- Machine Shop & Tool Repair Service, South Elgin
- Machine Tool Repair & Rebuild, South Elgin
- Machine Tools , South Elgin
- Machinery And Equipment Manufacturers, South Elgin
- Machinery Repair & Rebuild, South Elgin
- Machinery, Supplies & Equipment - Business Production Related, South Elgin
- Machinery, Supplies & Equipment - Business Supplies Related, South Elgin
- Machinery, Supplies & Equipment - Construction & Contractor Related, South Elgin
- Maintenance, Cleaning & Sanitation, South Elgin
- Major Appliances, South Elgin - Household & Kitchen
- Make Up & Cosmetics Application, South Elgin
- Management Consultants & Services, South Elgin
- Manicurists & Pedicurists, South Elgin
- Manifold Business Forms Manufacturers, South Elgin
- Manufacturers Agents & Representatives, South Elgin
- Manufacturers Representative, South Elgin - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, South Elgin
- Manufacturing Products, South Elgin
- Marble, South Elgin
- Marriage & Family Counselors, South Elgin
- Martial Arts & Self Defense Schools, South Elgin
- Masonry Materials & Supplies, South Elgin
- Massage Therapists & Professional, South Elgin
- Massage Therapy, South Elgin
- Material Handling Equipment, South Elgin - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Brokers, South Elgin
- Meat Market, Wholesale & Products, South Elgin
- Medical & Health Service Organizations, South Elgin
- Medical Diagnostic Clinics, South Elgin - Clinical Labs & Centers
- Medical Supplies & Equipment, South Elgin
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- Metal Heat Treating, South Elgin
- Metal Repair Service & Blacksmith, South Elgin - Iron Works
- Metal Specialties, South Elgin
- Metal Stampings Manufacturers, South Elgin
- Methodist Church, South Elgin
- Mexican & Latin American Goods & Products Stores, South Elgin
- Mexican Restaurants, South Elgin
- Mildew Removal & Control, South Elgin - Mold Removal
- Military Supplies, South Elgin
- Miscellaneous Household Item Repair, South Elgin
- Miscellaneous Agriculture, South Elgin
- Miscellaneous Government, South Elgin
- Miscellaneous Manufacturing, South Elgin
- Miscellaneous Metal Work Manufacturers, South Elgin
- Miscellaneous Personal Services, South Elgin
- Miscellaneous Professional, South Elgin
- Modular & Mobile Homes For Sale, South Elgin - Manufactured Homes Sale & Service
- Moldings Materials, South Elgin
- Molds, South Elgin
- Mortgage Bankers & Correspondents, South Elgin
- Motor Vehicle, South Elgin
- Motor Vehicle Rental & Leasing, South Elgin
- Moving Companies, South Elgin
- Moving Services - Labor & Material, South Elgin
- Moving Truck Rental , South Elgin
- Muffler Shop & Exhaust Systems, South Elgin
- Museums, South Elgin
- Music, South Elgin
- Music Lessons, South Elgin
- Music Lessons - Instrumental, South Elgin
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