- Machinery, Supplies & Equipment - Business Production Related, Houston
- Machinery, Supplies & Equipment - Business Supplies Related, Houston
- Machinery, Supplies & Equipment - Construction & Contractor Related, Houston
- Major Appliances, Houston - Household & Kitchen
- Management Consultants & Services, Houston
- Manufacturing, Houston
- Marriage & Family Counselors, Houston
- Masonry Materials & Supplies, Houston
- Men's Clothing Stores, Houston - Clothes & Accessories
- Merchandise Sales Events, Houston
- Methodist Church, Houston
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- Mini & Self Storage, Houston
- Miscellaneous Government, Houston
- Miscellaneous Personal Services, Houston
- Modular & Mobile Homes For Sale, Houston - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Houston
- Mortgage Bankers & Correspondents, Houston
- Motor Vehicle, Houston
- Motor Vehicle Rental & Leasing, Houston
- Movie Theaters, Houston
- Moving Supplies & Equipment Rental, Houston
- Moving Truck Rental , Houston
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