- Machine Shop, Merrillville
- Machine Shop & Tool Repair Service, Merrillville
- Machine Tools , Merrillville
- Machinery Movers & Erectors, Merrillville
- Machinery, Supplies & Equipment - Business Production Related, Merrillville
- Machinery, Supplies & Equipment - Business Supplies Related, Merrillville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Merrillville
- Mail Delivery Service, Merrillville
- Mailbox Rental Services, Merrillville
- Mailing, Delivery & Courier Service, Merrillville
- Maintenance, Cleaning & Sanitation, Merrillville
- Major Appliances, Merrillville - Household & Kitchen
- Malls & Shopping Centers, Merrillville
- Malpractice Attorneys & Lawyers, Merrillville
- Malpractice Attorneys & Lawyers, Merrillville
- Malpractice Lawyers & Attorneys, Merrillville
- Management Consultants & Services, Merrillville
- Manicurists & Pedicurists, Merrillville
- Manufacturers Agents & Representatives, Merrillville
- Manufacturers Representative, Merrillville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Merrillville
- Manufacturing & Industrial Consultants, Merrillville
- Manufacturing Equipment & Supplies, Merrillville
- Manufacturing Products, Merrillville
- Marble Contractors, Merrillville - Installation, Cleaning & Removal Services
- Market Research & Analysis , Merrillville - Market Analysis, Business & Economic Research
- Markets & Grocers Equipment, Merrillville
- Marriage & Family Counselors, Merrillville
- Martial Arts & Self Defense Schools, Merrillville
- Mary Kay Cosmetics, Merrillville
- Masonry Contractors, Merrillville - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Merrillville
- Massage Therapy, Merrillville
- Material Handling Equipment, Merrillville - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Merrillville - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Merrillville
- Mechanical Contractors, Merrillville - Install, Service & Repair
- Medical & Dental Management, Merrillville
- Medical & Health Service Organizations, Merrillville
- Medical Billing Services, Merrillville
- Medical Diagnostic Clinics, Merrillville - Clinical Labs & Centers
- Medical Diagnostic Equipment Mobile, Merrillville
- Medical Supplies & Equipment, Merrillville
- Membership Sports & Recreation Clubs, Merrillville
- Men's & Boys Clothing & Accessories Stores, Merrillville
- Men's Clothing Stores, Merrillville - Clothes & Accessories
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- Men's Shoe Stores, Merrillville
- Mental Health Specialists, Merrillville - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Products, Merrillville
- Metal Repair Service & Blacksmith, Merrillville - Iron Works
- Metal Working Machinery, Merrillville
- Mexican Restaurants, Merrillville
- Middle Eastern Restaurants, Merrillville
- Mildew Removal & Control, Merrillville - Mold Removal
- Mini & Self Storage, Merrillville
- Mining, Merrillville
- Ministries Church, Merrillville
- Miscellaneous Business Product Repair, Merrillville
- Miscellaneous Household Item Repair, Merrillville
- Miscellaneous Business Services, Merrillville
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Merrillville
- Miscellaneous Government, Merrillville
- Miscellaneous Industry, Merrillville
- Miscellaneous Manufacturing, Merrillville
- Miscellaneous Personal Services, Merrillville
- Miscellaneous Photographers, Merrillville
- Miscellaneous Professional, Merrillville
- Mission Churches, Merrillville
- Mobile Home Contractors, Merrillville
- Mobile Home Improvements & Repairs, Merrillville
- Mortgage Bankers & Correspondents, Merrillville
- Mortgages & Loans, Merrillville
- Motion Picture & Television Production Services, Merrillville
- Motion Picture Dists & Producers, Merrillville
- Motor Vehicle, Merrillville
- Motor Vehicle Rental & Leasing, Merrillville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Merrillville
- Motorcycle Parts, Accessories & Dealers, Merrillville
- Motorcycle Repair & Service, Merrillville
- Movie Theaters, Merrillville
- Moving & Storage Supplies & Equipment, Merrillville
- Moving Companies, Merrillville
- Moving Services - Labor & Material, Merrillville
- Moving Truck Rental , Merrillville
- Muffler Shop & Exhaust Systems, Merrillville
- Music, Merrillville
- Music Entertainment, Merrillville
- Music Lessons, Merrillville
- Music Lessons - Instrumental, Merrillville
- Musical Instrument Rental, Merrillville - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Merrillville
- Musicians, Bands & Disc Jockeys, Merrillville
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