- Machine Shop & Tool Repair Service, Seguin
- Machinery, Supplies & Equipment - Business Production Related, Seguin
- Machinery, Supplies & Equipment - Business Supplies Related, Seguin
- Machinery, Supplies & Equipment - Construction & Contractor Related, Seguin
- Magazine & Newspaper Stands, Seguin - Dealers & Distributors
- Mailing, Delivery & Courier Service, Seguin
- Manufacturing, Seguin
- Marinas & Marina Services, Seguin
- Marine Supplies & Equipment, Seguin - Boat Supplies
- Marriage & Family Counselors, Seguin
- Masonry Contractors, Seguin - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Seguin
- Massage Therapists & Professional, Seguin
- Massage Therapy, Seguin
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- Massage Therapy Relaxation, Seguin
- Mental Health Specialists, Seguin - Psychologist, Psychiatrist, Psychotherapist, etc
- Mini & Self Storage, Seguin
- Miscellaneous Government, Seguin
- Miscellaneous Industry, Seguin
- Miscellaneous Personal Services, Seguin
- Miscellaneous Photographers, Seguin
- Miscellaneous Professional, Seguin
- Monuments, Tombstones, Markers & Memorials, Seguin
- Mortgage Bankers & Correspondents, Seguin
- Motor Vehicle, Seguin
- Motor Vehicle Rental & Leasing, Seguin
- Moving Companies, Seguin
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