Lagos
Demography

Although the 2006 National Population Census of Nigeria credited the metropolitan area with a population figure of 7,937,932, the figure is at variance with some projections by the United Nations and other population agencies and groups worldwide. The population figure of Lagos State given by the Lagos State Government is 17,553,924. That figure was based on claimed conducted enumeration for social planning by the Lagos State Government's "parallel census" and it believes that since the inhabitants of the metropolitan area of Lagos constitute 88% of the Lagos State population, the population of metropolitan Lagos is about 15.5 million.

A rejoinder to Lagos State Government views concluded that Lagos State concealed the fact that the population projection, for Lagos Urban Agglomeration by the UN agencies, had been revised downwards substantially as early as 2003. It failed to interpret the two most important and fairly representative and reliable secondary data sets already in the public domain, the National Identity Card Scheme and the 2003 Voters Registration figures from INEC. The figures for 2007 Voters Registration by INEC were an act subsequent to the release of the provisional census results and comprehensively corroborate, vindicate and validate the population figures.According to the official results of the 2006 census, there were 8,048,430 inhabitants in Metropolitan Lagos. This figure was lower than anticipated and has created controversy in Nigeria. Lagos Island, the central Local Government Area and historic center of Metropolitan Lagos, had a population of 212,700 at the 2006 Census.

Authorities of Lagos State have disputed the results of the 2006 census, accusing the Nigerian National Population Commission of undercounting the population of the state. This accusation is denied by the National Population Commission. A study found that research carried out by Africapolis (the African subsidiary of e-Geopolis backed by the Agence française de développement), in addition to the cross-referencing of official figures with more scientific independent research concluded that the 2006 census figures for Lagos State of about 9 million were valid and that the state's own assessments are inflated.

Lagos is, by most estimates, one of the fastest-growing cities in the world. Lagos is experiencing a population increase of about 275,000 persons per annum. In 1999, the United Nations predicted that the city's metropolitan area, which had only about 290,000 inhabitants in 1950, would exceed 20 million by 2010 and thus become one of the ten most populated cities in the world.
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