The article attempts to analyze some features of the growth, recruitment and assimilation of the population during the thirty year period when Corby in Northamptonshire, England has changed from a village of 1,500 people to a New Town of well over 34,000 inhabitants. The features discussed include at top, the population growth. According to the 1931 Census, the population of Corby was 1,596. The war years brought a slight decline, but since 1945 growth has continued at an increasing rate, particularly since its designation as a New Town in 1950. During both the prewar and postwar periods immigration has made a more significant contribution than natural increase to the total population growth. Corby today consists of several large housing estates which have been added to the village nucleus since 1934 by successive developers -the steel firm, the Urban District Council and Development Corporation. The age of development, the pattern of mi- migration, together with differences in layout and structure, have resulted in four highly distinctive units or physical sub-regions. Thus the various quarters possess populations of different origin, age structure and proportion employed in the steelworks.