Mount Morris is a village in Mount Morris Township, Ogle County, Illinois, United States. The population was 2,998 at the 2010 census, down from 3,013 in 2000. Mount Morris is located at 42°2′51″N 89°26′2″W (42.047614, -89.433972). According to the 2010 census, Mount Morris has a total area of 1.5 square miles (3.88 km²), all land. The village is crossed from east to west by Illinois Route 64. Route 64 continues eastward to Chicago and westward into Iowa, where is keeps its numeric designation