Cartographic system / non-ranked reference
Sanborn Map Key
The legend converts urban fabric into categories designed for insurance assessment.
Summary
Colour code · abbreviation · measured footprint. This page connects visible form to an institutional record without reproducing protected object imagery.
Form and material
Keys and symbols are part of the document’s argument, not secondary decoration. They define what the sheet can say.
What remains uncertain
Coverage and revision vary. An absence on one sheet should not be treated as complete historical proof.
Official or institutional sources
- Library of Congress — Fire Insurance Maps resource guide ↗
- Library of Congress — About the Sanborn Maps collection ↗
Image credit: No third-party image used. Profile artwork is CSS-only and non-representational.
Reading the reference responsibly
This page discusses public-facing characteristics and cited institutional records. It does not reproduce protected art, reconstruct lost context or imply endorsement by the maker, originating community, artist, estate or holding institution.