- Machine Shop, Fairfield
- Machine Shop & Tool Repair Service, Fairfield
- Machinery And Equipment Manufacturers, Fairfield
- Machinery, Supplies & Equipment - Business Production Related, Fairfield
- Machinery, Supplies & Equipment - Business Supplies Related, Fairfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Fairfield
- Mailbox Rental Services, Fairfield
- Mailing, Delivery & Courier Service, Fairfield
- Maintenance, Cleaning & Sanitation, Fairfield
- Major Appliances, Fairfield - Household & Kitchen
- Management Consultants & Services, Fairfield
- Manicurists & Pedicurists, Fairfield
- Manufacturers Agents & Representatives, Fairfield
- Manufacturers Representative, Fairfield - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Fairfield
- Manufacturing Products, Fairfield
- Manufacturing Services, Fairfield
- Marine Supplies & Equipment, Fairfield - Boat Supplies
- Marriage & Family Counselors, Fairfield
- Martial Arts & Self Defense Schools, Fairfield
- Mary Kay Cosmetics, Fairfield
- Masonry Contractors, Fairfield - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Fairfield
- Massage Therapists & Professional, Fairfield
- Massage Therapy, Fairfield
- Material Handling Equipment, Fairfield - Conveyor Belt, Pallet Jack, Forklift, etc
- Mattress & Bedspring Manufacturers, Fairfield
- Meat Market, Wholesale & Products, Fairfield
- Mechanical Contractors, Fairfield - Install, Service & Repair
- Medical & Dental Management, Fairfield
- Medical Billing Services, Fairfield
- Medical Diagnostic Clinics, Fairfield - Clinical Labs & Centers
- Medical Management & Business Administration Service, Fairfield
- Medical Supplies & Equipment, Fairfield
- Men's Clothing Stores, Fairfield - Clothes & Accessories
- Mental Health Specialists, Fairfield - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Fairfield
- Merle Norman Cosmetics, Fairfield
- Metal Buildings, Fairfield - Kits, Homes, Steel Buildings, etc
- Metal Finishers, Fairfield
- Metal Heat Treating, Fairfield
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- Metal Plating & Polishing, Fairfield
- Metal Products, Fairfield
- Metal Repair Service & Blacksmith, Fairfield - Iron Works
- Metal Stampings Manufacturers, Fairfield
- Methodist Church, Fairfield
- Mexican Restaurants, Fairfield
- Mildew Removal & Control, Fairfield - Mold Removal
- Mini & Self Storage, Fairfield
- Ministries Church, Fairfield
- Mirrors, Fairfield - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Manufacturing, Fairfield
- Miscellaneous Business Product Repair, Fairfield
- Miscellaneous Household Item Repair, Fairfield
- Miscellaneous Agriculture, Fairfield
- Miscellaneous Business Services, Fairfield
- Miscellaneous Government, Fairfield
- Miscellaneous Manufacturing, Fairfield
- Miscellaneous Metal Work Manufacturers, Fairfield
- Miscellaneous Personal Services, Fairfield
- Miscellaneous Professional, Fairfield
- Mission Churches, Fairfield
- Mobile Home Parks & Communities , Fairfield
- Monuments, Tombstones, Markers & Memorials, Fairfield
- Mortgage Bankers & Correspondents, Fairfield
- Mortgage Companies, Fairfield
- Mortgage Loan Processors, Fairfield
- Mortgages & Loans, Fairfield
- Motion Picture Pre & Post Production Services, Fairfield
- Motor Sports, Fairfield
- Motor Vehicle, Fairfield
- Motor Vehicle Rental & Leasing, Fairfield
- Motorcycle & Motor Scooters Dealers, Repair & Service, Fairfield
- Motorcycle Parts, Accessories & Dealers, Fairfield
- Motorcycle Repair & Service, Fairfield
- Moving & Storage Supplies & Equipment, Fairfield
- Moving Companies, Fairfield
- Moving Supplies & Equipment Rental, Fairfield
- Moving Truck Rental , Fairfield
- Muffler Shop & Exhaust Systems, Fairfield
- Mulch, Peat & Moss Products, Fairfield
- Music, Fairfield
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