- Machine Shop & Tool Repair Service, Manassas Park
- Machinery, Supplies & Equipment - Business Supplies Related, Manassas Park
- Machinery, Supplies & Equipment - Construction & Contractor Related, Manassas Park
- Mailing, Delivery & Courier Service, Manassas Park
- Maintenance, Cleaning & Sanitation, Manassas Park
- Major Appliances, Manassas Park - Household & Kitchen
- Management Consultants & Services, Manassas Park
- Manicurists & Pedicurists, Manassas Park
- Manufacturing, Manassas Park
- Manufacturing Products, Manassas Park
- Masonry Contractors, Manassas Park - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Manassas Park
- Mechanical Contractors, Manassas Park - Install, Service & Repair
- Meeting & Event Planning Services, Manassas Park - Conference Consultants
- Metal Finishers, Manassas Park
- Metal Plating & Polishing, Manassas Park
- Metal Repair Service & Blacksmith, Manassas Park - Iron Works
- Mexican Restaurants, Manassas Park
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- Mini & Self Storage, Manassas Park
- Mining, Manassas Park
- Miscellaneous Household Item Repair, Manassas Park
- Miscellaneous Agriculture, Manassas Park
- Miscellaneous Government, Manassas Park
- Miscellaneous Manufacturing, Manassas Park
- Miscellaneous Personal Services, Manassas Park
- Miscellaneous Professional, Manassas Park
- Mission Churches, Manassas Park
- Mosques, Manassas Park
- Motor Vehicle, Manassas Park
- Motor Vehicle Rental & Leasing, Manassas Park
- Motorcycle Parts, Accessories & Dealers, Manassas Park
- Moving Companies, Manassas Park
- Moving Supplies & Equipment Rental, Manassas Park
- Moving Truck Rental , Manassas Park
- Muffler Shop & Exhaust Systems, Manassas Park
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