- Machine Shop & Tool Repair Service, Williamsburg
- Machinery, Supplies & Equipment - Business Production Related, Williamsburg
- Machinery, Supplies & Equipment - Business Supplies Related, Williamsburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Williamsburg
- Major Appliances, Williamsburg - Household & Kitchen
- Management Consultants & Services, Williamsburg
- Manufacturing, Williamsburg
- Manufacturing Products, Williamsburg
- Marinas & Marina Services, Williamsburg
- Marine Products And Services, Williamsburg
- Marine Repair & Service Stations, Williamsburg
- Marine Supplies & Equipment Repair, Williamsburg - Boat Supplies & Equipment
- Marriage & Family Counselors, Williamsburg
- Masonry Contractors, Williamsburg - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Williamsburg
- Medical Diagnostic Clinics, Williamsburg - Clinical Labs & Centers
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- Membership Sports & Recreation Clubs, Williamsburg
- Mental Health Clinics, Williamsburg - Treatment Centers
- Mental Health Specialists, Williamsburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Williamsburg
- Mexican Restaurants, Williamsburg
- Millwork Manufacturers, Williamsburg
- Miscellaneous Business Product Repair, Williamsburg
- Miscellaneous Government, Williamsburg
- Miscellaneous Personal Services, Williamsburg
- Miscellaneous Professional, Williamsburg
- Mosquito Control, Williamsburg
- Motor Vehicle, Williamsburg
- Museums, Williamsburg
- Music, Williamsburg
- Musical Instruments & Equipment Stores, Williamsburg
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