Compendia, Indexes and Portals
US, State, City
(links out to American Government & Politics guide)
Population, Housing, etc.
(links to the US Census guide)
(links out to the Polling and Public Opinion guide)
State Census Data (Historical)
(links out to Goverment Studies guide)
International Social Surveys
Surveying opinion, values, lifestyle (links out to Polling and Public Opinion guide)
This is a mix of raw datasets (requiring statistical software, codebooks, and statistical analysis skills) and tabulated data via databases or in companion reports (e.g. ACLED - Armed Conflict and Event Database http://www.acleddata.com/). Some are fee-based, but many are free.