A Picture of the Distribution of Population in Pennsylvania

THE accompanying map, Figure I, portrays the distribution of population in Pennsylvania by the method.1 Irregular symbols are used for the larger cities, those having 50,000 population or more.2 The census of 1920 returned 13 places with such a population, the largest, Philadelphia, having 1,823,779 inhabitants. The cities and boroughs having a population of under 50,000 were divided into three groups, and the area of the circles was apportioned to the total population as represented by these groups: places of from 25,000 to 50,000 population, of which there were 7; Io,ooo to 25,000 population, of which there were 57; and 2500 to Io,000 population, of which there were 237. For the remaining population of the state, i. e. the population of incorporated places under 2500 and the unincorporated segregated population, as well as the rural population, a unit of 200 population was used, with the size of the dot in proportion to the circles used for the larger cities

Distribution (mathematics · Geography · Population · Sociology · Census and Population Estimation · Demography · Mathematics

• The construction and interpretation of statistical maps

  Catherine D J Back•Australian Geographer•1933

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