In 2011, as part of a film project for History Television commemorating the bicentennial anniversary of the War of 1812, ASI conducted an archaeological investigation at Fort York’s central parade ground to determine the location of the Government House. This work included a historic map review, LIDAR survey, Ground Penetrating Radar (GPR) survey, and archaeological excavations. In addition to the Government House, several other early nineteenth-century historical structures previously occupied the survey area. This paper explains the use of Geographic Information Systems (GIS) in the interpretation of the various datasets acquired compared to the mapped historical record of Fort York. The results show the applicability of GIS as a tool to assist in the organization, visualization, and interpretation of archaeological excavation and remote sensing data.