EN
This article aims at analysing the population of Roman Catholics in 1775–1914 in Grudziądz in respect of the number of marriages, baptisms and deaths. During the analysis of the data the author noticed certain similarities. Both the numbers of marriages and births as well as of deaths decline from the beginning of the analysed period up to the second decade of the 19th century. Perhaps such a tendency can be associated with the Germanization policy implemented by the Prussian authorities since the very beginning of the partition period. Moreover, a proportion of the faithful could emigrate to the territories that belonged to the First Polish Republic yet. Starting from the 20s ofthe 19th century, we notice an opposite trend. The elements of the natural population dynamics that were analysed were increasing until the end of the selected period, with small exceptions. There is no doubt that it was the economic development of Grudziądz, especially visible in the second half of the 19th c. and the first decades of the 20th c., that contributed to it. Also migration processes should be also taken into account. At the turn of the 19th and 20th centuries there was a rapid population growth in Grudziądz. The majority of those people arrived to find a work and begin a dignified life. Probably the young people accounted for the lion’s share, which contributed to the increased population reproduction. Such a dynamic growth in the number of people in the mentioned period indicates that there was also some medical progress and that the first symptoms of demographic changes might be observed, as it is shown by the b/d rate.