This dataset presents a detailed reconstruction of the 1808 Napoleonic land registers of Venice. It combines digitized cadastral maps, transcribed ownership records (Sommarioni), and disambiguated personal entities. The data, created through semi-automated transcription and rigorous manual standardization, offers over 20,000 parcel geometries linked to more than 12,000 individual and institutional owners. It supports spatial, legal, and social analysis of early 19th-century Venice and is openly available in JSON and GeoJSON formats.