This study examines the religious composition of the population on so-called state estates, which included estates administered by an official body, but also by the Religious, Study and Endowment Fund, or Charles-Ferdinand University. The research is based on a survey event that took place on the estates in 1802 and covered a broad range of themes. For the purposes of this study only questions on religious topics were selected. For supplementary information and as a comparative source a topographical-statistical handbook compiled by J. G. Sommer in the second quarter of the 19th century was used. Analyses of the questionnaires revealed that a majority Catholic population lived on the estate. This was particularly typical of traditionally Catholic western Bohemia. Conversely, the Protestant tradition was confirmed in the eastern Bohemian estates, especially Poděbrady and Pardubice, and also the estates of Větrný Jeníkov and Středokluky. While on the estates of Pardubice and Větrný Jenikov Protestants were concentrated in particular, more or less segregated areas, in Poděbrady the co-existence of Catholics and Helvetians was quite common. In 1802 Helvetians made up almost one-third of the local population here, and a study of the registries of Poděbrady parishes shows that weddings between people of different faiths were quite frequent, constituting approximately one-quarter of all marital unions. Mixed marriages had of course a negative impact on the proportion of Protestants in the population, as the majority of children born into these families were raised as Catholics. With regard to the Jewish population, unlike the Protestants there were Jews living in most of the state estates, but the proportion of the population they represented was much lower, around less than 1%, and it was more a matter of individual families.