This collection consists of records from the Mercer County (Ohio) Auditor's office.

The collection consists of records of the Mercer County (Ohio) Board of Education, including: Attendance Officers Records (1921-1934); Common School Funds Records (1839-1903); Common School Registers (1852-1861); Examination Records of Pupils and Teachers (1853-1935); Teachers' Institute Minutes (1892-1929); and Teachers' Institute Miscellaneous Papers (1924-1925).

This collection consists of records from the Mercer County (Ohio) Clerk of Courts office.

This collection consists of records of the Mercer County (Ohio) County Home.

This collection consists of records from the Mercer County (Ohio) Health Department. The contents mostly relate to migrant labor camps.

This collection consists of records of the Mercer County (Ohio) Probate Court.

The collection consists of records from the Mercer County (Ohio) Recorder's office, including Limited Partnership Records and Stallion Services index.

The Mercer County (Ohio) Treasurer Records include Examination of the Treasury and Liquor Tax Duplicates (scattered).