- Machine Shop & Tool Repair Service, Decatur
- Machinery, Supplies & Equipment - Business Production Related, Decatur
- Machinery, Supplies & Equipment - Business Supplies Related, Decatur
- Machinery, Supplies & Equipment - Construction & Contractor Related, Decatur
- Mailbox Rental Services, Decatur
- Mailing, Delivery & Courier Service, Decatur
- Maintenance, Cleaning & Sanitation, Decatur
- Major Appliances, Decatur - Household & Kitchen
- Manicurists & Pedicurists, Decatur
- Manufacturing, Decatur
- Manufacturing Products, Decatur
- Manufacturing Services, Decatur
- Marriage & Family Counselors, Decatur
- Masonry Materials & Supplies, Decatur
- Material Handling Equipment, Decatur - Conveyor Belt, Pallet Jack, Forklift, etc
- Mechanical Contractors, Decatur - Install, Service & Repair
- Medical Billing Services, Decatur
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Decatur
- Medical Supplies & Equipment, Decatur
- Membership Sports & Recreation Clubs, Decatur
- Men's & Boys Clothing & Accessories Stores, Decatur
- Mens & Boys Jeans & Western Wear Stores, Decatur
- Mental Health Clinics, Decatur - Treatment Centers
- Mental Health Specialists, Decatur - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Decatur
- Metal Buildings, Decatur - Kits, Homes, Steel Buildings, etc
- Methodist Church, Decatur
- Mexican Restaurants, Decatur
- Mini & Self Storage, Decatur
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- Mining, Decatur
- Miscellaneous Agriculture, Decatur
- Miscellaneous Business Services, Decatur
- Miscellaneous Government, Decatur
- Miscellaneous Industry, Decatur
- Miscellaneous Manufacturing, Decatur
- Miscellaneous Personal Services, Decatur
- Miscellaneous Photographers, Decatur
- Miscellaneous Professional, Decatur
- Mission Churches, Decatur
- Mobile Automobile Services, Decatur
- Mobile Home Parks & Communities , Decatur
- Monuments, Tombstones, Markers & Memorials, Decatur
- Mortgage Bankers & Correspondents, Decatur
- Mortgage Companies, Decatur
- Mortgages & Loans, Decatur
- Motor Sports, Decatur
- Motor Vehicle, Decatur
- Motor Vehicle Rental & Leasing, Decatur
- Motorcycle & Motor Scooters Dealers, Repair & Service, Decatur
- Motorcycle Parts, Accessories & Dealers, Decatur
- Motorcycle Repair & Service, Decatur
- Movie Theaters, Decatur
- Moving Companies, Decatur
- Moving Truck Rental , Decatur
- Museums, Decatur
- Music, Decatur
- Musical Instruments & Equipment Stores, Decatur
- Musical Instruments - Guitars, Decatur
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