With more than 245,000,000 inhabitants the US is the fourth country in the world in terms of population. About 75% of the population live in urban areas and there are 170 cities of more than 100,000 inhabitants, 24 of which have populations of over 500,000. Most of these urban centres lia along the Atlantic and Pacific coasts, thr Gulf of Mexico and the Great Lakes. The most populous area is the relatively small Northeast, which accounts for nearly one fourth of the nation's population.In 1990 the US Bureau of Census conducted a new census of the American people which showed that some important demographic changes were taking place.
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