The Agency for Healthcare Research and Quality (AHRQ) provides a range of data resources on topics such as the use of health care, the costs of care, trends in hospital care, health insurance coverage, out-of-pocket spending, and patient satisfaction.

Excellent source for publications, statistical tables, news releases, and fact sheets on popular health topics. Also includes links to other health-related tools and resources.

This site uses Medicare data to provide information and analysis about national, regional, and local markets, as well as hospitals and their affiliated physicians to document variations in how medical resources are distributed and used in the United States.

The Demographic and Health Surveys (DHS) Program has collected, analyzed, and disseminated accurate and representative data on population, health, HIV, and nutrition through more than 300 surveys in over 90 countries.

The Health System Measurement Project tracks government data on critical U.S. health system indicators. The website presents national trend data as well as detailed views broken out by population characteristics such as age, sex, income level, and insurance coverage status.

Established in 1988 as a national resource for molecular biology information, NCBI creates public databases, conducts research in computational biology, develops software tools for analyzing genome data, and disseminates biomedical information - all for the better understanding of molecular processes affecting human health and disease.

The information on these statistics pages includes the best statistics currently available on the prevalence, treatment, and costs of mental disorders for the population of the United States, in addition to information about possible consequences of mental illnesses, such as suicide and disability.

The National Neighborhood Data Archive (NaNDA) is a publicly available data archive containing measures of the physical, economic, demographic, and social environment at multiple levels of spatial scale (eg, census tract, ZIP code tabulation area, county). Each NaNDA dataset covers all or most of the entire nation (including both rural and urban areas) and represents a set of measures on a single topic of interest, including socioeconomic disadvantage, healthcare, housing, partisanship, and public transit, with temporal coverage dating back to 2000.

Contains aggregated and microdata about behavioral health issues.

WHO's portal providing access to data and analyses for monitoring the global health situation

The U.S. Energy Information Administration (EIA) collects, analyzes, and disseminates independent and impartial energy information to promote sound policymaking, efficient markets, and public understanding of energy and its interaction with the economy and the environment.

Envirofacts provides a single point of access to select U.S. EPA environmental data.

Searchable source of data sets and services covering a broad range of topics, including agriculture, atmosphere, biosphere, climate indicators, cryosphere, land surface, oceans, paleoclimate, and more.

NOAA's National Climatic Data Center (NCDC) is responsible for preserving, monitoring, assessing, and providing public access to the Nation's treasure of climate and historical weather data and information.

This site provides access to water-resources data collected at approximately 1.5 million sites in all 50 States, the District of Columbia, Puerto Rico, the Virgin Islands, Guam, American Samoa and the Commonwealth of the Northern Mariana Islands.

The Renewable Resource Data Center (RReDC) provides access to an extensive collection of renewable energy resource data, maps, and tools. Biomass, geothermal, solar, and wind resource data for locations throughout the United States can be found through the RReDC.

Research and statistics from the USDA including Agricultural Research Service (ARS), National Agricultural Statistics Service (NASS), and Economic Research Service (ERS).