BMO Harris Bank, N.A. is a Chicago-based bank. It is a member of the Federal Reserve System.The bank is owned by BMO Financial Corporation, a holding company which in turn is owned by Bank of Montreal, also known as BMO Financial Group.BMO Harris offers more than 600 branches and 1,300 ATMs throughout Illinois, Indiana, Arizona, Missouri, Minnesota, Kansas, Florida, and Wisconsin. Over 14,500 are employed by BMO in the United States.