- Machine Shop & Tool Repair Service, Souderton
- Machinery, Supplies & Equipment - Business Supplies Related, Souderton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Souderton
- Mailing, Delivery & Courier Service, Souderton
- Maintenance, Cleaning & Sanitation, Souderton
- Major Appliances, Souderton - Household & Kitchen
- Management Consultants & Services, Souderton
- Manicurists & Pedicurists, Souderton
- Manufacturers Agents & Representatives, Souderton
- Manufacturers Representative, Souderton - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Souderton
- Manufacturing & Industrial Consultants, Souderton
- Manufacturing Products, Souderton
- Marking, Stamping & Engraving Equipment, Souderton
- Marriage & Family Counselors, Souderton
- Martial Arts & Self Defense Schools, Souderton
- Masonry Contractors, Souderton - Stone Mason, Brick Mason - Install & Repair
- Massage Therapy, Souderton
- Material Handling Equipment, Souderton - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Souderton
- Meat Packers, Souderton
- Medical Alert Systems, Souderton - Medical Alarms - PERS
- Medical Diagnostic Clinics, Souderton - Clinical Labs & Centers
- Medical Groups & Clinics, Souderton - Medical & Health Centers
- Medical Records Service , Souderton
- Medical Research, Souderton
- Medical Research & Development, Souderton - Medical Information & Research
- Medical Supplies & Equipment, Souderton
- Mennonite Church, Souderton
- Mental & Developmental Information & Referral Services, Souderton
- Mental Health Specialists, Souderton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Goods Alloys, Souderton
- Metal Heat Treating, Souderton
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- Metal Repair Service & Blacksmith, Souderton - Iron Works
- Middle Eastern Restaurants, Souderton
- Mildew Removal & Control, Souderton - Mold Removal
- Mini & Self Storage, Souderton
- Mining, Souderton
- Miscellaneous Business Credit Institutions & Services, Souderton
- Miscellaneous Household Item Repair, Souderton
- Miscellaneous Government, Souderton
- Miscellaneous Manufacturing, Souderton
- Miscellaneous Personal Services, Souderton
- Miscellaneous Photographers, Souderton
- Miscellaneous Professional, Souderton
- Mission Churches, Souderton
- Mobile Home Parks & Communities , Souderton
- Modular & Mobile Homes For Sale, Souderton - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Souderton
- Motion Picture Pre & Post Production Services, Souderton
- Motor Vehicle, Souderton
- Motor Vehicle Rental & Leasing, Souderton
- Motorcycle & Motor Scooters Dealers, Repair & Service, Souderton
- Motorcycle Parts, Accessories & Dealers, Souderton
- Motorcycle Repair & Service, Souderton
- Moving & Storage Consultants, Souderton
- Moving & Storage Supplies & Equipment, Souderton
- Moving Companies, Souderton
- Moving Supplies & Equipment Rental, Souderton
- Moving Truck Rental , Souderton
- Muffler Shop & Exhaust Systems, Souderton
- Music, Souderton
- Musical Instrument Rental, Souderton - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Souderton
- Musical Instruments Repair, Sales & Service, Souderton
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