- Machine Shop & Tool Repair Service, Socorro
- Major Appliances, Socorro - Household & Kitchen
- Manicurists & Pedicurists, Socorro
- Manufactured & Mobile Home Movers & Transporting, Socorro
- Manufacturing, Socorro
- Manufacturing Products, Socorro
- Masonry Materials & Supplies, Socorro
- Membership Sports & Recreation Clubs, Socorro
- Men's & Boys Clothing & Accessories Stores, Socorro
- Mens & Boys Jeans & Western Wear Stores, Socorro
- Metal Repair Service & Blacksmith, Socorro - Iron Works
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- Mexican Restaurants, Socorro
- Millwork Contractors, Socorro
- Miscellaneous Government, Socorro
- Miscellaneous Personal Services, Socorro
- Miscellaneous Photographers, Socorro
- Mobile Home Parks & Communities , Socorro
- Modular & Mobile Homes For Sale, Socorro - Manufactured Homes Sale & Service
- Mortgages & Loans, Socorro
- Motor Vehicle, Socorro
- Motor Vehicle Rental & Leasing, Socorro
- Moving Truck Rental , Socorro
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