Data.govUnited States open government resource including datasets produced by federal as well as contributing state and local organizations. In addition to raw data downloads, site provides analytical tools and an Application Programming Interface (API) for data access. Coverage: 2013-present.
Office of the Federal RegisterProvides access to federal laws, federal regulatory material, presidential documents, and federal organizations, programs, and activities.
Science.govScience.gov is a gateway to over 50 million pages of authoritative information provided by U.S. government agencies, including research and development results. Science.gov is an interagency initiative of 17 U.S. government science organizations within 13 Federal agencies.
U.S. Census BureauU.S. Census Bureau is the principal source of periodic demographic data. The Census Bureau's current demographic statistics program provides information on the number, geographic distribution, and social and economic characteristics of the population, including official estimates of income and poverty, estimates of health insurance coverage and home ownership rates, and a quarterly indicator of housing vacancies.