- Machine Shop, Indiana
- Machine Shop & Tool Repair Service, Indiana
- Machinery, Supplies & Equipment - Business Production Related, Indiana
- Machinery, Supplies & Equipment - Business Supplies Related, Indiana
- Machinery, Supplies & Equipment - Construction & Contractor Related, Indiana
- Mail Delivery Service, Indiana
- Mailbox Rental Services, Indiana
- Mailing, Delivery & Courier Service, Indiana
- Major Appliance Repair & Service, Indiana
- Major Appliances, Indiana - Household & Kitchen
- Malls & Shopping Centers, Indiana
- Malpractice Attorneys & Lawyers, Indiana
- Malpractice Attorneys & Lawyers, Indiana
- Malpractice Lawyers & Attorneys, Indiana
- Management Consultants & Services, Indiana
- Manicurists & Pedicurists, Indiana
- Manufacturing, Indiana
- Manufacturing Equipment & Supplies, Indiana
- Manufacturing Products, Indiana
- Marble Contractors, Indiana - Installation, Cleaning & Removal Services
- Marble Manufacturers, Indiana
- Market Research & Analysis , Indiana - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Indiana
- Martial Arts & Self Defense Schools, Indiana
- Masonry Contractors, Indiana - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Indiana
- Massage Therapists & Professional, Indiana
- Massage Therapy, Indiana
- Material Handling & Heavy Machinery & Equipment, Indiana
- Mausoleums Developers, Indiana
- Meat Market, Wholesale & Products, Indiana
- Meat Packers, Indiana
- Medical & Dental Management, Indiana
- Medical Alert Systems, Indiana - Medical Alarms - PERS
- Medical Billing Services, Indiana
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Indiana
- Medical Research, Indiana
- Medical Research & Development, Indiana - Medical Information & Research
- Medical Supplies & Equipment, Indiana
- Mediterranean Restaurants, Indiana
- Membership Sports & Recreation Clubs, Indiana
- Men's Clothing Stores, Indiana - Clothes & Accessories
- Mental & Developmental Information & Referral Services, Indiana
- Mental Health Specialists, Indiana - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Indiana
- Merchandise Sales Events, Indiana
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- Metal Repair Service & Blacksmith, Indiana - Iron Works
- Metal Specialties, Indiana
- Metaphysical Churches, Indiana
- Methodist Church, Indiana
- Mexican Restaurants, Indiana
- Middle Eastern Restaurants, Indiana
- Millwork Contractors, Indiana
- Mini & Self Storage, Indiana
- Mining, Indiana
- Mining Contractors, Indiana - Mining Companies, Contractors & Brokers
- Mining Equipment & Supplies, Indiana
- Mining Equipment & Supplies Service & Repair, Indiana
- Mining Services, Indiana
- Mining, Crude-Oil Production, Indiana - Mining Companies
- Ministries Church, Indiana
- Miscellaneous Business Product Repair, Indiana
- Miscellaneous Household Item Repair, Indiana
- Miscellaneous Business Services, Indiana
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Indiana
- Miscellaneous Government, Indiana
- Miscellaneous Industry, Indiana
- Miscellaneous Personal Services, Indiana
- Miscellaneous Photographers, Indiana
- Miscellaneous Professional, Indiana
- Mobile Home Contractors, Indiana
- Mobile Home Improvements & Repairs, Indiana
- Mobile Home Parks & Communities , Indiana
- Mobile Homes Manufacturers Supplies & Equipment, Indiana
- Modular & Mobile Homes For Sale, Indiana - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Indiana
- Mortgage Bankers & Correspondents, Indiana
- Mortgages Commercial & Industrial, Indiana
- Motor Vehicle, Indiana
- Motor Vehicle Rental & Leasing, Indiana
- Motorcycle Parts, Accessories & Dealers, Indiana
- Movie Theaters, Indiana
- Moving & Storage Supplies & Equipment, Indiana
- Moving Companies, Indiana
- Moving Truck Rental , Indiana
- Muffler Shop & Exhaust Systems, Indiana
- Multimedia Publishers, Indiana - Multimedia Services & Systems
- Museums, Indiana
- Music, Indiana
- Music Lessons, Indiana
- Music Lessons - Instrumental, Indiana
- Musical Instruments Repair, Sales & Service, Indiana
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