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- The M. B. Skinner Company — pipe clamps for the gas age Businesses
- M. B. Skinner Company — the founding settled in part Businesses
- The M.R. Falcons: Nest 4 Private Clubs
- The machinery: a zone, an airport, and somebody else's port Exports
- Macri's: the Calabrian bakery of 1978 Food & Restaurants
- Madison Center and the making of the Memorial Epworth Center: 1949–2011 Hospitals
- Madison Center: the community mental health center Mental Health Institutions
- The magazine visitors: Hansel Mieth's census and George Strock's Bendix women Photographers
- Magyar Hall · the fire of 19 August 1917 and the man not found Wars, Unrest & Disasters
- The mail Jeeps: AM General's Dispatchers, and a South Bend assembly line Automobiles
- The Main Library block rebuilt Libraries
- Main Roads & Corridors Section
- Major Donations Section
- Major Events Section
- The Mall Screens and the Multiplex Theaters
- Malls & Shopping Section
- The Man in the Hall: Mike Muszar, 1917 Historical Mysteries
- The man never named · the fourth (or fifth) at the Merchants National Bank Robberies
- The Managers South Bend Blue Sox
- The managers: the roster as the directories give it License Branch
- The Manhole Murders · four men of the Fort, 2006–2007 Notable Murder Cases
- The manufacture test: what tractors were built in South Bend? Tractors
- The map today: a second palace, a moving museum Culture
- Marion O'Brien Donovan: formed at the Lathe Works, patented from Connecticut Inventors & Inventions
- Mark di Suvero: Keepers of the Fire Artists
- Mark Hazinski: The Table Tennis Olympian Sports Players
- Marked by its own hand: the Rotary marker and the landmark tour Historic Preservation
- The marker in bronze that gets it wrong Strange but True
- The markets: the city's curb market of 1911–1924, and the farmer's market that claims its line Food & Restaurants
- Marshals and first chiefs: the police before the modern line Public Servants
- Martin's Super Markets: the chain born on Portage Avenue Food & Restaurants
- The Masons: the lodges as institutions Private Clubs
- The Master Plan and the New Front Door Zoo
- Max Carey: Formed Here, Under a Borrowed Name Sports Players
- Maxine E. Ryer: the county’s first practicing woman lawyer Famous People
- May 1924 · the Klan comes downtown, and the students come down to meet it Major Events
- May 2020 · two marches, and a city that kept them peaceful Wars, Unrest & Disasters
- McDonald Studio: the house of 1861, and its 165 years Photographers
- McManus, Grant, and the Move to Playland: 1945–1947 South Bend Blue Sox
- Meat and sausage: the smokehouse scale of the Polish trade Food & Restaurants
- The mechanization curve, I: 287 machines to the 1959 peak Tractors
- The mechanization curve, II: the long thinning, 1974 – 2022 Tractors
- The Medal of Honor: two recipients, neither by the usual road War Heroes
- Medical Advancements Section
- A medical school on Angela Boulevard: IU School of Medicine—South Bend Medical Advancements
- Memorial Day: from the Grand Army's order to the West Side parade Veterans
- Memorial today: the flagship, its beds, and its tower Hospitals
- The Memorial tower: the first floor's move, on the hospital's own announcements South Bend Today
- The memorials and the namings War Heroes
- Mental Health Institutions Section
- The Merchants National Bank · the last Dillinger robbery Bank Robberies
- The Merchants' National Bank — Charter No. 6334 Banks
- The Methodists: The Circuit Class of 1831 and First Methodist Church Churches & Religion
- The Metronet — the city's own fiber Technology
- The Metronet: the region builds its own fiber Dot-Com Era
- The Mexican and Latino west side: from the migrant stream to La Casa Communities
- The Mexican War · no company, thirteen named men Wars, Unrest & Disasters
- Miami Hills and Miami Village Neighborhoods
- The Michigan Central's branch from Niles Railroads
- The Michigan Hotel and the American Hotel Hotels
- The Michigan Road: the treaty strip and the survey Main Roads & Corridors
- The middle of the century · the quiet decades, stated plainly Notable Murder Cases
- The Middle-School Line Today Schools & Colleges
- Mike Bennett: forty years at the stadium rail Photographers
- Mike Muszar and the Magyar Hall fire — the coroner's index read whole; the question still open Crime History
- Mike Salay: South Bend's postwar 500 starter Racing
- Military Section
- The military ground of City Cemetery Veterans
- The Military Honor Park at the airport Veterans
- The militia tradition · the county answers, April 1861 Military
- Millard Sheets and the Word of Life Artists
- Miller's Vets: a judge's second service Veterans
- Miller, Nemeth, Parent: the downtown builders Government
- Miller-Knoblock and Knoblock-Heidman — wagons, then magnetos Businesses
- A million dollars at halftime Lottery & Crypto
- Minstrelsy: the record at its surviving size Comedy
- The missing · two names the record still carries Cold Cases
- The Mission Era: Priests on the St. Joseph River, 1679-1831 Churches & Religion
- The modern composition: the censuses of 2000, 2010 and 2020, and the Hispanic series Population
- The modern course: mail, kiosks, and the Ireland Road branch License Branch
- The modern documentary line: ruins, a river path, and a neighborhood's portraits Photographers
- The Modern Era — the Century Center and the Present State of the Record Architecture
- The Modern Homicide Record, as the Official Counts Give It Crime History
- The modern ledger: what the federal count says Exports
- The modern police chiefs Public Servants
- The modern remnant: no Blass, and a working designer Fashion
- Money and power, in brief Businesses
- The money: a people's tax, the caps, and the 2019 fight Libraries
- The monuments and the riverfront works Artists
- The Moose: Lodge No. 58 Private Clubs
- The Morris — opened as the Palace, premiered the Rockne film, saved for a dollar Famous Landmarks
- The Morris — The Working Theatre's Own Ghosts Ghost Stories
- The Morris fortune's giving: an inn, a theatre saved for a dollar, and three generations of lead gifts Major Donations
- Morris Park Country Club Private Clubs
- The Morris–Raclin line: three generations of giving Arts
- The Motel Era, at the Size the Record Gives It Hotels
- The motor bus appears: 1923–1934 Public Transit
- The Mountain-Bike Trails Trails
- Moves, mergers, and the Benders, 1911–1917 Sports
- The muck farms and the mint Farms & Crops
- The Muessel Brewing Company: incorporation, the 1911 brewhouse, and the dry close Wineries & Distilleries
- The Muessel family brewery: sons, brands and the ground it gave the city Wineries & Distilleries
- Municipal excellence and the tree designation, at their true size National Honors
- A museum for Finn: the Children's Museum of South Bend Kids & Family Entertainment
- The museum in the carriage house: art, 1947 Culture
- The museum that left — the College Football Hall of Fame Museums
- The museum's name: "Regional," bounded Artists
- Museums Section
- Music Section