Statistical Information Basics
Current U.S. Statistics 
ProQuest Statistical Insight
Indexes statistical data published in federal, state, and selected privately published titles, at the table level. In some cases the fulltext of the document is also available.Sources are listed for all tables, with more information available from the source.
Link:http://hdl.library.upenn.edu/1017/7045
FedStats
Gateway to statistics from over 100 U.S. Federal agencies. FedStats links to all of the major US Statistical Agencies including the Bureau of Labor Statistics, Bureau of Justice Statistics, and other Federal Agencies that produce or disseminate statistics.
Link:http://hdl.library.upenn.edu/1017/8748
American FactFinder
American FactFinder provides social, economic, housing, immigration and migration, and other data for the United States from recent Censuses, as well as from other major surveys conducted by the US Census Bureau.
Statistical Abstract of the United States
This publication, released every year between 1878-2011, brings together numbers and statistics from various U.S. government agencies.
Historical U.S. Statistics 
Decennials - Census of Population and Housing
PDF-format versions of historic US decennial census volumes, 1790 to present. Topics covered include basic counts of population and housing, with race and gender, for the nation, states, counties, townships and municipalities, and some small areas (e.g., wards).
Link: http://hdl.library.upenn.edu/1017/13026. Also see the Guide to US Census Documents - http://hdl.library.upenn.edu/1017/8102
Historical Census Browser
Population and housing data for all U.S. states and counties, 1790 to 1960, based on decennial census of population and housing. Provides basic counts of population and housing, including race, gender, and some measure of household size and composition. For 1840 to 1960, economic characteristics such as education and occupation are included. Later decades have many variables, including ancestry, literacy, and income variables.
Link: http://hdl.library.upenn.edu/1017/9168
Historical Statistics of the United States Millennial Edition
The best starting-place for statistical information on the United States, for the colonial era and 1790-2000 . Covers many topics, including population, work and welfare, economic structure and performance, business sectors and industries, government, and international trade and exchange rates.
Link:http://hdl.library.upenn.edu/1017/24261

International Statistics 
UNStats
Time series statistical information for countries collected from UN and related international governmental organizations. Country statistics on many subjects over time.
Link:http://hdl.library.upenn.edu/1017/7058
World Development Indicators
The World Bank's principal data source on the global economy. More than 550 time series, 1960-present, on more than 200 countries and 18 country groups, covering demographic, social, economic, financial, natural resources, and environmental indicators.
Link:http://hdl.library.upenn.edu/1017/7068
International Historical Statistics/B.R. Mitchell.
Most comprehensive compendium of historical international statistics. There are three volumes for the world, broken up by country.
Location: [the Americas, 1750-2000 Van Pelt Library Reference Stacks: HA175 .M55 2003]
Location: [Europe, 1750-2000 Van Pelt Library Reference Stacks: HA1107 .M5 2003]
Location: [Africa, Asia & Oceania, 1750-2000 Van Pelt Library Reference Stacks: HA4675 .M552 2003]
Additional Guides for Statistics