Riverbank is a city in Stanislaus County, California, United States. Take a look below for 10 interesting and fun facts about Riverbank, California, United States. 1. The population was 22,678 at the 2010 census, up from 15,826 at the 2000 census. 2. Incorporated on August 23, 1922, Riverbank’s official slogan is “City of Action.” 3….