Statistics

General

Statistical Abstract of the United States 2013 Edition (previous editions available here)
ProQuest Statistical Insight
Statista
FedStats - official government gateway to federal statistical information
TableBase - retrieve tables published in newspapers, trade magazines, reports, etc.
State and Metropolitan Area Data Book
USA Counties
County and City Data Book
Government Statistics - a list of frequently used government sites compiled by GODORT (Government Documents Roundtable)

American FactFinder - use this website for easy access to data from the Decennial Census, the American Community Survey, the Economic Census, etc. (2000-present)
Historical Census Reports - PDFs from the Bureau of the Census
Missouri Census Data Center - an easy to use interface provides access to data for ALL states, not just Missouri, down to the block group level (1990-present)
Historical Census Browser - from the University of Virginia (1790-1960, data only available by state/county)
Other Census Bureau Publications

California Statistical Abstract - a compilation of data on social, economic, and physical aspects of the State
RAND California - use this resource to easily access California and U.S. data on a wide range of topics
SFGate Data Center - a collection datasets relating to San Francisco and the Bay Area, compiled by SFGate/The San Francisco Chronicle.

USAspending.gov
Budget of the United States Government
National Priorities Project - non-governmental, non-profit organization that tracks federal tax and spending policies
OMB Watch - a non-govermental, non-profit organization that monitors the Office of Management and Budget (OMB)
Fedspending.org - a database of government contracting and spending
Contractor Misconduct Database
OpenSecrets.org - provides data on money in national politics
OpenCongress.org: The Money Trail - looks at the role of money in congress (really helpful for finding the contributions of specific industries and interest groups)
MAPLight - a database which brings together campaign contributions with how legislators vote
Follow the Money - a database of campaign contributions at the state level
Cal-Access - provides financial information on California state candidates, donors, and lobbyists.
San Francisco Ethics Commission - the City's public portal for campaign finance
FundRace - a handy website for tracking campaign finance contributions
Office of Management and Budget: Earmarks Database
Taxpayers for Common Sense: Earmarks Database

Bureau of Economic Analysis - The BEA is an agency of the U.S. Department of Commerce. This website provides access to U.S. economic data.
Bureau of Labor Statistics
USA Trade Online
Export.gov - Market Research
STAT-USA - Links to Sources - While STAT-USA has officially ceased to exist, the University of Central Florida Libraries have created this lovely directory of resources to use instead. Thanks, UCF!

California: CIMIS (California Irrigation Management Information System)
National and International: NOAA National Data Center Online Please note: not all data provided at this website if available for free to the general public. USF has access to some additional data sets from the NOAA National Climatic Data Center (NCDC), but these are only accessible from within the library and you must be logged onto the NCDC website by a librarian. Please contact the Gleeson Library Reference Desk or email the government information librarian at csspector@usfca.edu in order to use the NCDC product.

For international statistics, please see our guide to International resources

Photo from AP Images