- Machine Shop & Tool Repair Service, Prince Frederick
- Machinery, Supplies & Equipment - Business Production Related, Prince Frederick
- Machinery, Supplies & Equipment - Business Supplies Related, Prince Frederick
- Machinery, Supplies & Equipment - Construction & Contractor Related, Prince Frederick
- Mailing, Delivery & Courier Service, Prince Frederick
- Maintenance, Cleaning & Sanitation, Prince Frederick
- Major Appliances, Prince Frederick - Household & Kitchen
- Management Consultants & Services, Prince Frederick
- Manicurists & Pedicurists, Prince Frederick
- Manifold Business Forms Manufacturers, Prince Frederick
- Manufacturing, Prince Frederick
- Manufacturing Products, Prince Frederick
- Marriage & Family Counselors, Prince Frederick
- Marriage & Family Counselors Information & Referrals, Prince Frederick
- Masonry Contractors, Prince Frederick - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Prince Frederick
- Massage Therapists & Professional, Prince Frederick
- Massage Therapy, Prince Frederick
- Meat Market, Wholesale & Products, Prince Frederick
- Mechanical Contractors, Prince Frederick - Install, Service & Repair
- Medical & Dental Management, Prince Frederick
- Medical & Health Service Organizations, Prince Frederick
- Medical Diagnostic Clinics, Prince Frederick - Clinical Labs & Centers
- Medical Groups & Clinics, Prince Frederick - Medical & Health Centers
- Medical Supplies & Equipment, Prince Frederick
- Mental Health Specialists, Prince Frederick - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Prince Frederick - Iron Works
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- Methodist Church, Prince Frederick
- Mexican Restaurants, Prince Frederick
- Mildew Removal & Control, Prince Frederick - Mold Removal
- Millwork Contractors, Prince Frederick
- Mini & Self Storage, Prince Frederick
- Ministries Church, Prince Frederick
- Miscellaneous Household Item Repair, Prince Frederick
- Miscellaneous Government, Prince Frederick
- Miscellaneous Personal Services, Prince Frederick
- Miscellaneous Professional, Prince Frederick
- Mobile Home Parks & Communities , Prince Frederick
- Modular & Mobile Homes For Sale, Prince Frederick - Manufactured Homes Sale & Service
- Moisture & Vapor Control, Prince Frederick
- Mortgage Bankers & Correspondents, Prince Frederick
- Mortgage Contracts & Services, Prince Frederick
- Mortgages & Loans, Prince Frederick
- Motor Vehicle, Prince Frederick
- Motor Vehicle Rental & Leasing, Prince Frederick
- Movie Theaters, Prince Frederick
- Moving & Storage Supplies & Equipment, Prince Frederick
- Moving Companies, Prince Frederick
- Moving Services - Labor & Material, Prince Frederick
- Moving Supplies & Equipment Rental, Prince Frederick
- Moving Truck Rental , Prince Frederick
- Music, Prince Frederick
- Musical Instruments & Equipment Stores, Prince Frederick
- Musical Instruments Repair, Sales & Service, Prince Frederick
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