Between 1850 and 1974 the U. S. government kept records of declarations of intention and petitions for naturalization in Washington Territory and State. These records can contain genealogically significant information. The records are organized by surname and declaration date and petition date. Some records in this group may not exist due to destruction or they may simply be missing. Additionally, the earlier records may not be indexed at all.
Microfilm copies of these records are kept at the NARA Pacific Alaska Region facility in Seattle, Washington.
The National Archives and Records Administration has fact sheets about these publications:
- M1541 — Naturalization Records of the U.S. District Court for the Eastern District of Washington, 1890–1972
- M1542 — Naturalization Records of the U.S. District Court for the Western District of Washington, 1890–1957
- M1543 — Naturalization Records of the Superior Courts for King, Pierce, Thurston, and Snohomish Counties, Washington, 1850–1974