- Machinery, Supplies & Equipment - Business Production Related, Knowlton
- Machinery, Supplies & Equipment - Business Supplies Related, Knowlton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Knowlton
- Magazine & Newspaper Stands, Knowlton - Dealers & Distributors
- Major Appliances, Knowlton - Household & Kitchen
- Manufacturing, Knowlton
- Massage Therapy, Knowlton
- Material Handling Equipment, Knowlton - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Knowlton
- Medical Groups & Clinics, Knowlton - Medical & Health Centers
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- Medical Research Facilities, Knowlton - Research & Development Centers
- Membership Sports & Recreation Clubs, Knowlton
- Merchandise Sales Events, Knowlton
- Mini & Self Storage, Knowlton
- Miscellaneous Personal Services, Knowlton
- Miscellaneous Professional, Knowlton
- Motor Vehicle, Knowlton
- Motorcycle Parts, Accessories & Dealers, Knowlton
- Multimedia Publishers, Knowlton - Multimedia Services & Systems
- Museums, Knowlton
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