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Dear Mr. Harteis,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 6 series pertaining to aliens in the Records of the Immigration and Naturalization Service (Record Group 85) for the Philadelphia District that may include records from Maryland and Virginia during WWI. Please review these series and contact the National Archives at Philadelphia (RE-PA) via email at firstname.lastname@example.org for more information.
Unfortunately, the vast majority of these enemy alien records no longer exist. The series from Kansas is by far the most comprehensive that NARA has. There are smaller series of records at other NARA facilities (ex. Riverside has some from the Phoenix, AZ area, and Atlanta has series covering parts of eastern North Carolina). Smaller groupings of records may be located at local and state archives and/or historical societies.
We hope this is helpful. Best of luck with your research!
[Some information provide by Elizabeth Burnes, Subject Matter Expert]