Phone Numbers and Support. If you have a question about your bank account or another product you have through the Regions Bank then contact the Regions Bank Customer Service department. The telephone number is 800-734-4667.
Buffalo Grove is a village in Cook and Lake counties in the U.S. state of Illinois, within the northern suburbs of Chicago. As of the 2010 census, the village population was 41,496.
Buffalo Grove, Illinois - Basic Facts. The Village of Buffalo Grove had a population of 41,616 as of July 1, 2016. Buffalo Grove ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.