United Nations Population Division - The Population Division is responsible for monitoring and appraisal of the broad range of areas in the field of population.

United Nations Population Fund - UNFPA is an international development agency that promotes the right of every woman, man and child to enjoy a life of health and equal opportunity. UNFPA supports countries in using population data for policies and programmes to reduce poverty and to ensure that every pregnancy is wanted, every birth is safe, every young person is free of HIV, and every girl and woman is treated with dignity and respect.

• World Population Prospects: Population Database - United Nations Population Division (UNPD)
  Official UN estimates (1950-2006) and projections (2006-2050) for every country in the world, including estimates and projections of 28 demographic indicators, including birth rates, deaths rates, infant mortality rates and life expectancy.

• City Population 
  Population overview for the major cities and agglomerations of the world.

• GeoHive
  Geopolitical data and population statistics of official regions, countries, provinces and cities; statistics on wealth and infrastructure are also given.

• State of the World's Population - United Nations Population Fund (UNFPA)
  Each  year the UNFPA produces a report on a topic related to issues around population.
  Latest print edition in Gov Info Ref 304.6021 S797

• United Nations Population Information Network
  Guide to population information on UN system websites.