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Population density (people per km 2 ) of the world Population density (people per km 2 ) by country, 2006 Population density (people per km 2 ) map of the world in 1994. In relation to the equator it is seen that the vast majority of the human population lives in the Northern Hemisphere. Population density (people per km 2 ) map of the world in 1994 Deserts around the world. Compare with maps above. See also this image for location of densely populated areas (cities) in various vegetation zones. Population density (in agriculture: standing stock and standing crop) is a measurement of population per unit area or unit volume; it is a quantity of type number density. It is frequently applied to living organisms, and most of the time to humans. It is a key geographical term. [1] Contents 1 Biological population densities 1.1 Countries and dependent territories 1.2 Other methods of measurement 2 See also 2.1 Lists of entities by population density 3 References 4 External links Biol

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Census taker visits a Romani family living in a caravan, Netherlands 1925 A census is the procedure of systematically acquiring and recording information about the members of a given population. The term is used mostly in connection with national population and housing censuses; other common censuses include agriculture, business, and traffic censuses. The United Nations defines the essential features of population and housing censuses as "individual enumeration, universality within a defined territory, simultaneity and defined periodicity", and recommends that population censuses be taken at least every 10 years. United Nations recommendations also cover census topics to be collected, official definitions, classifications and other useful information to co-ordinate international practice. [1] [2] The word is of Latin origin: during the Roman Republic, the census was a list that kept track of all adult males fit for military service. The modern census is essential to interna