- Machine Shop, Denver
- Machine Shop & Tool Repair Service, Denver
- Machinery, Supplies & Equipment - Business Production Related, Denver
- Machinery, Supplies & Equipment - Business Supplies Related, Denver
- Machinery, Supplies & Equipment - Construction & Contractor Related, Denver
- Mail Delivery Service, Denver
- Major Appliances, Denver - Household & Kitchen
- Management Consultants & Services, Denver
- Manicurists & Pedicurists, Denver
- Manufacturers Agents & Representatives, Denver
- Manufacturers Representative, Denver - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Denver
- Manufacturing Equipment & Supplies, Denver
- Manufacturing Products, Denver
- Marking, Stamping & Engraving Equipment, Denver
- Masonry Contractors, Denver - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Denver
- Meat Market, Wholesale & Products, Denver
- Mechanical Contractors, Denver - Install, Service & Repair
- Medical Research Facilities, Denver - Research & Development Centers
- Membership Sports & Recreation Clubs, Denver
- Men's & Boys Clothing & Accessories Stores, Denver
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- Mennonite Church, Denver
- Mens & Boys Hats, Gloves & Neckwear, Denver
- Merchandise Sales Events, Denver
- Metal Buildings, Denver - Wood Buildings
- Metal Repair Service & Blacksmith, Denver - Iron Works
- Methodist Church, Denver
- Millwork Contractors, Denver
- Mini & Self Storage, Denver
- Miscellaneous Agriculture, Denver
- Miscellaneous Government, Denver
- Miscellaneous Industry, Denver
- Miscellaneous Manufacturing, Denver
- Miscellaneous Personal Services, Denver
- Miscellaneous Professional, Denver
- Motor Vehicle, Denver
- Motor Vehicle Rental & Leasing, Denver
- Moving & Storage Supplies & Equipment, Denver
- Moving Companies, Denver
- Moving Supplies & Equipment Rental, Denver
- Moving Truck Rental , Denver
- Mulch, Peat & Moss Products, Denver
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