Middlefield Banc Corp. operates as the bank holding company for The Middlefield Banking Company that provides various commercial banking services to small and medium-sized businesses, professionals, small business owners, and retail customers in northeastern and central Ohio. The company offers checking, savings, and negotiable order of withdrawal accounts, money market accounts, time certificates of deposit, commercial loans, real estate loans, various consumer loans, safe deposit facilities, and travelers’ checks. It also provides operational and working capital, term business, residential construction, professional, and residential and mortgage loans, as well as consumer installment loans for home improvements, automobiles, boats, and other personal expenditures; loans to finance capital purchases; selected guaranteed or subsidized loan programs for small businesses; and agricultural loans.