The article is devoted to developing an electronic demographic (e-demographic) system based on a single state registry for conducting a demographic research. In the digital age, new data sources for the study of demographic behavior are emerging. Currently, population registry data used for the study of population is still quite limited.Therefore, the creation of the e-demographic system based on a single state registry for effective demographic research, as well as for the analysis of not only the population registry, but also other state registries, is of great relevance. The article examines the international experience of using the demographic characteristics of the data accumulated in the population registry. The practice shows that although population registry data are currently used in population studies, there are no approaches to the use of data from other state registries and to the development of an e-demographic system. The article proposes the concept of forming an e-demographic system based on a single state registry which operates independently of the functions of the e-government. The article outlines the benefi ts of using Big Data, OLAP, ETL technologies to analyze the demographic data. The development of the system allows better understanding the demographic processes and enables in-depth research at different levels from social demography to population geography and from migration processes to medical demography.