- Machine Shop, Port Richey
- Machine Shop & Tool Repair Service, Port Richey
- Machinery, Supplies & Equipment - Business Production Related, Port Richey
- Machinery, Supplies & Equipment - Business Supplies Related, Port Richey
- Machinery, Supplies & Equipment - Construction & Contractor Related, Port Richey
- Mailbox Rental Services, Port Richey
- Mailing, Delivery & Courier Service, Port Richey
- Maintenance, Cleaning & Sanitation, Port Richey
- Major Appliances, Port Richey - Household & Kitchen
- Malpractice Attorneys & Lawyers, Port Richey
- Malpractice Lawyers & Attorneys, Port Richey
- Management Consultants & Services, Port Richey
- Manicurists & Pedicurists, Port Richey
- Manufacturing, Port Richey
- Manufacturing Products, Port Richey
- Marble, Port Richey
- Marble Contractors, Port Richey - Installation, Cleaning & Removal Services
- Marinas & Aquariums, Port Richey
- Marinas & Marina Services, Port Richey
- Marine Contractors & Designers, Port Richey
- Marine Products And Services, Port Richey
- Marine Repair & Service Stations, Port Richey
- Marine Supplies & Equipment - Boat Engine & Drive Train Repair, Port Richey
- Marine Supplies & Equipment Repair, Port Richey - Boat Supplies & Equipment
- Marriage & Family Counselors, Port Richey
- Martial Arts & Self Defense Schools, Port Richey
- Masonry Contractors, Port Richey - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Port Richey
- Massage Therapists & Professional, Port Richey
- Massage Therapy, Port Richey
- Meat Cutting Services, Port Richey
- Meat Market, Wholesale & Products, Port Richey
- Medical Supplies & Equipment, Port Richey
- Men's Clothing Stores, Port Richey - Clothes & Accessories
- Mental Health Specialists, Port Richey - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Port Richey
- Metal Coating & Allied Services, Port Richey
- Metal Cutting Services, Port Richey
- Metal Finishers, Port Richey
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- Metal Plating & Polishing, Port Richey
- Metal Repair Service & Blacksmith, Port Richey - Iron Works
- Metaphysical Churches, Port Richey
- Mexican Restaurants, Port Richey
- Mildew Removal & Control, Port Richey - Mold Removal
- Millwork Contractors, Port Richey
- Mini & Self Storage, Port Richey
- Mini Golf Courses, Port Richey
- Mining, Port Richey
- Miscellaneous Business Product Repair, Port Richey
- Miscellaneous Household Item Repair, Port Richey
- Miscellaneous Government, Port Richey
- Miscellaneous Industry, Port Richey
- Miscellaneous Manufacturing, Port Richey
- Miscellaneous Personal Services, Port Richey
- Miscellaneous Photographers, Port Richey
- Miscellaneous Professional, Port Richey
- Mobile Home Parks & Communities , Port Richey
- Mortgage Bankers & Correspondents, Port Richey
- Mortgage Companies, Port Richey
- Mortgages & Loans, Port Richey
- Motor Vehicle, Port Richey
- Motor Vehicle Rental & Leasing, Port Richey
- Motorcycle & ATV Repair & Service, Port Richey
- Motorcycle & Motor Scooters Dealers, Repair & Service, Port Richey
- Motorcycle Parts, Accessories & Dealers, Port Richey
- Motorcycle Repair & Service, Port Richey
- Movie Theaters, Port Richey
- Moving & Storage Supplies & Equipment, Port Richey
- Moving Companies, Port Richey
- Moving Supplies & Equipment Rental, Port Richey
- Moving Truck Rental , Port Richey
- Muffler Shop & Exhaust Systems, Port Richey
- Mulch, Peat & Moss Products, Port Richey
- Music, Port Richey
- Musical Instrument Manufacturers, Port Richey
- Musical Instrument Rental, Port Richey - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Port Richey
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