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Size and structure of the population

The United Nations Statistics Division is the primary agency responsible at the international level for collecting official national statistics related to population size and structure. These have been collected and disseminated on an annual basis through the Demographic Yearbook system since 1948.

The United Nations Population Division prepares United Nations estimates and projections of the population showing its size as well as structure by age and sex for countries and areas of the world. These estimates and projections are based on national data provided by the United Nations Statistics Division. The latest estimates and projections of population size are published in the World Population Prospects.

 
United Nations Statistics Division - Demographic and Social Statistics