The article presents an inventory of the pre-Narew estates of the Płock bishopric, drawn up after Bishop Michał Jerzy Poniatowski was transferred to the Archbishopric of Gniezno archbishopric in 1785, and after Bishop Krzysztof Szembek, Bishop Poniatowski's former coadjutor, took over the diocese. The presented inventory gives a good insight into the production capacity and condition of the peasant farms in the estates of the bishops of Płock in the pre-Narew region.