Center for Population Biology (CPB)
This is the home page for the Natural Environment Research Council (NERC) Center for Population Biology which is a research group that is part of the Imperial College, London, England. This web site has research updates on population studies and a database of over 2000 studies of population growth over a diversity of species.
http://www.cpb.bio.ic.ac.uk

Population Reference Bureau
A great source of human population statistics such as total fertility rates, annual population growth rates, and crude birth and death rates for every country
http://www.prb.org

Consequences: The Nature and Implications of Environmental Change
An on-line journal that produced five volumes before ending publication. Full text articles can be found on topics such as hunger, climate change, land use, biodiversity, and water supply. One article is entitled; Global and U.S. National Population Trends.
http://www.gcrio.org/CONSEQUENCES/introCON.html

Centers for Disease Control and Prevention
Contains health information, data, and statistics about heath-related issues.
http://www.cdc.gov

International Planned Parenthood Federation (IPPF)
Provides access to publications about family planning and sexual and reproductive health. IPPF links national autonomous Family Planning Associations in over 150 countries worldwide.
http://www.ippf.org

National Center for Health Statistics (NCHS)
Provides access to publications and statistical tables, selected public-use data files, on-line database queries and searches. Also contains information about each NCHS survey and data system and links to other sites.
http://www.cdc.gov/nchs

National Health Information Center (NHIC)
NHIC is a health information referral service. The Health Information Resource Database includes 1,100 organizations and government offices that provide health information upon request. Entries include contact information, short abstracts, and information about publications and services the organizations provide.
http://www.health.gov/nhic

Planned Parenthood Federation of America
Provides educational resources, public affairs news, and indexed links about reproductive health and family planning services in the United States.
http://www.plannedparenthood.org

United Nations Development Programme
Information on sustainable human development and links to the UN Environment Programme and other UN sites.
http://www.undp.org

The World Bank
Provides access to publications and data about developing countries and countries in transition.
http://www.worldbank.org

World Health Organization
Information on health topics, WHO reports, and links to other United Nations Web sites.
http://www.who.int/en/

Population Connection
Formerly known as Zero Population Growth. This organization is concerned with the "clear connection between population growth and virtually every challenge facing our planet". Contains links to lists of population-related web sites.
http://www.populationconnection.org

U.S. Census Bureau
The mission of this federal agency is to be the preeminent collector and provider of timely, relevant, and quality data about the people and economy of the United States. Site includes: national, state, and international population information, population projections, census of the US economy, income and housing information, maps, and links to related sites.
http://www.census.gov