The Library owns microfilm copies of naturalizations from the Common Pleas Court (1820-1854), the District Court (1852-1884), and the Probate Court (1820-1906). As with the vital records, each microfilmed book contains an index that groups entries by the first letter of the last name. The Library also has a print copy of An Index to Naturalization Records from Clark County, Ohio 1820-1906 and Greene County, Ohio 1831-1954, printed by Wright State University. The original naturalization records are housed in the University's Department of Archives and Special Collections.