The phone number for Zions Bank online banking customer service is 800-840-4999. As of May 2015, the line is staffed with representatives from 7 a.m. to 8 p.m. MT Monday through Saturday and from 8 a.m. to 2 p.m. MT on Sunday.
Customers also receive help with online banking by visiting their local Zions Bank branch, and the company offers answers to some of the most common online banking questions on the frequency asked questions page of its website.
Founded in 1873, Zions Bank has grown to nearly 500 offices in the western United States, as of 2015. The bank is headquartered in Salt Lake City, Utah.