- Machine Shop, Westwego
- Machine Shop & Tool Repair Service, Westwego
- Machinery, Supplies & Equipment - Business Production Related, Westwego
- Machinery, Supplies & Equipment - Business Supplies Related, Westwego
- Machinery, Supplies & Equipment - Construction & Contractor Related, Westwego
- Mailboxes Retail, Westwego
- Management Consultants & Services, Westwego
- Manicurists & Pedicurists, Westwego
- Manufacturing, Westwego
- Manufacturing Products, Westwego
- Marine Electronic Equipment, Westwego
- Marine Supplies & Equipment, Westwego - Boat Supplies
- Marsh Buggies, Westwego
- Masonry Contractors, Westwego - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Westwego
- Material Handling & Heavy Machinery & Equipment, Westwego
- Meat Market, Wholesale & Products, Westwego
- Mechanical Contractors, Westwego - Install, Service & Repair
- Medical Supplies & Equipment, Westwego
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- Men's Clothing Stores, Westwego - Clothes & Accessories
- Metal Buildings, Westwego - Kits, Homes, Steel Buildings, etc
- Metal Distributors, Westwego
- Metal Repair Service & Blacksmith, Westwego - Iron Works
- Mexican Restaurants, Westwego
- Mini & Self Storage, Westwego
- Miscellaneous Government, Westwego
- Miscellaneous Personal Services, Westwego
- Miscellaneous Photographers, Westwego
- Miscellaneous Professional, Westwego
- Modular & Mobile Homes For Sale, Westwego - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Westwego
- Motor Vehicle, Westwego
- Motor Vehicle Rental & Leasing, Westwego
- Movie Theaters, Westwego
- Moving & Storage Supplies & Equipment, Westwego
- Moving Supplies & Equipment Rental, Westwego
- Moving Truck Rental , Westwego
- Museums, Westwego
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