Northern Indiana

Northern Indiana is a geographic and cultural region that generally comprises the northern third of the U.S. state of Indiana and borders the states of Illinois to the west, Michigan to the north, and Ohio to the east. Spanning the state's northernmost 26 counties, its main population centers include Northwest Indiana (anchored by the cities of Hammond and Gary and part of the larger Chicago metropolitan area), Michiana (anchored by the cities of South Bend, Mishawaka, and Elkhart), and the Fort Wayne metropolitan area (anchored by the city of Fort Wayne).

Northern Indiana's physical geography was significantly shaped during Wisconsin glaciation, resulting in a till plain ranging from flat to gently rolling terrain, especially in the Wabash Valley. The region experiences a humid continental climate, supporting temperate deciduous forest, tallgrass prairie, and wetland ecosystems. In addition to Lake Michigan, more than 300 kettle lakes are located in the region, including the state's largest natural lake (Wawasee) and deepest natural lake (Tippecanoe). Following the Valparaiso Moraine, the Laurentian Divide meanders through the region, separating the watersheds of the Great Lakes Basin to the north from those of the Mississippi River drainage basin to the south.

Northern Indiana is situated within the larger Rust Belt and Corn Belt regions, influencing the area's geographic, economic, cultural, and political landscape. Home to about 2.3 million people, the region is defined by both its industrial cities and agricultural towns. Manufacturing remains a vital part of the region's economy, particularly in the production of recreational vehicles, medical devices, and steel. Protected areas include Indiana Dunes National Park and Indiana's most visited state park of the same name. Northern Indiana is home to about 25 public and private higher education institutions, including more than a dozen religiously affiliated colleges and universities. The region is split between the Eastern and Central time zones.

Major waterways include the Grand Calumet River, the Kankakee River, the Maumee River (St. Marys and St. Joseph rivers), the St. Joseph River (Elkhart River), and the Wabash River (Eel, Little, and Tippecanoe rivers). Besides Lake Michigan, other notable lakes and reservoirs include Lake Freeman, Lake George, Lake James, Lake Manitou, Lake Maxinkuckee, Lake Shafer, Lake Tippecanoe, Lake Wawasee, Webster Lake, and Wolf Lake.

Michiana, a portmanteau of "Michigan" and "Indiana", is a loosely defined sub-region that spans southwestern Michigan and Northern Indiana's north-central counties. It is centered on the South Bend–Elkhart–Mishawaka Combined Statistical Area and generally corresponds with Area code 574. Counties typically considered part of the Michiana sub-region include:

Northeast Indiana comprises the northeastern portion of Northern Indiana, centered on the Fort Wayne–Huntington–Auburn Combined Statistical Area and generally corresponding with Area code 260. Counties typically considered part of the Northeast Indiana sub-region include:

Northwest Indiana, colloquially known as "The Region", comprises the northwestern portion of Northern Indiana, centered on the southeastern extent of the Chicago metropolitan area and generally corresponding with Area code 219. Counties typically considered part of the Northwest Indiana sub-region include:

Benton and White counties have economic ties to the Lafayette–West Lafayette metropolitan area, typically considered part of Central Indiana. Cass and Miami counties have economic ties to the Kokomo metropolitan area, also typically considered part of Central Indiana. Portions of these counties fall within Area code 765.