The book "Census of the Population as a Source for the Study of the Demography of Kazakhstan" offers a comprehensive analysis of the censuses from the late 19th to the first half of the 20th century. It examines the censuses as historical sources and evaluates their informational content, reliability, and representativeness for the study of Kazakhstan's demographic history. The monograph is aimed at historians, source researchers, and demographers, as well as a broader audience interested in the topics of historical demography. Through a detailed examination of the censuses, it enables a deeper understanding of demographic developments in Kazakhstan, which is of great significance for research in this field.