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Dear Mr. Driscoll,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 19 series pertaining to the McNeil Island Federal Penitentiary in the Records of the Bureau of Prisons (Record Group 129). Five series include inmate information: Index to Prisoners, 1893-1908; Records of Prisoners Received, 1875-1951 (also available on microfilm as National Archives Publication M1619); Prisoner Identification Photographs, 1875-1923; Inmate Index Cards, 1930-1981; and Prisoner Case Files, 1875-1920. For access to these records, please contact the National Archives at Seattle (RW-SE) via email at firstname.lastname@example.org.
For information regarding records produced or discontinued by the Bureau of Prisons, please contact the Bureau of Prisons Records Manager, Lindsey George, 400 First Street, NW - Room 6009, Washington, DC 20534 or via email at LEIza@bop.gov.
We hope this is helpful. Best of luck with your research!