This article presents a comprehensive description of the «Cohort fertility database for regions of Russia and countries». The database provides a unique set of demographic indicators characterizing the fertility of female cohort born between 1935 and 2050. The primary objective of this dataset is to enable detailed analysis of long-term fertility trends at both the global level and the sub-national level within the Russian Federation.

The database covers 278 countries and dependent territories based on data from the International Institute for Applied Systems Analysis (IIASA-2025). A significant portion of the database focuses on 83 regions of the Russian Federation. For these regions, the database includes completed cohort fertility rates for annual cohorts (1935–2000) and five-year cohorts (1935–2050). The dataset contains indicators such as the mean age at birth, parity progression ratios, and the distribution of women by the number of children born. The calculation methodology integrates historical census data, vital statistics provided by Rosstat, and the latest projection models (SSP-2) from IIASA. This database serves as a valuable resource for demographers, sociologists, and policymakers interested in the spatial heterogeneity of the demographic transition and the reproductive behavior of birth cohort.