- Machine Shop, Manassas
- Machine Shop & Tool Repair Service, Manassas
- Machinery, Supplies & Equipment - Business Production Related, Manassas
- Machinery, Supplies & Equipment - Business Supplies Related, Manassas
- Machinery, Supplies & Equipment - Construction & Contractor Related, Manassas
- Mail Order Fulfillment Service, Manassas
- Mailbox Rental Services, Manassas
- Mailboxes Retail, Manassas
- Mailing List Service, Brokers & Compilers, Manassas
- Mailing, Delivery & Courier Service, Manassas
- Maintenance, Cleaning & Sanitation, Manassas
- Major Appliances, Manassas - Household & Kitchen
- Malls & Shopping Centers, Manassas
- Malpractice Attorneys & Lawyers, Manassas
- Management Consultants & Services, Manassas
- Manicurists & Pedicurists, Manassas
- Manufacturing, Manassas
- Manufacturing Equipment & Supplies, Manassas
- Manufacturing Products, Manassas
- Marine Contractors & Designers, Manassas
- Marine Products And Services, Manassas
- Marine Repair & Service Stations, Manassas
- Marine Supplies & Equipment Repair, Manassas - Boat Supplies & Equipment
- Market Research & Analysis , Manassas - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Manassas
- Marriage Certificates, Manassas
- Martial Arts & Self Defense Schools, Manassas
- Masonry Contractors, Manassas - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Manassas
- Masonry Panels Prefabricated, Manassas
- Mass Transit Vehicle Dealers, Manassas
- Massage Therapists & Professional, Manassas
- Massage Therapy, Manassas
- Material Handling & Heavy Machinery & Equipment, Manassas
- Mats & Matting, Manassas
- Maytag Appliances, Manassas
- Meat Market, Wholesale & Products, Manassas
- Meat Packers, Manassas
- Mechanical Contractors, Manassas - Install, Service & Repair
- Mechanical Engineer, Manassas - Mechanical Engineering Service
- Medical & Dental Assistant Schools, Manassas
- Medical & Dental Management, Manassas
- Medical & Health Service Organizations, Manassas
- Medical Billing Services, Manassas
- Medical Claims Processing & Assistance, Manassas
- Medical Diagnostic Clinics, Manassas - Clinical Labs & Centers
- Medical Equipment & Supplies Rental & Leasing, Manassas
- Medical Equipment Manufacturers, Manassas
- Medical Groups & Clinics, Manassas - Medical & Health Centers
- Medical Management & Business Administration Service, Manassas
- Medical Massage, Manassas
- Medical Research Facilities, Manassas - Research & Development Centers
- Medical Supplies & Equipment, Manassas
- Meeting & Event Planning Services, Manassas - Conference Consultants
- Membership Sports & Recreation Clubs, Manassas
- Men's Clothing Stores, Manassas - Clothes & Accessories
- Mental & Developmental Information & Referral Services, Manassas
- Mental Health Specialists, Manassas - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Manassas
- Merchandising & Pricing Equipment, Manassas
- Metal Buildings, Manassas - Kits, Homes, Steel Buildings, etc
- Metal Buyers, Manassas
- Metal Coating & Allied Services, Manassas
- Metal Detecting Equipment, Manassas
- Metal Products, Manassas
- Metal Repair Service & Blacksmith, Manassas - Iron Works
- Metal Services, Manassas
- Metal Specialties, Manassas
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- Metal Tablets, Manassas
- Metaphysical Churches, Manassas
- Methodist Church, Manassas
- Mexican Restaurants, Manassas
- Micro Breweries, Manassas
- Middle Eastern Restaurants, Manassas
- Midget Automobile Racing, Manassas
- Mildew Removal & Control, Manassas - Mold Removal
- Minerals, Manassas
- Mini & Self Storage, Manassas
- Mining, Manassas
- Ministers, Manassas
- Ministries Church, Manassas
- Mirrors, Manassas - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Manassas
- Miscellaneous Household Item Repair, Manassas
- Miscellaneous Agriculture, Manassas
- Miscellaneous Business Services, Manassas
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Manassas
- Miscellaneous Government, Manassas
- Miscellaneous Industry, Manassas
- Miscellaneous Manufacturing, Manassas
- Miscellaneous Motor Vehicles, Manassas
- Miscellaneous Personal Services, Manassas
- Miscellaneous Photographers, Manassas
- Miscellaneous Professional, Manassas
- Mission Churches, Manassas
- Mobile Home Parks & Communities , Manassas
- Modular & Mobile Homes For Sale, Manassas - Manufactured Homes Sale & Service
- Moisture & Vapor Control, Manassas
- Money Transfer Service, Manassas
- Monuments, Tombstones, Markers & Memorials, Manassas
- Mortgage Bankers & Correspondents, Manassas
- Mortgage Companies, Manassas
- Mortgage Contracts & Services, Manassas
- Mortgages & Loans, Manassas
- Mortgages Commercial & Industrial, Manassas
- Mosques, Manassas
- Motion Picture & Television Production Services, Manassas
- Motion Picture Pre & Post Production Services, Manassas
- Motor Homes, Manassas
- Motor Vehicle, Manassas
- Motor Vehicle Rental & Leasing, Manassas
- Motorcycle & ATV Repair & Service, Manassas
- Motorcycle & Motor Scooters Dealers, Repair & Service, Manassas
- Motorcycle Parts, Accessories & Dealers, Manassas
- Motorcycle Repair & Service, Manassas
- Motorcycles Paint & Refinishing, Manassas
- Movie Theaters, Manassas
- Moving & Storage Consultants, Manassas
- Moving & Storage Supplies & Equipment, Manassas
- Moving Companies, Manassas
- Moving Services - Labor & Material, Manassas
- Moving Supplies & Equipment Rental, Manassas
- Moving Truck Rental , Manassas
- Mowing Service, Manassas
- Muffler Shop & Exhaust Systems, Manassas
- Multimedia Publishers, Manassas - Multimedia Services & Systems
- Museums, Manassas
- Music, Manassas
- Music Lessons, Manassas
- Music Lessons - Instrumental, Manassas
- Musical Instrument Manufacturers, Manassas
- Musical Instrument Rental, Manassas - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Manassas
- Musical Instruments Repair, Sales & Service, Manassas
- Musical Recording Services, Manassas
- Muslim Church, Manassas
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