Geography

CIA - The World Factbook
Provides information on the history, people, government, economy, geography, communications, transportation, military, and transnational issues for 267 world entities.

GeoPlatform
"The GeoPlatform provides shared and trusted geospatial data, services, and applications for use by the public and by government agencies and partners to meet their mission needs."

Geography and Map Reading Room, Library of Congress
"The largest and most comprehensive cartographic collection in the world." The Reading Room is open to the public and provides in-person, telephone, and written reference assistance. Check the website for hours and location.

MPI Data Hub: Migration Facts, Stats, and Maps
Access to the latest immigration statistics, maps, and numbers for the United States and other countries.

National Map U.S. Department of the Interior, U.S. Geological Survey.
An online, interactive map service that provides public access to high quality geospatial data.

PRB: Population Reference Bureau
"The Population Reference Bureau informs people around the world about population, health, and the environment, and empowers them to use that information to advance the well-being of current and future generations.

U.S. Board on Geographic Names
Search for domestic or foreign geographic names.

United Nations Map Library
"The Map Collection houses over 80,000 maps, some 3,000 atlases, gazetteers, travel guides, reference works and digital products."

World Health Organization
Provides health data by Countries.