Middlefield Banc Corp. Common Stock, also called Middlefield Bank, is a bank holding company, which through its subsidiary Middlefield Banking Company, engages in the provision of personal and commercial banking services. Read More Its banking services includchecking, savings, negotiable order of withdrawal accounts, money market accounts, time certificates of deposit, commercial loans, real estate loans, a variety of consumer loans, safe deposit facilities, and travelers' checks. The company was founded in 1988 and is headquartered in Middlefield, OH.