United States

IPUMS USA collects, preserves and harmonizes U.S. census microdata and provides easy access to this data with enhanced documentation. Data includes decennial censuses from 1790 to 2010 and American Community Surveys (ACS) from 2000 to the present.

ICPSR is an international consortium of more than 750 academic institutions and research organizations, which maintains a data archive of more than 250,000 files of research in the social and behavioral sciences.

The Association of Religion Data Archives (ARDA) strives to democratize access to the best data on religion. Founded as the American Religion Data Archive in 1997 and going online in 1998, the initial archive was targeted at researchers interested in American religion.

IPUMS CPS harmonizes microdata from the monthly U.S. labor force survey, the Current Population Survey (CPS), covering the period 1962 to the present.

The NIS is the largest publicly available all-payer inpatient care database in the United States. It contains data from approximately 8 million hospital stays each year. The 2012 NIS was redesigned. The new NIS is a sample of discharges from all hospitals participating in HCUP.

These surveys measured national attitudes and beliefs about guns.

Forrester conducted a mail survey fielded in August and September 2008 of 5,314 US and Canadian households and individuals ages 18 and older.

The Pew Research Center is a nonpartisan "fact tank" that provides information on the issues, attitudes and trends shaping America and the world.

The dataset includes selected items from 207 public opinion surveys conducted as part of the Roper Reports series by the Roper Organization or its successor organization RoperASW between 1973 and 1994. More than 400,000 unique respondents are included in this cumulative file.