This book analyzes the distribution of the urban population in an industrialized country. The USA was chosen as the object of the study because it had, at the time of writing, in 1956, the largest population for which homogeneous and comparable statistics were available. The first step in the quantitative analysis of population distribution, according to the method suggested here, is the breaking up of the total population into its components: the industries in which people earn their living. Extensive maps support the text as it discusses the problem of industrial location which has attracted much attention from geographers and economists.