GIS Open Data

A variety of Assessor's Office data is available in electronic format for download from the Snohomish County Open Data Portal. Snohomish County has made every effort to make the data freely and readily accessible. Due to the variety of user system configurations and security software, the Assessor's Office is not able to provide technical assistance if you are unable to download the data.

Spatial Data (GIS)

Snohomish County has a distributed GIS environment with GIS work groups located in Public Works, Planning and Development Services, Emergency Management, Information Technology, and the Assessor's Office, among others. 

The Assessor is the custodian of a variety of spatial data layers, some of the more popular layers that are available on the open data portal are:

Tabular Data

Selected extracts from our tabular data systems are available for free download.

Unrecorded Plats

A zip file containing a collection of PDF scans of unrecorded plats.

The Assessor's Office will continue to enhance its data offerings in the future.