databases of statistical information

Census and Demographics

U.S. Census Bureau

Census.gov

The main page for accessing data compiled by the U.S. Census Bureau.

American Fact Finder

The Census Bureau's gateway site to population, housing, economic and other data, down to a city, zip code census tract and block level. Select Data Sets in the menu on the left to see a list of available data.

State and County QuickFacts

National database of selected Census, American Community Survey and other economic, business, government and geogrpahical data for all states and counties, and for cities and towns with +25,000 people.

CenStats Databases

The U.S. Census Bureau provides access to databases related to building permits, imports/exports, employment and earnings (by county), occupational breakdowns by race, and other info.

TIGER map shape files

The U.S. Census Bureau provides map shape files that can be used to display census data. They can be merged with data in GIS programs or online mapping sites such as Google Fusion Tables.

IRE

Census.ire.org

Investigative Reporters and Editors has a tool that gives journalists an easier way to download 2010 Census data.

Minnesota Population Center

IPUMS USA

IPMUS, the Integrated Public Use Microdata Series at the University of Minnesota  compiles current and historic U.S. Census data at an online site that makes it easy to create custom data tables on a national, state and local level.

IRS

U.S. Population Migration Data

Numbers of people moving into or out of counties and states in the United States.

California Department of Finance

Demographic Research

Demographic data on California, including county data. Many of the datasets are downloadable as text or spreadsheet files.

Association of Bay Area Governments

Bay Area Census

Census data from 2010 for Bay Area counties, cities, census tracts and blocks, compiled by the Association of Bay Area Governments in partnership with the Metropolitan Transportation Commission. Includes historical data as far back as 1860.