The main purpose of this report is to carry forward the major migration series analyzed in Population Redistribution and Economic Growth, and to summarize developments in 1950-1960. In the process, considerable emphasis is placed upon comparisons between 1950-1960 and 1940-1950. Because the historica1 data exclude Hawaii and Alaska, much of the discussion deals with conterminous United States rather than with the total United States as now constituted. In addition, estimates derived by other methods are compared with those based on census survival ratios, and some attempt is made to evaluate the merits of each and to integrate the findings.