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Best Bets for Demographics: US & International
The Census Bureau is the leading source of quality data about the nation's people and economy. After July 1, 2019, all new data (previously released on American FactFinder) will be released on this new data platform.
International Statistical Agencies: US Census Bureau
Comprehensive list of direct links to international statistics and census agencies.
1960 - present. Provides access to the world's largest collection of publicly available individual-level census data and source documents from 1960 forward. Free registration required to view and download data.
United Nations: Demographic Yearbook
The United Nations Demographic Yearbook collects, compiles and disseminates official statistics on a wide range of topics, collected from national statistical authorities since 1948 through a set of questionnaires dispatched annually to over 230 national statistical offices.
US Census Bureau
US gov. census website; includes online tools to access and compare basic demographic data across most countries, dating back to 1950 if available.
World Bank: Integrated Public Use Microdata Series (IPUMS) International
Publicly available IPUMS data including census questionnaires, technical documents and reports that describe the survey process and the key results. Dating back to 1960, if available.