- Machinery, Supplies & Equipment - Business Production Related, Idaho Springs
- Machinery, Supplies & Equipment - Business Supplies Related, Idaho Springs
- Malls & Shopping Centers, Idaho Springs
- Management Consultants & Services, Idaho Springs
- Manufacturing, Idaho Springs
- Marriage & Family Counselors, Idaho Springs
- Masonry Materials & Supplies, Idaho Springs
- Massage Therapists & Professional, Idaho Springs
- Massage Therapy, Idaho Springs
- Membership Sports & Recreation Clubs, Idaho Springs
- Men's Clothing Stores, Idaho Springs - Clothes & Accessories
- Mental Health Specialists, Idaho Springs - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Idaho Springs
- Mexican Restaurants, Idaho Springs
- Mining, Idaho Springs
- Mining Contractors, Idaho Springs - Mining Companies, Contractors & Brokers
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- Mining Services, Idaho Springs
- Mining, Crude-Oil Production, Idaho Springs - Mining Companies
- Miscellaneous Household Item Repair, Idaho Springs
- Miscellaneous Retail Stores, Idaho Springs
- Miscellaneous Government, Idaho Springs
- Miscellaneous Personal Services, Idaho Springs
- Miscellaneous Photographers, Idaho Springs
- Miscellaneous Professional, Idaho Springs
- Mortgage Bankers & Correspondents, Idaho Springs
- Mortgage Contracts & Services, Idaho Springs
- Motor Vehicle, Idaho Springs
- Motor Vehicle Rental & Leasing, Idaho Springs
- Moving Supplies & Equipment Rental, Idaho Springs
- Moving Truck Rental , Idaho Springs
- Museums, Idaho Springs
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