The Midwestern United States includes at least one state.
The Midwestern United States , also referred to as the American Midwest or simply the Midwest , is one of the four geographic regions defined by the United States Census Bureau , occupying the northern central part of the United States of America . Illinois is the most populous of the states and North Dakota the least . The East North Central Division includes Illinois , Indiana , Michigan , Ohio and Wisconsin , all of which are also part of the Great Lakes region .