From the Center for Governmental Studies (CGS).
PolicyArchive is an innovative, new digital archive of global, non-partisan public policy research.

A private nonprofit organization devoted to independent research and innovative policy solutions

The Cato Institute is a public policy research organization — a think tank — dedicated to the principles of individual liberty, limited government, free markets and peace. Its scholars and analysts conduct independent, nonpartisan research on a wide range of policy issues.

The Urban Institute gathers data, conducts research, evaluates programs, offers technical assistance overseas, and educates Americans on social and economic issues — to foster sound public policy and effective government.

Provides access to statistical data produced by U.S. Federal agencies, States, private organizations, and major intergovernmental organizations.

PolicyMap is a fully web-based Geographic Information System. You can even use our GIS mapping services to easily incorporate your own data and leverage it against the thousands of indicators already available in PolicyMap. Available data includes demographics, home sale statistics, health data, mortgage trends, school performance scores and labor data like unemployment, crime statistics and city crime rates.

Simplified version of American FactFinder. Has historical census data all the way back to 1790!
Has mapping capability.