Dear Ms. Schipp,
Thank you for posting your request on History Hub!
The National Archives microfilmed 427 bound volumes from approximately 231 record series relating to Confederate prisoners of war confined by Federal authorities and published them as Selected Records of the War Department Relating to Confederate Prisoners of War, 1861-1865; (National Archives Microfilm Publication M598, 145 rolls); War Department Collection of Confederate Records, Record Group 109. Despite what the name implies, Record Group 109 includes many Union records relating to Confederates and not just records of Confederates. This publication contains prisoner registers for several Federal camps in Ohio, including Camp Chase, Johnson's Island, Cincinnati, McLean Barracks (Cincinnati), Camp Dennison, and the Department of the Ohio. See the descriptive pamphlet here for more information. For questions about these records, please contact the National Archives at Washington, DC - Textual Reference (RDT1) at Archives1reference@nara.gov.
M598 is available for viewing in the research rooms of the National Archives in Washington, DC; National Archives at Atlanta, GA; National Archives at Chicago, IL; National Archives at Denver, CO; National Archives at Boston (Waltham, MA); and National Archives at Kansas City, MO. WorldCat lists 12 libraries with copies of the microfilm. There may be additional institutions with copies which have not listed their holdings on WorldCat.
M598 also has been digitized and can be accessed online through Ancestry as U.S., Civil War Prisoner of War Records, 1861-1865; and on FamilySearch as United States Records of Confederate Prisoners of War, 1861-1865. There may be a fee for accessing the records on Ancestry. Some libraries provide free access to their patrons. FamilySearch may be accessed with a free account. Plus, copies are linked at The American History and Genealogy Project.
We also located Papers Relating to Citizens, 1861 - 1867 in Record Group 109 that contains records of Union Provost Marshals relating to various types of civilians. Portions of this series have been digitized and can be viewed online using the Catalog. Plus, the series is available as microfilm publications M345 Union Provost Marshal's File of Papers Relating to Individual Civilians and M416 Union Provost Marshal's File of Papers Relating to Two or More Civilians. Descriptive pamphlets are available for M345 and M416.
M345 is available at the National Archives in Washington, DC; National Archives at Atlanta, GA; and National Archives at Denver. M416 is available at the National Archives in Washington, DC; National Archives at Denver, CO; National Archives at Kansas City, MO; and National Archives at Seattle, WA. WorldCat also has listings for M345 and M416.
M345 has been digitized and is available from FamilySearch as United States Union Provost Marshal Files of Individual Civilians, 1861-1866 and on Fold3 as Union Citizens File. M416 is available on FamilySearch as United States Union Provost Marshal Files of Two or More Civilians, 1861-1866.
In addition to the microfilmed and digitized records in Record Group 109, there may be relevant records in Records of the Commissary General of Prisoners, 1861 - 1905 (Record Group 204). Please contact RDT1 for more information about these records.
All NARA locations are currently closed to researchers due to COVID-19. Also, due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT1. We apologize for this inconvenience and appreciate your understanding and patience. Please see https://www.archives.gov/coronavirus for the most
current information about NARA’s response to COVID-19.
We hope this is helpful. Best of luck with your family research!