Provides detailed profiles of all of the countries of the world. Offers information on each country's geography, people, government, economy, communications, military, and transnational issues, as well as maps and flag images. Covers 2000 - present in PDF; current interactive edition is continually updated.

Monitors the quality of the air; the quality of drinking, surface and ground water; ecosystem status; and the introduction of toxic or hazardous substances into the environment. Conducts research and studies to provide baseline data and to evaluate and support environmental monitoring systems.

Retrieve EPA data on waste, water, toxics, air, land, radiation, and compliance. Information can also be accessed by zip code, or city/county/state abbreviation.

Gathers worldwide environmental data about the ocean, earth, air, space, and sun and their interactions to describe and predict the state of the physical environment. NOAA also maintains a national environmental data base, in which the agency's data are combined with selected environmental information collected by other agencies in support of their respective missions.

This is a compendium and guide to statistics on just about everything in the United States.  Among the several appendixes is a list of state statistical abstracts.

Provides information on the size and distribution of our population.

Through its Water Resources Division, collects and maintains data on the quality, availability and use of the Nation's water, including streamflow data for hydropower plants, groundwater subsistence, erosion, backwater, flooding, water contamination, and sedimentation.