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Démografi mercayakeun kana ngagunakeun data baréa-réa, kaasup sénsus kalahiran, pernikahan jeung tilar dunya. The éarliest modérn census was carried out in Britain in 1801. See also demographic statistics.

In many countries, particularly in the third world, reliable demographic data are still difficult to obtain. For example, during the 1980s the population of Nigeria was widely estimated to be around 110 million, before it was established to be as little as 89 million (without adjustment for undercounting) in a census carried out in 1991.