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Washington Master Addressing Services (WAMAS)

Locating people and places in Washington


The population of the State of Washington is growing, corresponding with increased addresses. Compounding address-related errors can have significant and costly effects on government operations.

GeoPortal Technical Resources

Provided here are more technical details about the GeoPortals infrastructure, operations and  governance. 

Accessing WAMAS Services

Provided here are the documents you'll need to submit to gain access to the WAMAS application programming interfaces (API's).  These services are open to any and all governmental entities.

You will need to complete all three (3) documents in order to access these authoritative services.