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The use of these symbols on fire insurance maps, especially those done by the Sanborn Map Company, was prescribed by company manuals and can usually be interpreted with a considerable degree of confidence.
There is a Sanborn Symbols Key on the first page (title page) of every Sanborn Volume. The key to symbols shows the colors and symbols used on the maps in volume. A lot of the symbols are common to most of the editions, but you still want to look at the key to your volume for any differences unique to your volume.
THE SANBORN MAP (1953 edition) In recent years Sanborn Maps have been usefully employed in many fields in addition to the fire insurance industry. They render a broad and valuable service to governmental and business organizations concerned with the physical make-up and development of cities and towns.
Sanborn Keys, Legends, and Symbol Sheets. Fire insurance maps are distinctive because of the sophisticated set of symbols that allows complex information to be conveyed clearly.
The Sanborn map collection consists of a uniform series of large-scale maps, dating from 1867 to the present and depicting the commercial, industrial, and residential sections of some twelve thousand cities and towns in the United States, Canada, and Mexico.
Glossary of Abbreviations and Obscure Terminology in Sanborn Fire Insurance Atlases Compiled by the California State University, Northridge (CSUN) Map Library Abbreviation Meaning
Sanborn maps use a shorthand of colors and symbols to represent a wealth of information. Although many Sanborn maps were hand-drawn and colored, they all use a standard scheme related in keys found in every map folio.
High definition, color and gray-scale images display important historical details not visible on black and white map scans. Includes map research tools and search tips to make finding maps for a specific location.
This PDF guide, produced by Environmental Resources Incorporated, includes a comprehensive list of all Sanborn map abbreviations and symbols. It is a great quick-view resource for researchers of all levels.
November 8, 2024. 1905 Sanborn insurance map of San Francisco whose edges were damaged by the fires that arose in the wake of the 1906 earthquake. / Courtesy David Rumsey Map Collection, Public Domain. Created for U.S. insurance firms during a period of devastating fires across the 19th and 20th centuries, the Sanborn maps blaze with detail.