- Machine Shop & Tool Repair Service, Coatesville
- Machine Shops Slings, Coatesville
- Machinery, Supplies & Equipment - Business Production Related, Coatesville
- Machinery, Supplies & Equipment - Business Supplies Related, Coatesville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Coatesville
- Mailing, Delivery & Courier Service, Coatesville
- Maintenance, Cleaning & Sanitation, Coatesville
- Major Appliances, Coatesville - Household & Kitchen
- Malls & Shopping Centers, Coatesville
- Management Consultants & Services, Coatesville
- Manicurists & Pedicurists, Coatesville
- Manufacturers Agents & Representatives, Coatesville
- Manufacturers Representative, Coatesville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Coatesville
- Manufacturing Products, Coatesville
- Marine Products And Services, Coatesville
- Marine Repair & Service Stations, Coatesville
- Marine Supplies & Equipment, Coatesville - Boat Supplies
- Marine Supplies & Equipment Repair, Coatesville - Boat Supplies & Equipment
- Market Research & Analysis , Coatesville - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Coatesville
- Martial Arts & Self Defense Schools, Coatesville
- Masonry Contractors, Coatesville - Stone Mason, Brick Mason - Install & Repair
- Meat Market, Wholesale & Products, Coatesville
- Mechanical Contractors, Coatesville - Install, Service & Repair
- Medical & Health Service Organizations, Coatesville
- Medical Groups & Clinics, Coatesville - Medical & Health Centers
- Medical Records Service , Coatesville
- Medical Supplies & Equipment, Coatesville
- Membership Sports & Recreation Clubs, Coatesville
- Men's & Boys Clothing & Accessories Stores, Coatesville
- Mennonite Church, Coatesville
- Mens & Boys Belts & Suspenders, Coatesville
- Mental & Developmental Information & Referral Services, Coatesville
- Mental Health Specialists, Coatesville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Coatesville
- Metal Finishers, Coatesville
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- Metal Plating & Polishing, Coatesville
- Metal Repair Service & Blacksmith, Coatesville - Iron Works
- Metal Roll Forming Manufacturers, Coatesville
- Metal Specialties, Coatesville
- Metal Working Machinery, Coatesville
- Methodist Church, Coatesville
- Mexican Restaurants, Coatesville
- Military Supplies, Coatesville
- Mining, Coatesville
- Mining Services, Coatesville
- Ministries Church, Coatesville
- Mirrors, Coatesville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Agriculture, Coatesville
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Coatesville
- Miscellaneous Government, Coatesville
- Miscellaneous Manufacturing, Coatesville
- Miscellaneous Metal Work Manufacturers, Coatesville
- Miscellaneous Personal Services, Coatesville
- Miscellaneous Photographers, Coatesville
- Miscellaneous Professional, Coatesville
- Mission Churches, Coatesville
- Mobile Home Parks & Communities , Coatesville
- Mortgage Bankers & Correspondents, Coatesville
- Mortgage Companies, Coatesville
- Motion Picture Pre & Post Production Services, Coatesville
- Motor Vehicle, Coatesville
- Motor Vehicle Rental & Leasing, Coatesville
- Moving Supplies & Equipment Rental, Coatesville
- Moving Truck Rental , Coatesville
- Muffler Shop & Exhaust Systems, Coatesville
- Mulch, Peat & Moss Products, Coatesville
- Museums, Coatesville
- Music, Coatesville
- Musical Instruments & Equipment Stores, Coatesville
- Musical Instruments Repair, Sales & Service, Coatesville
- Musical Recording Services, Coatesville
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