Department of Homeland Security Classified Facility Inventory Act (Sec. 2) This bill requires the Department of Homeland Security (DHS) to: (1) maintain an inventory of DHS facilities that DHS certifies to house classified infrastructure or systems at the secret level and above; (2) update such inventory on a regular basis; and (3) share part or all of such inventory with DHS personnel who have been granted the appropriate security clearance, non-federal governmental personnel who have been granted a Top Secret security clearance, and other personnel as deemed appropriate by DHS. The inventory may include the location, attributes, operating entities, and date of establishment of such facilities.