Mercer Bancorp, Inc. operates as the bank holding company for Mercer Savings Bank that provides financial products and services to individuals and businesses in western Ohio. The company accepts checking accounts, savings accounts, and certificates of deposit. Its loan products include one- to four-family residential mortgage loans and agricultural real estate loans secured by properties; and multifamily real estate loans, commercial real estate loans, construction and land loans, home equity lines of credit, commercial and industrial loans, and consumer loans, as well as indirect automobile loans. It invests in securities; and provides online and mobile banking services. The company was founded in 1888 and is headquartered in Celina, Ohio.