Maps, Plats and Atlases

Sanborn Fire Insurance Maps


Sanborn Fire Insurance Maps of Snohomish County show the footprints of commercial buildings and houses and indicate building materials. Sanborns can be used to determine if a building on your property is "pre-existing" or "non-conforming" because they predate the 1955 County cutoff. This information may be helpful during the permit process if you want to remodel or rebuild an older garage or outbuilding.

The Everett Public Library has physical and digital color copies of the 1914 and 1955 Everett Sanborn maps. The library also has microfilm copies of all Sanborns issued for Arlington, Edmonds, Everett, Gold Bar, Granite Falls, Index, Marysville, Monroe, Mukilteo, Silvana, Snohomish, Stanwood, Startup and Sultan.

The King County Library System and the Seattle Public Library also provide online versions of the Sanborn maps for cardholders. (Everett Public Library cardholders are eligible for cards at both library systems.)

Northwest History Room


The Northwest History Room also keeps historic editions of the Kroll and Metzger plat books, and the 1910 Anderson Map Company Plat Book of Snohomish County. These are most helpful for areas outside of Everett. Details include property owners' names and, in the Andersons, may show building details.

The Snohomish County Courthouse Assessor's and Auditor's offices also have copies of these maps. Original Plats showing property lines, dates, neighborhoods and property owners can be found through the Snohomish County Auditor's office.