These records include the index to Naturalization Petitions and Records filed at the King County Superior Court from 1906 to 1920 that were transferred by the National Archives and Records Administration – Pacific Alaska Region (Seattle) to the Washington State Archives Puget Sound Branch in 2003. The index will give information about the applicant and what documents are included in the files.

For the best search results, search by name. Search by either last name, first and last name, or just the first letter of the last name. The document year is the date of entry into the United States.

Learn about the documentation of Naturalization in Washington and what information is found in the various record types by selecting the tab that says "About this Collection" here