- Machine Shop, Langhorne
- Machine Shop & Tool Repair Service, Langhorne
- Machinery, Supplies & Equipment - Business Production Related, Langhorne
- Machinery, Supplies & Equipment - Business Supplies Related, Langhorne
- Machinery, Supplies & Equipment - Construction & Contractor Related, Langhorne
- Magazine & Newspaper Stands, Langhorne - Dealers & Distributors
- Mail Delivery Service, Langhorne
- Mailbox Rental Services, Langhorne
- Mailboxes Retail, Langhorne
- Mailing, Delivery & Courier Service, Langhorne
- Major Appliance Repair & Service, Langhorne
- Major Appliances, Langhorne - Household & Kitchen
- Malls & Shopping Centers, Langhorne
- Mammography Clinics, Langhorne - Breast Cancer Screening
- Management Consultants & Services, Langhorne
- Manicurists & Pedicurists, Langhorne
- Manufacturers Agents & Representatives, Langhorne
- Manufacturers Representative, Langhorne - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Langhorne
- Manufacturing & Industrial Consultants, Langhorne
- Manufacturing Products, Langhorne
- Marine Contractors & Designers, Langhorne
- Market Research & Analysis , Langhorne - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Langhorne
- Martial Arts & Self Defense Schools, Langhorne
- Masonry Contractors, Langhorne - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Langhorne
- Massage Therapists & Professional, Langhorne
- Massage Therapy, Langhorne
- Material Handling & Heavy Machinery & Equipment, Langhorne
- Maternity Clothes & Clothing Stores, Langhorne - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Langhorne
- Mechanical Contractors, Langhorne - Install, Service & Repair
- Medical & Health Service Organizations, Langhorne
- Medical & Infectious Waste Disposal, Langhorne
- Medical Billing Services, Langhorne
- Medical Diagnostic Clinics, Langhorne - Clinical Labs & Centers
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Langhorne
- Medical Groups & Clinics, Langhorne - Medical & Health Centers
- Medical Supplies & Equipment, Langhorne
- Men's Clothing Stores, Langhorne - Clothes & Accessories
- Mental Health Specialists, Langhorne - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandising & Marketing Consultants, Langhorne
- Metal Repair Service & Blacksmith, Langhorne - Iron Works
- Metal Tanks, Langhorne
- Methodist Church, Langhorne
- Mexican Restaurants, Langhorne
- Microwave Ovens, Langhorne
- Mini & Self Storage, Langhorne
- Mirrors, Langhorne - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Credit Institutions & Services, Langhorne
- Miscellaneous Business Product Repair, Langhorne
- Miscellaneous Household Item Repair, Langhorne
- Miscellaneous Agriculture, Langhorne
- Miscellaneous Government, Langhorne
- Miscellaneous Manufacturing, Langhorne
- Miscellaneous Personal Services, Langhorne
- Miscellaneous Photographers, Langhorne
- Miscellaneous Professional, Langhorne
- Mobile Home Parks & Communities , Langhorne
- Modeling & Talent Agencies, Langhorne
- Modular & Mobile Homes For Sale, Langhorne - Manufactured Homes Sale & Service
- Moldings Materials, Langhorne
- Monuments, Tombstones, Markers & Memorials, Langhorne
- Mortgage Bankers & Correspondents, Langhorne
- Mortgages & Loans, Langhorne
- Motion Picture & Television Production Services, Langhorne
- Motor Vehicle, Langhorne
- Motor Vehicle Rental & Leasing, Langhorne
- Motorcycle & Motor Scooters Dealers, Repair & Service, Langhorne
- Motorcycle Parts, Accessories & Dealers, Langhorne
- Motorcycle Repair & Service, Langhorne
- Movie Theaters, Langhorne
- Moving & Storage Consultants, Langhorne
- Moving & Storage Supplies & Equipment, Langhorne
- Moving Companies, Langhorne
- Moving Truck Rental , Langhorne
- Mulch, Peat & Moss Products, Langhorne
- Music, Langhorne
- Music Entertainment, Langhorne
- Music Schools, Langhorne
- Musical Instrument Rental, Langhorne - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Langhorne
- Musical Instruments Repair, Sales & Service, Langhorne
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