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Dear Ms. O’Donnell,
Thank you for posting your request on History Hub!
Since his naturalization occurred prior to 1906, it could have occurred at any court of record (ex. Federal court, county court, etc). We suggest that you begin your search by contacting the National Archives at Chicago and requesting a search within the naturalization records from the Cincinnati Federal court. If their staff are unable to locate any matches, you will need to consider searching the records of lower courts in the Cincinnati area.
Unfortunately, an 1884 fire at the Hamilton County courthouse destroyed a number of records. The Hamilton County Genealogical Society posted search instructions for various online indexes and the University of Cincinnati has a collection of original and restored naturalization records. Please note that early naturalization records normally contain very few biographical details such as the town and/or parish where the individual lived or was born. Alternate sources of family information include marriage and/or death records.
The Ireland’s Department of Culture, Heritage, and the Gaeltacht officially supports a website dedicated to Irish genealogical research and has a variety of church and civil records available for online use.
We hope this information is helpful. Best of luck with your family research!
[Information provided by Elizabeth Burnes, Subject Matter Expert]
Thank you Rebecca.