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King County

API Developer Portal

This portal is available to developers employed by King County, partners, and developers in the broader community who might use our data to build innovative and impactful applications. The APIs currently available in this service catalog are primarily for use by internal developers and authorized partners.

Once you log in, you can view King County’s APIs and digital products. Community members must request subscriptions to specific products to see the documentation for the APIs in those products.

Please also check the following catalogs for resources you can use:

King County GIS Open Data - https://gis-kingcounty.opendata.arcgis.com/

King County Open Data - https://data.kingcounty.gov/