Abstract: This article considers some aspects related to a database covering migrants from the Russian Federation and the Belorussian Republic to Kaliningradskaya Oblast. The topicality of the study is the poor knowledge bulk related to statistics of such a large-scale migration process initiated by the Soviet Union in the middle of the 20th century which played an important role in the new region formation. It is the first time when an information resource is created that contains data from a large complex of nominative records made along the way with the mass resettlement of new residents of the region by means of train echelons. Besides the description of the source, the most typical types of its documents (echelon lists, acts on arrival and consolidated lists) are considered in detail. The authors discuss the principles to build the database and substantiate the choice in favor of the source-oriented approach. The describe the conceptual structure of the database with reference to some specific features of its logical model and the organization of the graphical user interface. The article describes how a large group of students added limited access data to the database. A preliminary analysis of the database information shows that in 1946 about 2/5 of the arriving people were unable to work (primarily due to their age). The same share, however among the heads of families, was characteristic of single people without a spouse. The absolute majority of household heads were men.