Abstract: The object of this research is the peculiarities of demographic development of urban population of Southern Siberia over the period from 1945 to 2017. The subject of this research is the marriage and divorce rates as the paramount demographic processes. The territorial framework consists of the republics of Khakassia, Tyva and Altai. The author examines such aspects of the topic as factors that influence these processes and trends of their development, as well as assessment of the regional differences with regards to marriage and divorce among urban population. The analysis is conducted on the absolute number of marriages and divorces. Correlation between the amount of divorces and amount of marriages, total rates of marriage and divorce, matrimonial structure of urban population in accordance with the four All-Union and two All-Russian censuses. The scientific novelty consists in performing systemic analysis of the dynamics of marriage and divorce rates among urban population of Southern Siberia throughout a historical period of more than 70 years. The drawn conclusions demonstrate that the development of such demographic processes as marriage and divorce rates to a great extent are substantiated by the structural factors. The author also notes that considerable differences with regards to these demographic processes are observed between the representatives of various ethnic groups.