- Machine Shop & Tool Repair Service, Schertz
- Machinery And Equipment Manufacturers, Schertz
- Machinery Custom Design Manufacturers, Schertz
- Machinery Movers & Erectors, Schertz
- Machinery, Supplies & Equipment - Business Production Related, Schertz
- Machinery, Supplies & Equipment - Business Supplies Related, Schertz
- Machinery, Supplies & Equipment - Construction & Contractor Related, Schertz
- Mailbox Rental Services, Schertz
- Mailing, Delivery & Courier Service, Schertz
- Management Consultants & Services, Schertz
- Manicurists & Pedicurists, Schertz
- Manufacturing, Schertz
- Manufacturing Products, Schertz
- Marble, Schertz
- Marble & Terrazzo Flooring - Cleaning & Service, Schertz
- Martial Arts & Self Defense Schools, Schertz
- Masonry Contractors, Schertz - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Schertz
- Massage Therapists & Professional, Schertz
- Massage Therapy, Schertz
- Material Handling & Heavy Machinery & Equipment, Schertz
- Meat Market, Wholesale & Products, Schertz
- Mechanical Contractors, Schertz - Install, Service & Repair
- Medical & Infectious Waste Disposal, Schertz
- Medical Groups & Clinics, Schertz - Medical & Health Centers
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- Medical Supplies & Equipment, Schertz
- Medical Transcription Service, Schertz
- Membership Sports & Recreation Clubs, Schertz
- Merchandise Sales Events, Schertz
- Metal Buildings, Schertz - Kits, Homes, Steel Buildings, etc
- Metal Plating & Polishing, Schertz
- Methodist Church, Schertz
- Mexican Food, Schertz
- Mexican Restaurants, Schertz
- Military Supplies, Schertz
- Millwork Contractors, Schertz
- Mini & Self Storage, Schertz
- Miscellaneous Household Item Repair, Schertz
- Miscellaneous Agriculture, Schertz
- Miscellaneous Business Services, Schertz
- Miscellaneous Government, Schertz
- Miscellaneous Personal Services, Schertz
- Miscellaneous Professional, Schertz
- Mobile Home Parks & Communities , Schertz
- Motor Vehicle, Schertz
- Motor Vehicle Rental & Leasing, Schertz
- Moving & Storage Supplies & Equipment, Schertz
- Moving Companies, Schertz
- Moving Truck Rental , Schertz
- Mowing Service, Schertz
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