Ownership structure of the agricultural land is one of the indicators for functional and justified orientation of agricultural policy-making. Despite adequate administrative registers in Slovenia, this is not explicitly captured in a single data source. Therefore, proportion of rented utilised agricultural area was formerly estimated using statistical questionnaires. In the scope of the 2020 Agriculture Census, administrative data source modelling process was developed that will substitute survey questions. The presented work is a case of integrating geospatial and tabular administrative data sources and a step towards a more complete exploitation of readily available data.