- Machine Shop, Williams
- Machine Shop & Tool Repair Service, Williams
- Machinery, Supplies & Equipment - Business Production Related, Williams
- Machinery, Supplies & Equipment - Construction & Contractor Related, Williams
- Manufacturing, Williams
- Masonry Materials & Supplies, Williams
- Membership Sports & Recreation Clubs, Williams
- Merchandise Sales Events, Williams
- Metal Buildings, Williams - Kits, Homes, Steel Buildings, etc
- Methodist Church, Williams
- Mexican Restaurants, Williams
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- Mini & Self Storage, Williams
- Miscellaneous Business Services, Williams
- Miscellaneous Government, Williams
- Miscellaneous Personal Services, Williams
- Mortgages & Loans, Williams
- Motor Vehicle, Williams
- Muffler & Exhaust Systems Wholesale, Williams
- Muffler Shop & Exhaust Systems, Williams
- Mufflers & Exhaust Systems Manufacturers, Williams
- Museums, Williams
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