- Machine Shop, Chambersburg
- Machine Shop & Tool Repair Service, Chambersburg
- Machine Tool Repair & Rebuild, Chambersburg
- Machinery And Equipment Manufacturers, Chambersburg
- Machinery Movers & Erectors, Chambersburg
- Machinery, Supplies & Equipment - Business Production Related, Chambersburg
- Machinery, Supplies & Equipment - Business Supplies Related, Chambersburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Chambersburg
- Mailbox Rental Services, Chambersburg
- Mailing, Delivery & Courier Service, Chambersburg
- Maintenance, Cleaning & Sanitation, Chambersburg
- Major Appliances, Chambersburg - Household & Kitchen
- Malls & Shopping Centers, Chambersburg
- Mammography Clinics, Chambersburg - Breast Cancer Screening
- Management Consultants & Services, Chambersburg
- Management Training Schools, Chambersburg
- Manicurists & Pedicurists, Chambersburg
- Manufactured & Mobile Home Movers & Transporting, Chambersburg
- Manufacturers Agents & Representatives, Chambersburg
- Manufacturers Representative, Chambersburg - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Chambersburg
- Manufacturing Products, Chambersburg
- Manufacturing Services, Chambersburg
- Marriage & Family Counselors, Chambersburg
- Martial Arts & Self Defense Schools, Chambersburg
- Masonry Contractors, Chambersburg - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Chambersburg
- Massage Therapists & Professional, Chambersburg
- Massage Therapy, Chambersburg
- Mausoleums Developers, Chambersburg
- Meat Market, Wholesale & Products, Chambersburg
- Mechanical Contractors, Chambersburg - Install, Service & Repair
- Medical Groups & Clinics, Chambersburg - Medical & Health Centers
- Medical Supplies & Equipment, Chambersburg
- Meeting & Event Planning Services, Chambersburg - Conference Consultants
- Membership Sports & Recreation Clubs, Chambersburg
- Mennonite Church, Chambersburg
- Mental Health Clinics, Chambersburg - Treatment Centers
- Mental Health Specialists, Chambersburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Chambersburg
- Merle Norman Cosmetics, Chambersburg
- Messenger Service, Chambersburg - Message Receiving & Forwarding Service
- Metal Buildings, Chambersburg - Kits, Homes, Steel Buildings, etc
- Methodist Church, Chambersburg
- Mexican Restaurants, Chambersburg
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- Midwives, Chambersburg
- Mildew Removal & Control, Chambersburg - Mold Removal
- Military Supplies, Chambersburg
- Mini & Self Storage, Chambersburg
- Mining, Chambersburg
- Ministries Church, Chambersburg
- Mirrors, Chambersburg - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Chambersburg
- Miscellaneous Household Item Repair, Chambersburg
- Miscellaneous Agriculture, Chambersburg
- Miscellaneous Business Services, Chambersburg
- Miscellaneous Government, Chambersburg
- Miscellaneous Industry, Chambersburg
- Miscellaneous Manufacturing, Chambersburg
- Miscellaneous Personal Services, Chambersburg
- Miscellaneous Photographers, Chambersburg
- Miscellaneous Professional, Chambersburg
- Mission Churches, Chambersburg
- Mobile Home Contractors, Chambersburg
- Mobile Home Improvements & Repairs, Chambersburg
- Mobile Home Parks & Communities , Chambersburg
- Money Change Machines, Chambersburg
- Money Counting & Wrapping, Chambersburg
- Monuments, Tombstones, Markers & Memorials, Chambersburg
- Mortgage Bankers & Correspondents, Chambersburg
- Mortgages & Loans, Chambersburg
- Motion Picture Pre & Post Production Services, Chambersburg
- Motor Vehicle, Chambersburg
- Motor Vehicle Rental & Leasing, Chambersburg
- Motorcycle & Motor Scooters Dealers, Repair & Service, Chambersburg
- Motorcycle Parts, Accessories & Dealers, Chambersburg
- Motorcycle Repair & Service, Chambersburg
- Movie Theaters, Chambersburg
- Moving & Storage Supplies & Equipment, Chambersburg
- Moving Companies, Chambersburg
- Moving Truck Rental , Chambersburg
- Muffler Shop & Exhaust Systems, Chambersburg
- Mulch, Peat & Moss Products, Chambersburg
- Museums, Chambersburg
- Music, Chambersburg
- Music Lessons, Chambersburg
- Music Lessons - Instrumental, Chambersburg
- Musical Instrument Manufacturers, Chambersburg
- Musical Instruments & Equipment Stores, Chambersburg
- Musical Recording Services, Chambersburg
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