Rhinelander, Wisconsin 2017 Population Estimate â 7,574 The Wisconsin Demographic Services Center projects the Rhinelander 2015 population as 7,540 people and the 2020 population as 7,625. If we assume that the population changes linearly between 2015 and 2020, then the Rhinelander 2017 population would be 7,574. Note: this value is a projection, not a count. The 2010 Decennial Census provides the most recent count of the Rhinelander population as 7,798 people.