Whiteside County is a county located in the U.S. state of Illinois. As of the most recent data available, the county has a population of approximately 60,653 people, with a population density of about 88.54 persons per square mile.
The county spans a total land area of 685.00 square miles (1,774.00 square kilometers). The administrative center and county seat is Morrison, which often serves as a hub for local governance and services. The largest city within the county by population is Sterling.
Geographically, Whiteside County experiences varied elevations, with its highest point at Morrison 670 ft and its lowest point at Erie 590 ft. The region operates in the UTC-6.