- Machine Shop, Horsham
- Machine Shop & Tool Repair Service, Horsham
- Machine Tools , Horsham
- Machinery, Supplies & Equipment - Business Production Related, Horsham
- Machinery, Supplies & Equipment - Business Supplies Related, Horsham
- Machinery, Supplies & Equipment - Construction & Contractor Related, Horsham
- Magnetic Devices, Horsham
- Magnets & Magnetic Devices, Horsham
- Mailing List Service, Brokers & Compilers, Horsham
- Mailing, Delivery & Courier Service, Horsham
- Management Consultants & Services, Horsham
- Manicurists & Pedicurists, Horsham
- Manifold Business Forms Manufacturers, Horsham
- Manufacturers Agents & Representatives, Horsham
- Manufacturers Representative, Horsham - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Horsham
- Manufacturing & Industrial Consultants, Horsham
- Manufacturing Equipment & Supplies, Horsham
- Manufacturing Products, Horsham
- Market Research & Analysis , Horsham - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Horsham
- Masonry Contractors, Horsham - Stone Mason, Brick Mason - Install & Repair
- Masonry Contractors Commercial & Industrial, Horsham
- Masonry Materials & Supplies, Horsham
- Massage Therapists & Professional, Horsham
- Massage Therapy, Horsham
- Massage Therapy Relaxation, Horsham
- Material Handling & Heavy Machinery & Equipment, Horsham
- Material Handling Equipment, Horsham - Conveyor Belt, Pallet Jack, Forklift, etc
- Mausoleum Builders, Horsham
- Meat Market, Wholesale & Products, Horsham
- Medical & Health Service Organizations, Horsham
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- Medical Billing Services, Horsham
- Medical Diagnostic Clinics, Horsham - Clinical Labs & Centers
- Medical Equipment Manufacturers, Horsham
- Medical Records Service , Horsham
- Medical Supplies & Equipment, Horsham
- Membership Sports & Recreation Clubs, Horsham
- Mental Health Specialists, Horsham - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Products, Horsham
- Mexican Restaurants, Horsham
- Microwave Communications, Horsham
- Mind-Body Massage, Horsham
- Mining, Horsham
- Mirrors, Horsham - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Horsham
- Miscellaneous Government, Horsham
- Miscellaneous Manufacturing, Horsham
- Miscellaneous Professional, Horsham
- Monuments, Tombstones, Markers & Memorials, Horsham
- Mortgage Bankers & Correspondents, Horsham
- Mortgages & Loans, Horsham
- Motion Picture Pre & Post Production Services, Horsham
- Motor Vehicle, Horsham
- Motor Vehicle Rental & Leasing, Horsham
- Motorcycle & Motor Scooters Dealers, Repair & Service, Horsham
- Motorcycle Parts, Accessories & Dealers, Horsham
- Motorcycle Repair & Service, Horsham
- Moving Companies, Horsham
- Moving Truck Rental , Horsham
- Mulch, Peat & Moss Products, Horsham
- Museums, Horsham
- Music, Horsham
- Musical Instruments & Equipment Stores, Horsham
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