Free Databases (all subjects): Statistical Sources

A number of different databases from the U.S. Census Bureau.

Includes detailed statistics on nearly every metropolitan area in the US. Based on 2000 Census data.

Databases provided by the Bureau of the Census including: Annual Survey of Manufactures, Census Tract Street Locator, USA Counties 1996, and ZIP Code Business Patterns.

Find data about the U.S., such as demographic and economic data, population, and maps. Get information about the 2020 U.S. Census.

Data set Search, search engine to find data repositories on the web, and to local and national governments around the world.
This search engine leads to data sets wherever they’re hosted, whether it’s a publisher's site, a digital library, or an author's personal web page.

Provides free access to data and reports which document the impact of the Internet and technology on American life. The site also includes government information and policy resources related to the spread of the Internet.

From Cornell University