- Metropolitan Washing Machine Company1
- Michigan Bolt & Nut Works1
- Millard & Whitman1
- Miller & Co.1
- Miller Bro's1
- Miller Oil and Supply Co.3
- Miller Safe Company1
- Miller, Greiner & Co.1
- Milliken, Tomlinson Company1
- Milton Dairy Company1
- Miner, Beal & Co.1
- Minneapolis Iron Store Company3
- Minnesota Moline Plow Co.1
- Mishawaka Woolen Mfg. Co.1
- Missoula Mercantile Company1
- Mitchell & Lewis Co.1
- Mme. Demorest's Emporium of Fashion1
- Model Dairy Company1
- Mohr & Yoerk Packing Company1
- Moller & Schumann1
- Monmouth Pottery Co.2
- Monroe County Chemical Company1
- Montana Brewing Co.1
- Montgomery Ward3
- Moody, Estabrook & Andersons1
- Moore M'f'g & Foundry Co.1
- Moorehead & Templeman Bros.1
- Morris Oppenheim1
- Morrison, Colwell & Page1
- Morton1
- Mound City Boot and Shoe Co.1
- Mound City Paint and Color Co.1
- Mount Desert Livery1
- Mount Livermore House1
- Mt. Upton Woolen Mills1
- Mueller-Keller Candy Co.1
- Mulligan & Brazo1
- Munn Wired Envelope Company1
- Murray Hill Bank1
- Murray Hill Hotel2
- Mutual Fertilizing Company1
- Myers & Company2
- N. & G. Taylor Co.1
- N. C. Newell & Son1
- N. Reynolds & Co.1
- N. Whitman & Son1
- Nahant House1
- Nash-Smith Tea and Coffee Co.1
- Nashville Bridge Company1
- Nassau Smelting & Refining Works1
- National Bank of Lawrence1
- National Cash Register Co.1
- National Exchange Bank2
- National India Rubber Company1
- National Newark Banking Company1
- National Paper Company1
- National Papeterie Co.1
- National Park Bank1
- National Rubber Co.1
- National State Capital Bank1