This volume has been designed to show, in particular, the smallest areas for which the data on each subject have been tabulated, and the greatest detail in which each classification has been made for any area. In the published reports, the tabulated data have been consolidated, first by combining the smaller areas into larger ones for the detailed classifications, and second by combining or condensing the classifications for the smaller areas.

It outlines all of the tabulations which have been made of the information collected in the 1930 Census of Population and Unemployment and the 1931 Special Census of Unemployment, and covers, therefore, both the statistics which have been published in the 1930 Population and Unemployment census volumes and the tabulated population and unemployment data which are unpublished.