The size of its population is one of Nigeria's most significant and distinctive features. With probably more than 100 million people in 1990--the precise figure is uncertain because there has been no accepted census since 1963, although a census was scheduled for the fall of 1991--Nigeria's population is about twice the size of that of the next largest country in Africa, Egypt, which had an estimated mid-1989 population of 52 million. Nigeria represents about 20 percent of the total population of sub-Saharan Africa. The population is unevenly distributed, however; a large percentage of the total number live within several hundred kilometers of the coast but population is also dense along the northern river basin areas such as Kano and Sokoto. Population densities, especially in the southwest near Lagos and the rich agricultural regions around Enugu and Owerri, exceed 400 inhabitants per kilometer. None of the neighboring states of West or Central Africa approaches the total level of Nigerian population or the densities found in the areas of greatest concentration in Nigeria. Several of Nigeria's twenty-one states have more people than a number of other countries in West Africa, and some of the Igbo areas of the southeast have the highest rural densities in sub-Saharan Africa. In contrast, other areas of Nigeria are sparsely populated and have apparently remained so for a considerable time. This pattern of population distribution has major implications for the country's development and has had great impact on the nation's postindependence history.
Migration from rural to urban areas has accelerated in recent decades. Estimates of urban dwellers reveal this shift--in 1952, 11 percent of the total population was classified as urban; in 1985, 28 percent. One-sixth of the urban population, or approximately 6 million people, lived in Lagos, and in 1985 eight other cities had populations of more than 500,000.
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