- Machine Shop, Northglenn
- Machine Shop & Tool Repair Service, Northglenn
- Machine Tools , Northglenn
- Machinery Repair & Rebuild, Northglenn
- Machinery, Supplies & Equipment - Business Production Related, Northglenn
- Machinery, Supplies & Equipment - Business Supplies Related, Northglenn
- Malls & Shopping Centers, Northglenn
- Management Consultants & Services, Northglenn
- Manicurists & Pedicurists, Northglenn
- Manufactured & Mobile Home Movers & Transporting, Northglenn
- Manufacturers Agents & Representatives, Northglenn
- Manufacturers Representative, Northglenn - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Northglenn
- Manufacturing Products, Northglenn
- Marriage & Family Counselors, Northglenn
- Martial Arts & Self Defense Schools, Northglenn
- Masonry Materials & Supplies, Northglenn
- Massage Therapists & Professional, Northglenn
- Massage Therapy, Northglenn
- Meat Market, Wholesale & Products, Northglenn
- Mechanical Contractors, Northglenn - Install, Service & Repair
- Medical & Dental Management, Northglenn
- Medical Diagnostic Clinics, Northglenn - Clinical Labs & Centers
- Medical Groups & Clinics, Northglenn - Medical & Health Centers
- Medical Management & Business Administration Service, Northglenn
- Medical Records Service , Northglenn
- Medical Supplies & Equipment, Northglenn
- Medical Transcription Service, Northglenn
- Membership Sports & Recreation Clubs, Northglenn
- Men's & Boys Clothing & Accessories Stores, Northglenn
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- Mens & Boys Jeans & Western Wear Stores, Northglenn
- Mental & Developmental Information & Referral Services, Northglenn
- Mental Health Specialists, Northglenn - Psychologist, Psychiatrist, Psychotherapist, etc
- Metals, Northglenn
- Methodist Church, Northglenn
- Mexican Restaurants, Northglenn
- Minerals, Northglenn
- Mini & Self Storage, Northglenn
- Miscellaneous Business Product Repair, Northglenn
- Miscellaneous Household Item Repair, Northglenn
- Miscellaneous Agriculture, Northglenn
- Miscellaneous Business Services, Northglenn
- Miscellaneous Government, Northglenn
- Miscellaneous Manufacturing, Northglenn
- Miscellaneous Personal Services, Northglenn
- Miscellaneous Photographers, Northglenn
- Miscellaneous Professional, Northglenn
- Money Transfer Service, Northglenn
- Mortgage Bankers & Correspondents, Northglenn
- Mortgage Brokers, Northglenn
- Mortgage Companies, Northglenn
- Mortgage Contracts & Services, Northglenn
- Mortgage Feasibility Consultants, Northglenn
- Mortgages & Loans, Northglenn
- Motor Vehicle, Northglenn
- Motor Vehicle Rental & Leasing, Northglenn
- Moving Supplies & Equipment Rental, Northglenn
- Moving Truck Rental , Northglenn
- Muffler Shop & Exhaust Systems, Northglenn
- Music, Northglenn
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