Naturalizations for Franklin County, Indiana may be found in:

• Court Order Books (See Franklin County Court Records)
• Probate Order Books (See Franklin County Probate Records)
• Separate naturalization volumes

Online:

• Naturalizations from court books, 1815-1857
• Naturalizations, 1826-1854

Family History Library Microfilm:

• Naturalizations, 1820-1854

Books:

• An Index to Naturalization Records in Pre-1907 Indiana County Courts. Indiana Historical Society : Indianapolis, 2001. [Amazon Affiliate Link]