Geographic Information System (GIS)/9-1-1 Addressing: Hays County has joined with the Capital Area Council of Governments (CAPCOG) to build and maintain a GIS data repository and state-of-the-art 9-1-1 emergency response system. The GIS uses aerial photography and road/address information to assist dispatchers and emergency personnel responding to 9-1-1 calls. Maps and GIS Data are available here. If you have questions about maps or data, please email maps@co.hays.tx.usGIS also assigns 9-1-1 addresses for most of Hays County. To purchase a 12”x6” blue-and-white reflective address sign for your home or business, or for more information about GIS services, contact the GIS staff at PO Box 1006, San Marcos, TX 78666-1006, phone 512-393-2160, addressing@co.hays.tx.us