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Washington Master Addressing Services (WAMAS)


Locating people and places in Washington

A history of inconsistent results in locating addresses in Washington has resulted in bad press and even legal action over the last decade.

These service API's can be consumed from within a web browser, a mainframe, desktop or server application.

The suite of services include tools that:

  • Correct an address to USPS standard format;
  • Add coordinates to an address so it can be displayed and viewed on a map; and
  • Locate an address in the correct geographic area like county, voting and taxing districts and many other important boundary jurisdictions.
Need more information... then take a look at these associated sub-pages, the GIT subcommittee page or send an email to