- Cincinnati - see Hamilton County below
- Cleveland Area: Ohio Naturalization Petition and Record Books, 1907-1946 (at Ancestry/requires payment) includes scanned images from National Archives microfilm publication M1995 (Naturalization Petition and Record Books for the U.S. District Court for the Northern District of Ohio, Eastern Division, Cleveland, 1907-1946)
- Coshocton Public Library Genealogy and Local History - includes "Index to Naturalization Documents" PDF document
- Cuyahoga County Probate Court Naturalization Indexes, 1859-1901
- Hamilton County and Cincinnati: Finding Naturalization Records in Cincinnati & Hamilton County, Ohio
- Lake County, Ohio Naturalization Records Index from the Lake County Genealogical Society
- Lawrence County...
- Miami County Naturalization Records, 1860-1872
- Ottawa and Sandusky Counties: Naturalization Records from the Harris-Elmore Public Library
- Stark County Naturalization Records Index (about Sept 1906 and later) includes downloadable PDF images of the naturalization papers
- Summit County Ohio Naturalization Records Search includes PDF images
- Summit County Naturalizations Index Volume A, 1840-1858
- Warren County, Ohio Naturalizations, 1821-1925
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