- Machine Shop, Placentia
- Machine Shop & Tool Repair Service, Placentia
- Machine Tools , Placentia
- Machinery And Equipment Manufacturers, Placentia
- Machinery Custom Design Manufacturers, Placentia
- Machinery Movers & Erectors, Placentia
- Machinery, Supplies & Equipment - Business Production Related, Placentia
- Machinery, Supplies & Equipment - Business Supplies Related, Placentia
- Machinery, Supplies & Equipment - Construction & Contractor Related, Placentia
- Mailbox Rental Services, Placentia
- Mailing, Delivery & Courier Service, Placentia
- Maintenance, Cleaning & Sanitation, Placentia
- Major Appliances, Placentia - Household & Kitchen
- Management Consultants & Services, Placentia
- Manicurists & Pedicurists, Placentia
- Manifold Business Forms Manufacturers, Placentia
- Manufacturers Agents & Representatives, Placentia
- Manufacturers Representative, Placentia - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Placentia
- Manufacturing Products, Placentia
- Marketing Schools, Placentia
- Marriage & Family Counselors, Placentia
- Martial Arts & Self Defense Schools, Placentia
- Massage Therapists & Professional, Placentia
- Massage Therapy, Placentia
- Material Handling & Heavy Machinery & Equipment, Placentia
- Material Handling Equipment, Placentia - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Placentia
- Medical & Dental Management, Placentia
- Medical Business Management Services, Placentia
- Medical Diagnostic Imaging, Placentia
- Medical Equipment Manufacturers, Placentia
- Medical Management & Business Administration Service, Placentia
- Medical Supplies & Equipment, Placentia
- Meeting & Event Planning Services, Placentia - Conference Consultants
- Membership Sports & Recreation Clubs, Placentia
- Men's Clothing Stores, Placentia - Clothes & Accessories
- Mental Health Specialists, Placentia - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Placentia
- Metal Coating & Allied Services, Placentia
- Metal Deburring, Placentia
- Metal Services, Placentia
- Metal Stampings Manufacturers, Placentia
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- Metals Base, Placentia
- Mexican Restaurants, Placentia
- Michelin Tires, Placentia - Dealers
- Mildew Removal & Control, Placentia - Mold Removal
- Millwork Manufacturers, Placentia
- Mini & Self Storage, Placentia
- Mining, Placentia
- Miscellaneous Business Product Repair, Placentia
- Miscellaneous Household Item Repair, Placentia
- Miscellaneous Business Services, Placentia
- Miscellaneous Government, Placentia
- Miscellaneous Industry, Placentia
- Miscellaneous Manufacturing, Placentia
- Miscellaneous Metal Work Manufacturers, Placentia
- Miscellaneous Personal Services, Placentia
- Miscellaneous Photographers, Placentia
- Miscellaneous Professional, Placentia
- Mobile Home Contractors, Placentia
- Mobile Home Improvements & Repairs, Placentia
- Mobile Home Parks & Communities , Placentia
- Modular & Mobile Homes For Sale, Placentia - Manufactured Homes Sale & Service
- Moldings Materials, Placentia
- Molds, Placentia
- Mortgage Bankers & Correspondents, Placentia
- Mortgage Brokers, Placentia
- Mortgage Companies, Placentia
- Mortgage Feasibility Consultants, Placentia
- Mortgages & Loans, Placentia
- Motivational Speakers & Consultants, Placentia - Speakers, Lectures & Seminars
- Motor Vehicle, Placentia
- Motor Vehicle Rental & Leasing, Placentia
- Motorcycle & Motor Scooters Dealers, Repair & Service, Placentia
- Motorcycle Parts, Accessories & Dealers, Placentia
- Motorcycle Repair & Service, Placentia
- Moving & Storage Supplies & Equipment, Placentia
- Moving Companies, Placentia
- Moving Supplies & Equipment Rental, Placentia
- Moving Truck Rental , Placentia
- Muffler Shop & Exhaust Systems, Placentia
- Museums, Placentia
- Music, Placentia
- Music Production Services, Placentia
- Musical Recording Services, Placentia
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