This report presents a set of preliminary national census survival rates for use in estimating net migration during the decade, 1960 to 1970, for various subgroups of the United States population, particularly geographic subdivisions. Separate figures are given for the white population, the Negro-and-other-races population, and the Negro population, by sex.

In calculating national census survival rates, an attempt is made to eliminate all migration into and out of the United States for the intercensal period, that is, to derive a “closed” population. (Such a population can only be approximated for the United States but little error is believed to result from this approximation.) The present set of rates achieves this by, excluding intercensal net civilian (alien and citizen) migration from the population including Armed Forces overseas in 1970. Specifically, these national census survival rates are based on the total resident population of the United States for 1960 and 1970, adjusted to include U.S. Armed Forces overseas and to exclude net civilian migration to the United States during the 1960–70 decade.