- Machine Shop & Tool Repair Service, Williams Lake
- Machinery Repair & Rebuild, Williams Lake
- Machinery, Supplies & Equipment - Business Production Related, Williams Lake
- Machinery, Supplies & Equipment - Business Supplies Related, Williams Lake
- Machinery, Supplies & Equipment - Construction & Contractor Related, Williams Lake
- Magazine & Newspaper Stands, Williams Lake - Dealers & Distributors
- Mail Delivery Service, Williams Lake
- Mailing, Delivery & Courier Service, Williams Lake
- Major Appliances, Williams Lake - Household & Kitchen
- Malls & Shopping Centers, Williams Lake
- Management Consultants & Services, Williams Lake
- Manufactured & Mobile Home Movers & Transporting, Williams Lake
- Manufacturing, Williams Lake
- Manufacturing Products, Williams Lake
- Map Publishers & Printers, Williams Lake
- Mapping & Topographical Services, Williams Lake
- Martial Arts & Self Defense Schools, Williams Lake
- Masonry Materials & Supplies, Williams Lake
- Massage Therapists & Professional, Williams Lake
- Massage Therapy, Williams Lake
- Meat Market, Wholesale & Products, Williams Lake
- Meat Packers, Williams Lake
- Medical Alert Systems, Williams Lake - Medical Alarms - PERS
- Medical Identification Jewelry, Williams Lake
- Medical Supplies & Equipment, Williams Lake
- Membership Sports & Recreation Clubs, Williams Lake
- Men's & Boys Clothing & Accessories Stores, Williams Lake
- Men's Clothing Stores, Williams Lake - Clothes & Accessories
- Mennonite Church, Williams Lake
- Mens & Boys Jeans & Western Wear Stores, Williams Lake
- Mental Health Specialists, Williams Lake - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Williams Lake
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- Metal Repair Service & Blacksmith, Williams Lake - Iron Works
- Mini Golf Courses, Williams Lake
- Mining, Williams Lake
- Mining Contractors, Williams Lake - Mining Companies, Contractors & Brokers
- Mining Development & Exploration, Williams Lake
- Mining Equipment & Supplies, Williams Lake
- Mining Services, Williams Lake
- Mining, Crude-Oil Production, Williams Lake - Mining Companies
- Mirrors, Williams Lake - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Agriculture, Williams Lake
- Miscellaneous Business Services, Williams Lake
- Miscellaneous Government, Williams Lake
- Miscellaneous Industry, Williams Lake
- Miscellaneous Personal Services, Williams Lake
- Miscellaneous Professional, Williams Lake
- Mobile Home Parks & Communities , Williams Lake
- Modular & Mobile Homes For Sale, Williams Lake - Manufactured Homes Sale & Service
- Money Transfer Service, Williams Lake
- Monuments, Tombstones, Markers & Memorials, Williams Lake
- Mortgage Bankers & Correspondents, Williams Lake
- Motor Vehicle, Williams Lake
- Motor Vehicle Rental & Leasing, Williams Lake
- Motorcycle & ATV Repair & Service, Williams Lake
- Motorcycle Parts, Accessories & Dealers, Williams Lake
- Motorcycle Repair & Service, Williams Lake
- Movie Theaters, Williams Lake
- Moving Companies, Williams Lake
- Moving Truck Rental , Williams Lake
- Muffler Shop & Exhaust Systems, Williams Lake
- Museums, Williams Lake
- Music, Williams Lake
- Musical Instruments & Equipment Stores, Williams Lake
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