- Machine Shop & Tool Repair Service, Spearfish
- Machinery, Supplies & Equipment - Business Production Related, Spearfish
- Machinery, Supplies & Equipment - Business Supplies Related, Spearfish
- Machinery, Supplies & Equipment - Construction & Contractor Related, Spearfish
- Mailbox Rental Services, Spearfish
- Mailing, Delivery & Courier Service, Spearfish
- Maintenance, Cleaning & Sanitation, Spearfish
- Major Appliances, Spearfish - Household & Kitchen
- Malls & Shopping Centers, Spearfish
- Management Consultants & Services, Spearfish
- Manicurists & Pedicurists, Spearfish
- Manifold Business Forms Manufacturers, Spearfish
- Manufacturing, Spearfish
- Marine Supplies & Equipment, Spearfish - Boat Supplies
- Marriage & Family Counselors, Spearfish
- Masonry Materials & Supplies, Spearfish
- Massage Therapists & Professional, Spearfish
- Massage Therapy, Spearfish
- Meat Market, Wholesale & Products, Spearfish
- Mechanical Contractors, Spearfish - Install, Service & Repair
- Medical Alert Systems, Spearfish - Medical Alarms - PERS
- Medical Equipment Manufacturers, Spearfish
- Medical Supplies & Equipment, Spearfish
- Membership Sports & Recreation Clubs, Spearfish
- Men's & Boys Clothing & Accessories Stores, Spearfish
- Mens & Boys Jeans & Western Wear Stores, Spearfish
- Mental Health Specialists, Spearfish - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Spearfish - Iron Works
- Methodist Church, Spearfish
- Mexican Food, Spearfish
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- Mexican Restaurants, Spearfish
- Mildew Removal & Control, Spearfish - Mold Removal
- Mini Golf Courses, Spearfish
- Mining, Spearfish
- Mirrors, Spearfish - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Spearfish
- Miscellaneous Agriculture, Spearfish
- Miscellaneous Government, Spearfish
- Miscellaneous Industry, Spearfish
- Miscellaneous Personal Services, Spearfish
- Miscellaneous Photographers, Spearfish
- Miscellaneous Professional, Spearfish
- Mobile Home Contractors, Spearfish
- Mobile Home Improvements & Repairs, Spearfish
- Mobile Home Parks & Communities , Spearfish
- Mortgage Bankers & Correspondents, Spearfish
- Mortgage Contracts & Services, Spearfish
- Mortgages & Loans, Spearfish
- Motion Picture Pre & Post Production Services, Spearfish
- Motor Vehicle, Spearfish
- Motor Vehicle Rental & Leasing, Spearfish
- Motorcycle & ATV Repair & Service, Spearfish
- Motorcycle Parts, Accessories & Dealers, Spearfish
- Motorcycle Repair & Service, Spearfish
- Movie Theaters, Spearfish
- Moving & Storage Supplies & Equipment, Spearfish
- Moving Supplies & Equipment Rental, Spearfish
- Moving Truck Rental , Spearfish
- Muffler Shop & Exhaust Systems, Spearfish
- Museums, Spearfish
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