- Machine Shop & Tool Repair Service, Williamsport
- Machine Tools , Williamsport
- Machinery And Equipment Manufacturers, Williamsport
- Machinery, Supplies & Equipment - Business Production Related, Williamsport
- Machinery, Supplies & Equipment - Business Supplies Related, Williamsport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Williamsport
- Magazine & Newspaper Stands, Williamsport - Dealers & Distributors
- Mail Delivery Service, Williamsport
- Mailbox Rental Services, Williamsport
- Mailing, Delivery & Courier Service, Williamsport
- Maintenance, Cleaning & Sanitation, Williamsport
- Major Appliances, Williamsport - Household & Kitchen
- Malls & Shopping Centers, Williamsport
- Mammography Clinics, Williamsport - Breast Cancer Screening
- Management Consultants & Services, Williamsport
- Manicurists & Pedicurists, Williamsport
- Manifold Business Forms Manufacturers, Williamsport
- Manufactured & Mobile Homes Set Ups & Tear Downs, Williamsport
- Manufacturers Agents & Representatives, Williamsport
- Manufacturers Representative, Williamsport - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Williamsport
- Manufacturing & Industrial Consultants, Williamsport
- Manufacturing Products, Williamsport
- Marine Products And Services, Williamsport
- Marine Services, Williamsport
- Marriage & Family Counselors, Williamsport
- Martial Arts & Self Defense Schools, Williamsport
- Masonry Contractors, Williamsport - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Williamsport
- Massage Therapists & Professional, Williamsport
- Massage Therapy, Williamsport
- Material Handling & Heavy Machinery & Equipment, Williamsport
- Material Handling Equipment, Williamsport - Conveyor Belt, Pallet Jack, Forklift, etc
- Mats & Matting, Williamsport
- Meat Market, Wholesale & Products, Williamsport
- Mechanical Contractors, Williamsport - Install, Service & Repair
- Medical & Dental Associations, Williamsport
- Medical & Dental Management, Williamsport
- Medical & Health Service Organizations, Williamsport
- Medical Alert Systems, Williamsport - Medical Alarms - PERS
- Medical Groups & Clinics, Williamsport - Medical & Health Centers
- Medical Identification Jewelry, Williamsport
- Medical Research Facilities, Williamsport - Research & Development Centers
- Medical Supplies & Equipment, Williamsport
- Medicare Claims, Williamsport
- Mediterranean Restaurants, Williamsport
- Membership Sports & Recreation Clubs, Williamsport
- Men's Clothing Stores, Williamsport - Clothes & Accessories
- Mental Health Clinics, Williamsport - Treatment Centers
- Mental Health Specialists, Williamsport - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Williamsport
- Merle Norman Cosmetics, Williamsport
- Metal Buildings, Williamsport - Kits, Homes, Steel Buildings, etc
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- Metal Detecting Equipment, Williamsport
- Metal Repair Service & Blacksmith, Williamsport - Iron Works
- Metal Specialties, Williamsport
- Metal Stampings Manufacturers, Williamsport
- Methodist Church, Williamsport
- Mexican Restaurants, Williamsport
- Midwives, Williamsport
- Mildew Removal & Control, Williamsport - Mold Removal
- Millwork Contractors, Williamsport
- Minerals, Williamsport
- Mini & Self Storage, Williamsport
- Mining, Williamsport
- Mining Services, Williamsport
- Mirrors, Williamsport - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Williamsport
- Miscellaneous Agriculture, Williamsport
- Miscellaneous Business Services, Williamsport
- Miscellaneous Government, Williamsport
- Miscellaneous Manufacturing, Williamsport
- Miscellaneous Metal Work Manufacturers, Williamsport
- Miscellaneous Personal Services, Williamsport
- Miscellaneous Photographers, Williamsport
- Miscellaneous Professional, Williamsport
- Mobile Home Site Preparation, Williamsport
- Monuments, Tombstones, Markers & Memorials, Williamsport
- Mopeds, Scooter & Mini-Bikes Parts, Accessories & Dealers, Williamsport
- Mortgage Bankers & Correspondents, Williamsport
- Mortgage Companies, Williamsport
- Mortgages & Loans, Williamsport
- Motion Picture Pre & Post Production Services, Williamsport
- Motor Vehicle, Williamsport
- Motor Vehicle Rental & Leasing, Williamsport
- Motorcycle & Motor Scooters Dealers, Repair & Service, Williamsport
- Motorcycle Parts, Accessories & Dealers, Williamsport
- Motorcycle Repair & Service, Williamsport
- Motorcycles Paint & Refinishing, Williamsport
- Motorized Bicycle & Scooter, Williamsport
- Movie Theaters, Williamsport
- Moving & Storage Supplies & Equipment, Williamsport
- Moving Companies, Williamsport
- Moving Supplies & Equipment Rental, Williamsport
- Moving Truck Rental , Williamsport
- Muffler Shop & Exhaust Systems, Williamsport
- Museums, Williamsport
- Music, Williamsport
- Music Entertainment, Williamsport
- Music Lessons, Williamsport
- Music Lessons - Instrumental, Williamsport
- Music Schools, Williamsport
- Musical Instruments & Equipment Stores, Williamsport
- Musical Instruments Repair, Sales & Service, Williamsport
- Musical Recording Services, Williamsport
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