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For reliable facts and statistics, start with the data portal best matched to your subject and geography: the U.S. Census Bureau for U.S. population and community data, the Bureau of Labor Statistics for U.S. jobs and prices, and international portals such as World Bank Data, UNdata, WHO Data, and OECD statistics for cross-country topics. Before using any figure, check who produced it, what it measures, where and when it applies, and whether it is reported or estimated.
10 websites for facts and statistics
These are practical starting points, not a ranking. Some portals publish data directly; others bring together material from multiple organizations. Follow each result to its dataset, table, release, or original producer when accuracy or citation matters.
1. U.S. Census Bureau
data.census.gov is a useful starting point for U.S. population, household, community, and business statistics. Tables include a “Cite” feature, and Census guidance explains how to credit the source when you calculate your own estimates from Census data. Cite the underlying data and distinguish your analysis from the agency’s figures. Census citation guidance
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The Bureau of Labor Statistics (BLS) is a source for U.S. employment, labor force, wages, prices, and occupation data. For a specific figure, use the relevant BLS series or publication and check its definitions and release details. Census Bureau related-sites directory
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CDC WONDER lets users query U.S. public-health data, including mortality and births. Its help materials describe summary tables, maps, charts, downloadable results, and suggested citations that identify the dataset and release. CDC WONDER help
4. World Bank Data
World Bank Data is useful for development indicators and country comparisons. Its tools include search, topic and indicator browsing, downloads, charts, and API access. The guide describes data as free with minimal restrictions; check each indicator’s metadata and original source before comparing values. World Bank Data guide
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5. UNdata
UNdata is a broad international entry point for topics including agriculture, population, health, labor, education, trade, and the environment. The UN Statistics Division says the service aggregates databases from UN and other international agencies. UNdata republishes source-database content without modification and does not guarantee that every dataset suits every purpose, so follow the record to its original producer for methods and context. UN Statistics Division overview UNdata terms
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WHO Data and the Global Health Observatory (GHO) cover global and country-level health indicators, including mortality, immunization, health systems, and health-related Sustainable Development Goals. Many GHO datasets are estimates prepared for comparability and can differ from official national estimates. Consult the indicator’s methods and metadata; WHO’s GATHER guidance emphasizes documenting input data and estimation methods for new global estimates. WHO GHO information WHO indicator methods GATHER guidance
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7. OECD statistics
OECD statistics can support cross-country comparisons for subjects covered by OECD statistical products. Check the dataset documentation for sources, collection methods, country coverage, years, and definitions before treating values as directly comparable. OECD statistical documentation
8. Eurostat
Eurostat is a starting point for European Union statistical comparisons and topic-specific indicators. Availability and coverage depend on the dataset; confirm its metadata, country and year coverage, and definitions in the source dataset. OECD documentation identifies joint OECD/Eurostat/WHO statistical products. OECD statistical documentation
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9. UN World Statistics Pocketbook
The UN Statistics Division’s World Statistics Pocketbook offers country profiles and cross-country overviews spanning economic, social, environmental, and infrastructure topics. Its technical notes explain concepts and methods and point readers to primary sources for deeper data. Use the cited source when you need a particular series or detailed methodology. Pocketbook publication page
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10. National statistical offices
For official statistics about a country outside the United States, look for that country’s national statistical office or the agency responsible for the topic. A specialist ministry or agency may own statistics for a particular field. UNdata can help locate providers, but the source database remains the original publisher. UN Statistics Division overview UNdata terms
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How to choose the right statistics source
- Match the geography. Use a national source for a country-specific question and a well-documented international dataset when comparing countries.
- Match the topic. A specialist agency may provide more relevant definitions and detail than a broad portal.
- Identify the producer. A portal may aggregate or republish another organization’s data. Find the agency responsible for collecting or estimating the value.
- Check the measure and method. Confirm the unit, population, geographic boundaries, collection method, and whether the number is observed, estimated, modeled, or projected.
- Align time periods and revisions. Check the release or revision date and compare figures only when their definitions and reference periods align.
- Assess available detail. Look for the table, series, downloadable file, or metadata needed to answer your question and reproduce the result.
How to verify and cite a statistic
- Find the claim in a relevant official portal, then open the specific dataset, table, release, or source agency behind it.
- Record the measure’s definition, unit, population, geography, time period, and whether the value is reported or estimated.
- Check publication and revision dates, along with the version or vintage used. If comparing figures, make sure the definitions and periods match.
- Use the publisher’s recommended citation when available. Census guidance advises identifying the author or agency, title, table or file, vintage or release date, version or access date, persistent identifier where available, and URL. Census citation guidance
- If an aggregator republishes a statistic, cite the underlying producer as appropriate. UNdata says its content comes from source databases and can change as source availability changes. UNdata terms
Why figures can differ between websites
Two portals may show different values for what appears to be the same statistic because they use different definitions, reporting periods, source records, estimation methods, or revision vintages. WHO notes that many GHO values are estimates designed for comparability and may differ from official national estimates. For other indicators, check the dataset’s own methodology rather than assuming that a portal’s summary explains every difference.
When a portal points to another agency’s data, treat the portal as a route to the statistic rather than the final authority on its methodology. The original producer’s documentation is the place to resolve what the figure includes and how it was created.
Quick Recap
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