- Machine Shop, Pittsburg
- Machine Shop & Tool Repair Service, Pittsburg
- Machinery, Supplies & Equipment - Business Production Related, Pittsburg
- Machinery, Supplies & Equipment - Business Supplies Related, Pittsburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Pittsburg
- Mailbox Rental Services, Pittsburg
- Mailing, Delivery & Courier Service, Pittsburg
- Maintenance, Cleaning & Sanitation, Pittsburg
- Management Consultants & Services, Pittsburg
- Manicurists & Pedicurists, Pittsburg
- Manufacturing, Pittsburg
- Manufacturing Products, Pittsburg
- Marble, Pittsburg
- Marine Electronic Equipment, Pittsburg
- Marine Supplies & Equipment, Pittsburg - Boat Supplies
- Marriage & Family Counselors, Pittsburg
- Martial Arts & Self Defense Schools, Pittsburg
- Masonry Contractors, Pittsburg - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Pittsburg
- Massage Therapy, Pittsburg
- Maternity Clothes & Clothing Stores, Pittsburg - Maternity Dress, Gown, Swimwear, Underwear & More
- Mats & Matting, Pittsburg
- Meat Market, Wholesale & Products, Pittsburg
- Medical Billing Services, Pittsburg
- Medical Diagnostic Imaging, Pittsburg
- Medical Groups & Clinics, Pittsburg - Medical & Health Centers
- Medical Supplies & Equipment, Pittsburg
- Meeting & Event Planning Services, Pittsburg - Conference Consultants
- Membership Sports & Recreation Clubs, Pittsburg
- Men's Clothing Stores, Pittsburg - Clothes & Accessories
- Mental Health Clinics, Pittsburg - Treatment Centers
- Mental Health Specialists, Pittsburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Coating & Allied Services, Pittsburg
- Metal Repair Service & Blacksmith, Pittsburg - Iron Works
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- Metal Tanks, Pittsburg
- Methodist Church, Pittsburg
- Mexican Restaurants, Pittsburg
- Middle Eastern Restaurants, Pittsburg
- Mini & Self Storage, Pittsburg
- Mining, Pittsburg
- Ministries Church, Pittsburg
- Miscellaneous Household Item Repair, Pittsburg
- Miscellaneous Business Services, Pittsburg
- Miscellaneous Government, Pittsburg
- Miscellaneous Industry, Pittsburg
- Miscellaneous Personal Services, Pittsburg
- Miscellaneous Photographers, Pittsburg
- Miscellaneous Professional, Pittsburg
- Mobile Home Parks & Communities , Pittsburg
- Mobile Homes for Rent & Lease, Pittsburg
- Mortgage Bankers & Correspondents, Pittsburg
- Mortgage Companies, Pittsburg
- Mortgages & Loans, Pittsburg
- Motion Picture Casting Services, Pittsburg
- Motion Picture Personnel Services, Pittsburg
- Motor Vehicle, Pittsburg
- Motor Vehicle Rental & Leasing, Pittsburg
- Motorcycle Parts, Accessories & Dealers, Pittsburg
- Movie Theaters, Pittsburg
- Moving & Storage Supplies & Equipment, Pittsburg
- Moving Companies, Pittsburg
- Moving Services - Labor & Material, Pittsburg
- Moving Supplies & Equipment Rental, Pittsburg
- Moving Truck Rental , Pittsburg
- Muffler Shop & Exhaust Systems, Pittsburg
- Museums, Pittsburg
- Music, Pittsburg
- Musical Instruments Repair, Sales & Service, Pittsburg
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