- Machine Shop & Tool Repair Service, East Chicago
- Machinery, Supplies & Equipment - Business Production Related, East Chicago
- Machinery, Supplies & Equipment - Construction & Contractor Related, East Chicago
- Major Appliances, East Chicago - Household & Kitchen
- Management Consultants & Services, East Chicago
- Manicurists & Pedicurists, East Chicago
- Manufacturing, East Chicago
- Manufacturing Products, East Chicago
- Marine Supplies & Equipment, East Chicago - Boat Supplies
- Marriage & Family Counselors, East Chicago
- Masonry Materials & Supplies, East Chicago
- Meat Market, Wholesale & Products, East Chicago
- Men's & Boys Clothing & Accessories Stores, East Chicago
- Mens & Boys Jeans & Western Wear Stores, East Chicago
- Metal Coating & Allied Services, East Chicago
- Metal Heat Treating, East Chicago
- Metal Specialties, East Chicago
- Metal Working Machinery, East Chicago
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- Methodist Church, East Chicago
- Mexican Restaurants, East Chicago
- Millwork Contractors, East Chicago
- Mining, East Chicago
- Mining Equipment & Supplies, East Chicago
- Miscellaneous Government, East Chicago
- Miscellaneous Industry, East Chicago
- Miscellaneous Professional, East Chicago
- Motor Vehicle, East Chicago
- Motor Vehicle Rental & Leasing, East Chicago
- Moving Supplies & Equipment Rental, East Chicago
- Moving Truck Rental , East Chicago
- Muffler Shop & Exhaust Systems, East Chicago
- Music, East Chicago
- Musical Instrument Manufacturers, East Chicago
- Musical Instruments & Equipment Stores, East Chicago
- Musical Instruments Supplies & Accessories Manufacturers, East Chicago
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