- Machine Shop & Tool Repair Service, Dekalb
- Machinery, Supplies & Equipment - Business Production Related, Dekalb
- Machinery, Supplies & Equipment - Business Supplies Related, Dekalb
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dekalb
- Mailbox Rental Services, Dekalb
- Mailing, Delivery & Courier Service, Dekalb
- Maintenance, Cleaning & Sanitation, Dekalb
- Major Appliances, Dekalb - Household & Kitchen
- Malls & Shopping Centers, Dekalb
- Management Consultants & Services, Dekalb
- Manicurists & Pedicurists, Dekalb
- Manifold Business Forms Manufacturers, Dekalb
- Manufacturing, Dekalb
- Manufacturing Products, Dekalb
- Marinas & Aquariums, Dekalb
- Marine Supplies & Equipment, Dekalb - Boat Supplies
- Marketing, Dekalb
- Marriage & Family Counselors, Dekalb
- Martial Arts & Self Defense Schools, Dekalb
- Masonry Contractors, Dekalb - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Dekalb
- Massage Therapy, Dekalb
- Meat Market, Wholesale & Products, Dekalb
- Meat Packers, Dekalb
- Mechanical Contractors, Dekalb - Install, Service & Repair
- Mechanical Engineer, Dekalb - Mechanical Engineering Service
- Medical Groups & Clinics, Dekalb - Medical & Health Centers
- Medical Supplies & Equipment, Dekalb
- Mental Health Clinics, Dekalb - Treatment Centers
- Mental Health Specialists, Dekalb - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Finishers, Dekalb
- Metal Plating & Polishing, Dekalb
- Metal Repair Service & Blacksmith, Dekalb - Iron Works
- Metal Working Machinery, Dekalb
- Metaphysical Churches, Dekalb
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- Methodist Church, Dekalb
- Mexican Restaurants, Dekalb
- Mildew Removal & Control, Dekalb - Mold Removal
- Mini & Self Storage, Dekalb
- Mini Golf Courses, Dekalb
- Miscellaneous Household Item Repair, Dekalb
- Miscellaneous Business Services, Dekalb
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Dekalb
- Miscellaneous Government, Dekalb
- Miscellaneous Industry, Dekalb
- Miscellaneous Manufacturing, Dekalb
- Miscellaneous Personal Services, Dekalb
- Miscellaneous Photographers, Dekalb
- Miscellaneous Professional, Dekalb
- Mobile Home Parks & Communities , Dekalb
- Modular & Mobile Homes For Sale, Dekalb - Manufactured Homes Sale & Service
- Money Transfer Service, Dekalb
- Mortgage Bankers & Correspondents, Dekalb
- Motor Vehicle, Dekalb
- Motor Vehicle Rental & Leasing, Dekalb
- Motorcycle & ATV Repair & Service, Dekalb
- Motorcycle Parts, Accessories & Dealers, Dekalb
- Motorcycle Repair & Service, Dekalb
- Movie Theaters, Dekalb
- Moving & Storage Supplies & Equipment, Dekalb
- Moving Companies, Dekalb
- Moving Supplies & Equipment Rental, Dekalb
- Moving Truck Rental , Dekalb
- Muffler Shop & Exhaust Systems, Dekalb
- Museums, Dekalb
- Music, Dekalb
- Music Entertainment, Dekalb
- Musical Instruments & Equipment Stores, Dekalb
- Musical Instruments - Guitars, Dekalb
- Musicians, Bands & Disc Jockeys, Dekalb
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