OFFICE DETAILS. Zions Bank Head Office branch is one of the 123 offices of the bank and has been serving the financial needs of their customers in Salt Lake City, Salt Lake county, Utah since 1873. Head Office office is located at 1 Main Street, Salt Lake City. You can also contact the bank by calling the branch phone number at 801-844-7084.. Zions Bank Login,Zions Bank Login Business,Zions Bank Review Detail 2022 Zions Bank Login Utah's oldest bank, Zions Bank, was established in Salt Lake City in 1873 under the guidance of Brigham Young, making it the oldest bank in the state. The bank has been in existence for longer than the state of Utah has been. Zions Bank and Trust Company has been.