- Machinery Repair & Rebuild, Walker
- Machinery, Supplies & Equipment - Business Supplies Related, Walker
- Machinery, Supplies & Equipment - Construction & Contractor Related, Walker
- Mail Delivery Service, Walker
- Major Appliances, Walker - Household & Kitchen
- Management Consultants & Services, Walker
- Manufactured & Mobile Home Movers & Transporting, Walker
- Manufacturing, Walker
- Marine Supplies & Equipment, Walker - Boat Supplies
- Masonry Materials & Supplies, Walker
- Massage Therapists & Professional, Walker
- Massage Therapy, Walker
- Membership Sports & Recreation Clubs, Walker
- Men's Clothing Stores, Walker - Clothes & Accessories
- Metal Repair Service & Blacksmith, Walker - Iron Works
- Mexican Restaurants, Walker
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- Miscellaneous Business Product Repair, Walker
- Miscellaneous Agriculture, Walker
- Miscellaneous Government, Walker
- Miscellaneous Industry, Walker
- Miscellaneous Personal Services, Walker
- Mobile Home Contractors, Walker
- Mobile Home Improvements & Repairs, Walker
- Mobile Home Parks & Communities , Walker
- Modular & Mobile Homes For Sale, Walker - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Walker
- Mortgage Bankers & Correspondents, Walker
- Mortgage Contracts & Services, Walker
- Motor Vehicle, Walker
- Motor Vehicle Rental & Leasing, Walker
- Moving Supplies & Equipment Rental, Walker
- Moving Truck Rental , Walker
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