- Machine Shop & Tool Repair Service, Newbury
- Machinery And Equipment Manufacturers, Newbury
- Machinery, Supplies & Equipment - Business Production Related, Newbury
- Machinery, Supplies & Equipment - Construction & Contractor Related, Newbury
- Mail Delivery Service, Newbury
- Mailing, Delivery & Courier Service, Newbury
- Major Appliances, Newbury - Household & Kitchen
- Management Consultants & Services, Newbury
- Manufacturing, Newbury
- Manufacturing Products, Newbury
- Martial Arts & Self Defense Schools, Newbury
- Masonry Materials & Supplies, Newbury
- Meat Market, Wholesale & Products, Newbury
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- Metal Buildings, Newbury - Kits, Homes, Steel Buildings, etc
- Mini & Self Storage, Newbury
- Miscellaneous Government, Newbury
- Miscellaneous Personal Services, Newbury
- Miscellaneous Professional, Newbury
- Moldings Materials, Newbury
- Molds, Newbury
- Mortgage Bankers & Correspondents, Newbury
- Motion Picture Pre & Post Production Services, Newbury
- Motor Vehicle, Newbury
- Motorcycle Parts, Accessories & Dealers, Newbury
- Muffler Shop & Exhaust Systems, Newbury
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