This article describes the construction and content of an atlas of local jurisdictions of Ancien Régime France: bailliages. Bailliages were at the center of the Ancien Régime's jurisdictional apparatus: they administered the ordinary royal justice, delimited the area of influence of different customary laws, and served as electoral constituencies for the Estates General of 1614 and 1789. Based on Armand Brette's Atlas des Bailliages et Juridictions Assimilées published in 1904, we develop a historical geographic information system that contains shapefiles and associated data files of bailliage courts at the time of the convocation of the Estates General of 1789.