- Machine Shop, Sykesville
- Machine Shop & Tool Repair Service, Sykesville
- Machinery, Supplies & Equipment - Business Supplies Related, Sykesville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sykesville
- Major Appliance Repair & Service, Sykesville
- Major Appliances, Sykesville - Household & Kitchen
- Malls & Shopping Centers, Sykesville
- Management Consultants & Services, Sykesville
- Manicurists & Pedicurists, Sykesville
- Manifold Business Forms Manufacturers, Sykesville
- Manufacturers Agents & Representatives, Sykesville
- Manufacturers Representative, Sykesville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Sykesville
- Manufacturing Products, Sykesville
- Market Research & Analysis , Sykesville - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Sykesville
- Martial Arts & Self Defense Schools, Sykesville
- Masonry Contractors, Sykesville - Stone Mason, Brick Mason - Install & Repair
- Masonry Contractors Commercial & Industrial, Sykesville
- Masonry Materials & Supplies, Sykesville
- Massage Therapists & Professional, Sykesville
- Massage Therapy, Sykesville
- Meat Market, Wholesale & Products, Sykesville
- Mechanical Contractors, Sykesville - Install, Service & Repair
- Mechanical Engineer, Sykesville - Mechanical Engineering Service
- Medical & Health Service Organizations, Sykesville
- Medical Billing Services, Sykesville
- Medical Diagnostic Clinics, Sykesville - Clinical Labs & Centers
- Medical Supplies & Equipment, Sykesville
- Membership Sports & Recreation Clubs, Sykesville
- Men's Clothing Stores, Sykesville - Clothes & Accessories
- Mental & Developmental Information & Referral Services, Sykesville
- Mental Health Clinics, Sykesville - Treatment Centers
- Mental Health Specialists, Sykesville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Sykesville
- Methodist Church, Sykesville
- Mexican Restaurants, Sykesville
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- Millwork Contractors, Sykesville
- Mini & Self Storage, Sykesville
- Miscellaneous Business Product Repair, Sykesville
- Miscellaneous Household Item Repair, Sykesville
- Miscellaneous Agriculture, Sykesville
- Miscellaneous Business Services, Sykesville
- Miscellaneous Government, Sykesville
- Miscellaneous Industry, Sykesville
- Miscellaneous Manufacturing, Sykesville
- Miscellaneous Personal Services, Sykesville
- Miscellaneous Professional, Sykesville
- Mobile Restaurants, Sykesville
- Modular & Mobile Homes For Sale, Sykesville - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Sykesville
- Mortgage Bankers & Correspondents, Sykesville
- Mortgages & Loans, Sykesville
- Mortgages Commercial & Industrial, Sykesville
- Motor Vehicle, Sykesville
- Motor Vehicle & Car Bodies & Assemblies Manufacturers, Sykesville
- Motor Vehicle Rental & Leasing, Sykesville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Sykesville
- Motorcycle Apparel, Sykesville
- Motorcycle Parts, Accessories & Dealers, Sykesville
- Motorcycle Repair & Service, Sykesville
- Moving Companies, Sykesville
- Moving Supplies & Equipment Rental, Sykesville
- Moving Truck Rental , Sykesville
- Muffler Shop & Exhaust Systems, Sykesville
- Mulch, Peat & Moss Products, Sykesville
- Music, Sykesville
- Music Entertainment, Sykesville
- Music Lessons, Sykesville
- Music Lessons - Instrumental, Sykesville
- Musical Instrument Rental, Sykesville - Band & Orchestra Instruments
- Musical Instruments Repair, Sales & Service, Sykesville
- Musicians, Bands & Disc Jockeys, Sykesville
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