- Machine Shop & Tool Repair Service, Chalfont
- Machinery, Supplies & Equipment - Business Production Related, Chalfont
- Machinery, Supplies & Equipment - Business Supplies Related, Chalfont
- Machinery, Supplies & Equipment - Construction & Contractor Related, Chalfont
- Maintenance, Cleaning & Sanitation, Chalfont
- Major Appliances, Chalfont - Household & Kitchen
- Malls & Shopping Centers, Chalfont
- Management Consultants & Services, Chalfont
- Manicurists & Pedicurists, Chalfont
- Manufacturing, Chalfont
- Manufacturing Products, Chalfont
- Market Research & Analysis , Chalfont - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Chalfont
- Martial Arts & Self Defense Schools, Chalfont
- Masonry Contractors, Chalfont - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Chalfont
- Massage Therapists & Professional, Chalfont
- Massage Therapy, Chalfont
- Material Handling Equipment, Chalfont - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Chalfont
- Mechanical Contractors, Chalfont - Install, Service & Repair
- Medical & Health Service Organizations, Chalfont
- Medical Diagnostic Clinics, Chalfont - Clinical Labs & Centers
- Medical Records Service , Chalfont
- Medical Research, Chalfont
- Medical Research & Development, Chalfont - Medical Information & Research
- Medical Supplies & Equipment, Chalfont
- Medical Transcription Service, Chalfont
- Membership Sports & Recreation Clubs, Chalfont
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- Mennonite Church, Chalfont
- Mental Health Specialists, Chalfont - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Shapes Extruded, Chalfont
- Methodist Church, Chalfont
- Mexican Restaurants, Chalfont
- Middle Eastern Restaurants, Chalfont
- Mildew Removal & Control, Chalfont - Mold Removal
- Military Supplies, Chalfont
- Millwork Contractors, Chalfont
- Mini & Self Storage, Chalfont
- Miscellaneous Business Product Repair, Chalfont
- Miscellaneous Household Item Repair, Chalfont
- Miscellaneous Business Services, Chalfont
- Miscellaneous Government, Chalfont
- Miscellaneous Industry, Chalfont
- Miscellaneous Personal Services, Chalfont
- Miscellaneous Photographers, Chalfont
- Miscellaneous Professional, Chalfont
- Mobile Home Parks & Communities , Chalfont
- Modular & Mobile Homes For Sale, Chalfont - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Chalfont
- Mortgages & Loans, Chalfont
- Motor Vehicle, Chalfont
- Motor Vehicle Rental & Leasing, Chalfont
- Moving Companies, Chalfont
- Moving Supplies & Equipment Rental, Chalfont
- Moving Truck Rental , Chalfont
- Muffler Shop & Exhaust Systems, Chalfont
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