Welcome to the St. Tammany Parish Assessor's Office geographic information system (GIS). Assessor Louis Fitzmorris is pleased to provide this valuable data to all parish taxing bodies and to the public. Creating this data and maintaining it for the citizens of St. Tammany is important work and benefits all in our parish. Our progress is updated here regularly as we continue to add more parcels and further our advancements in our GIS.