BMO Harris is present in the USA. The central office is located in Chicago, but the bank is also conducts banking in Arizona, Kansas, Illinois, Indiana, Missouri, Minnesota, Wisconsin, and Florida with over 600 branches locations in the USA and 1,300 ATMs.
The bank is a member of the Federal Reserve System and is one of the 20 largest banks in the USA.
You can download BMO online banking USA at the link: https://www.bmoharris.com/main/personal.