USA.gov
Colorado statistics:
- Quick Guide to Colorado State Government Statistical Information from Colorado Department of Education
- Colorado State Demography Office
- Colorado Health Institute
International statistics:
- Statistical Sites on the World Wide Web compiled by the U.S. Department of Labor, Bureau of Labor Statistics
- UNSD - Collection of databases from the U.N. Statistics Division
- World Databank - World Development Indicators (WDI) and Global Development Finance (GDF)
Free Datasets
Here are sources of datasets on a wide variety of subjects.
ARDA: Association of Religion Data Archives - data and GIS maps of religious denominations in the U.S. and worldwide
(U.S.) BLS - Bureau of Labor Statistics
GESIS - European and international data
Google Public Data - visualize data analysis.
NHIS - National Health Interview Survey
Pew Research Center - access to data sets available with free registration.
SAMHSA: Substance Abuse and Mental Health Services Administration Data
UNC Dataverse / Odum Institute Data Archive - open repository of social science data sets, including state-level polling data