Northern Indiana is a region of the U.S. State of Indiana, including 26 counties which border the states of Illinois, Michigan, and Ohio. Northern Indiana is also considered part of the Great Lakes Megalopolis. The area is generally classified into other sub-regions; Northwest Indiana (or the Calumet Region) is closely tied with Chicago economically, culturally, and politically and is part of the Chicago metropolitan area. The north central region (or Michiana) centers on South Bend metropolitan area, with economic connections to southwest Michigan. Northeast Indiana is centered on the Fort Wayne metropolitan area. The Northern Indiana landscape is physically characterized by very flat to very rolling terrain, ranging from 600 to 1,000 feet (180 to 300 m) above sea level. Glacial kettle lakes are found throughout Northeast Indiana, with sand dunes sharing the Lake Michigan shoreline with heavy industry in the northwest. Kosciusko County is home to the largest natural lake (Wawasee) and deepest natural lake (Tippecanoe) in the state of Indiana. The Eastern Continental Divide runs through the region following the top of the Valparaiso Moraine. Besides a few urban areas, much of Northern Indiana lies in the agricultural Corn Belt. Northern Indiana is known for having the third-highest Amish population in the U.S., especially in Allen, Adams, Elkhart, and LaGrange counties.

Plymouth is a city in Marshall County, Indiana, United States. The population is 9,033 in the 2020 census. It is the county seat of Marshall County. Plymouth was the site of the first retail outlet of defunct U.S. retailer Montgomery Ward in 1926.

Bloomington is a city in and the county seat of Monroe County in the central region of the U.S. state of Indiana. It is the seventh-largest city in Indiana and the fourth-largest outside the Indianapolis metropolitan area. According to the Monroe County History Center, Bloomington is known as the "Gateway to Scenic Southern Indiana". The city was established in 1818 by a group of settlers from Kentucky, Tennessee, the Carolinas, and Virginia who were so impressed with "a haven of blooms" that they called it Bloomington.The population was 79,168 at the 2020 census.Bloomington is the home to Indiana University Bloomington. Established in 1820, IU Bloomington has 45,328 students, as of September 2021, and is the original and largest campus of Indiana University. Most of the campus buildings are built of Indiana limestone. Bloomington has been designated a Tree City for 32 years, as of 2015. The city was also the location of the Academy Award–winning 1979 movie Breaking Away, featuring a reenactment of Indiana University's annual Little 500 bicycle race. Monroe County's famous limestone quarries are also featured in the movie.

Wabash is a city in Noble Township, Wabash County, in the U.S. state of Indiana. The population was 10,666 at the 2010 census. The city is the county seat of Wabash County.Wabash is notable as claiming to be the first electrically lighted city in the world, which was inaugurated on March 31, 1880. However, closer inspection of the reference shows only the court house grounds were lighted. It is also home to the historic Eagles Theatre, Paradise Spring Treaty Grounds (1826), the Wabash and Erie Canal, Presbyterian Church (1880), and Disciples of Christ Christian Church (1865).