Sage Data Foundations is a dynamic tool which enables users to scan and search the contents of billions of datasets from the United States. Results can be compared and contrasted, and viewed in customizable tables, maps, rankings, and charts. Views also include descriptive summaries of the datasets and data sources. Sources include public, private/commercial, and nongovernmental organizations, as well as Woods & Poole Economics, Inc.
Social Explorer provides quick and easy access to modern and historical socioeconomic and demographic data, bringing together quantitative data with a visual interface to make demographic research, the analysis of social trends, and comparison of neighborhoods, communities, counties, and other areas accessible and interactive.
Statista is an online statistics portal providing access to data from market and opinion research institutions, as well as from business organizations and government institutions.
You can find data and statistics on virtually any topic from government departmental websites.
UPDATE: As of January 20, 2025, many government agencies have removed reports, documents, data sets, and other non-academic/grey literature sources from their web sites due to executive orders from the current administration.