Could you please clarify your question?
Registration for what? What time period?
Thanks, Jason. Sorry my question was incomplete. German-Americans over the age of 14 in the U.S. during WW I were required by law to register as alien enemies. They registered at post offices and police stations. Registrations were also called affidavits. Registrations were from 1917 to 1918. I'm looking for Missouri alien enemy registrations from Cole County where my grandfather Leo Groner and his father Benedict Groner and their families lived during WW I.
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The following is everything I can find in the National Archives Catalog on enemy aliens for the 1910s.
According to Family Tree Magazine, "These registration forms provide a genealogical goldmine of information... Unfortunately, many of these records no longer exist. Those that do are scattered between the regional branches of the National Archives. Records for enemy alien residents of Kansas, North Dakota, Minnesota, eastern North Carolina, Phoenix, San Francisco, Shreveport, Allen County (Indiana), and Frankfort (Kentucky) are all known to exist, and there are likely more to be found."
Neither the Catalog nor the magazine article mention registration forms for Missouri being available. It is likely that the courts and police stations for these areas disposed of the records when the war was done. On the off chance that there anything for Missouri in National Archives custody for Missouri that is not yet listed in the Catalog, it would probably be in the National Archives at St. Louis.
However, according to A Beginner's Guide to Online Genealogy: Learn How to Trace Your Family, "The majority of World War I enemy alien records were destroyed in the 1920s by authority of Congress, but state and/or local copies of records for Kansas, Minnesota, Missouri, and the Phoenix, Arizona area... still survive."
Unfortunately the pages available for preview on Google Books don't say where any Missouri records might be found, and I can find no verification elsewhere.
My advice is to contact the following state level organizations.