- Machine Shop & Tool Repair Service, Fort Lupton
- Machinery, Supplies & Equipment - Business Production Related, Fort Lupton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Fort Lupton
- Management Consultants & Services, Fort Lupton
- Manicurists & Pedicurists, Fort Lupton
- Manufacturing, Fort Lupton
- Marriage & Family Counselors, Fort Lupton
- Masonry Materials & Supplies, Fort Lupton
- Meat Market, Wholesale & Products, Fort Lupton
- Medical Groups & Clinics, Fort Lupton - Medical & Health Centers
- Medical Supplies & Equipment, Fort Lupton
- Mental Health Specialists, Fort Lupton - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Fort Lupton
- Metal Repair Service & Blacksmith, Fort Lupton - Iron Works
- Metal Tanks, Fort Lupton
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- Methodist Church, Fort Lupton
- Mexican Food, Fort Lupton
- Mexican Restaurants, Fort Lupton
- Mining, Fort Lupton
- Miscellaneous Household Item Repair, Fort Lupton
- Miscellaneous Business Services, Fort Lupton
- Miscellaneous Government, Fort Lupton
- Miscellaneous Professional, Fort Lupton
- Mobile Home Parks & Communities , Fort Lupton
- Mortgage Bankers & Correspondents, Fort Lupton
- Mortgage Contracts & Services, Fort Lupton
- Motor Vehicle, Fort Lupton
- Motor Vehicle Rental & Leasing, Fort Lupton
- Museums, Fort Lupton
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