Digital Sanborn Maps 1867-1970 This link opens in a new windowEl Paso Coverage 1883-1950s. Sanborn maps are large-scale plans of a city or town, drawn at a scale of 50 feet to an inch. They were created to assist fire insurance companies as they assessed the risk associated with insuring a particular property. The maps list street blocks and building numbers including numbers in use at the time the map was made and previous numbers.
