American FactFinder provides access to data about the United States, Puerto Rico and the Island Areas. The data in American FactFinder come from several censuses and surveys
The Census Bureau's mission is to serve as the leading source of quality data about the nation's people and economy. (also listed as United States Census Bureau)
The Census Bureau is working to increase our use of visualization in making data available to the public, and this gallery is an early part of that effort. The first posted visualizations will pertain largely to historical population data, building on prior work done to portray historical changes in the growth and redistribution of the U.S. population. For later visualizations, the topics will expand beyond decennial census data to include the full breadth of Census Bureau data sets and subject areas, from household and family dynamics, to migration and geographic mobility, to economic indicators.(source: website)
Both USA and International IPUMS data sites are maintained by the Population Center at the University of Minnesota. The information is freely available thanks to funding provided by National Science Foundation; National Institutes of Health; and Stat/Transfer.
From Minnesota Population Center, University of Minnesota
Aggregate census data and GIS-compatible boundary files for the United States from 1790 to present.
NationMaster is where stats come alive! We are a massive central data source and a handy way to graphically compare nations.
From Minnesota Population Center, University of Minnesota
Census microdata from Canada, Denmark, Great Britain, Germany, Iceland, Norway, Sweden, and the United States from 1703 to 1911. Complete-count data from 1800s censuses of Canada, Great Britain, Germany, Iceland, Norway, Sweden, and the U.S.
This is the free edition of a popular subscription resource. The free edition provides access to data visualizations only (no table reports). Various data sources including American Community Survey and U.S. Census.
The European Union Open Data Portal is the single point of access to a growing range of data from the institutions and other bodies of the European Union (EU).
European data. Click the Data tab for a wealth of information.