- Machine Shop, Seneca
- Machine Shop & Tool Repair Service, Seneca
- Machinery Movers & Erectors, Seneca
- Machinery, Supplies & Equipment - Business Production Related, Seneca
- Machinery, Supplies & Equipment - Business Supplies Related, Seneca
- Machinery, Supplies & Equipment - Construction & Contractor Related, Seneca
- Mail Delivery Service, Seneca
- Mailbox Rental Services, Seneca
- Mailing, Delivery & Courier Service, Seneca
- Maintenance, Cleaning & Sanitation, Seneca
- Major Appliances, Seneca - Household & Kitchen
- Management Consultants & Services, Seneca
- Manicurists & Pedicurists, Seneca
- Manufacturing, Seneca
- Manufacturing & Industrial Consultants, Seneca
- Manufacturing Products, Seneca
- Marinas & Marina Services, Seneca
- Marine Supplies & Equipment, Seneca - Boat Supplies
- Marriage & Family Counselors, Seneca
- Martial Arts & Self Defense Schools, Seneca
- Masonry Contractors, Seneca - Stone Mason, Brick Mason - Install & Repair
- Massage Therapy, Seneca
- Material Handling Equipment, Seneca - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Seneca
- Medical & Dental Management, Seneca
- Medical & Health Service Organizations, Seneca
- Medical Management & Business Administration Service, Seneca
- Medical Research, Seneca
- Medical Research & Development, Seneca - Medical Information & Research
- Medical Supplies & Equipment, Seneca
- Membership Sports & Recreation Clubs, Seneca
- Men's Clothing Stores, Seneca - Clothes & Accessories
- Mental Health Clinics, Seneca - Treatment Centers
- Mental Health Specialists, Seneca - Psychologist, Psychiatrist, Psychotherapist, etc
- Merle Norman Cosmetics, Seneca
- Metal Buildings, Seneca - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Seneca
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- Metal Cutting Services, Seneca
- Metal Plating & Polishing, Seneca
- Methodist Church, Seneca
- Mexican Restaurants, Seneca
- Mildew Removal & Control, Seneca - Mold Removal
- Ministers, Seneca
- Ministries Church, Seneca
- Miscellaneous Household Item Repair, Seneca
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Seneca
- Miscellaneous Government, Seneca
- Miscellaneous Industry, Seneca
- Miscellaneous Photographers, Seneca
- Miscellaneous Professional, Seneca
- Mission Churches, Seneca
- Mobile Home Parks & Communities , Seneca
- Mobile Homes, Seneca
- Mobile Homes Manufactures, Seneca
- Moisture & Vapor Control, Seneca
- Monuments, Tombstones, Markers & Memorials, Seneca
- Mortgage Bankers & Correspondents, Seneca
- Mortgages & Loans, Seneca
- Motor Vehicle, Seneca
- Motor Vehicle Rental & Leasing, Seneca
- Motorcycle & Motor Scooters Dealers, Repair & Service, Seneca
- Motorcycle Parts, Accessories & Dealers, Seneca
- Motorcycle Repair & Service, Seneca
- Movie Theaters, Seneca
- Moving & Storage Supplies & Equipment, Seneca
- Moving Companies, Seneca
- Moving Truck Rental , Seneca
- Muffler Shop & Exhaust Systems, Seneca
- Mulch, Peat & Moss Products, Seneca
- Music, Seneca
- Musical Instruments & Equipment Stores, Seneca
- Musical Instruments Repair, Sales & Service, Seneca
- Musical Recording Services, Seneca
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