- Machine Shop & Tool Repair Service, Pittsburg
- Machinery, Supplies & Equipment - Business Supplies Related, Pittsburg
- Management Consultants & Services, Pittsburg
- Manicurists & Pedicurists, Pittsburg
- Manufacturing, Pittsburg
- Manufacturing Products, Pittsburg
- Marinas & Marina Services, Pittsburg
- Martial Arts & Self Defense Schools, Pittsburg
- Meat Market, Wholesale & Products, Pittsburg
- Men's & Boys Clothing & Accessories Stores, Pittsburg
- Mens & Boys Belts & Suspenders, Pittsburg
- Methodist Church, Pittsburg
- Mexican Restaurants, Pittsburg
- Mining, Pittsburg
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- Ministries Church, Pittsburg
- Miscellaneous Agriculture, Pittsburg
- Miscellaneous Business Services, Pittsburg
- Miscellaneous Government, Pittsburg
- Miscellaneous Photographers, Pittsburg
- Miscellaneous Professional, Pittsburg
- Mission Churches, Pittsburg
- Monuments, Tombstones, Markers & Memorials, Pittsburg
- Mortgage Bankers & Correspondents, Pittsburg
- Mortgage Companies, Pittsburg
- Motor Vehicle, Pittsburg
- Motor Vehicle Rental & Leasing, Pittsburg
- Moving Truck Rental , Pittsburg
- Museums, Pittsburg
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