From the Washington State Archives Site: Search for your ancestors in our collection of Washington Census and Naturalization Records at the Digital Archives.
Available for your research are over 3.7 million records, including:
Adding records on-line is an on-going process. If you don't find what you are looking for, check back later, as it may have been added.
Many marriage records have been digitized. Many death records seem merely to be taken from the SSDI.