- Machine Shop, Placerville
- Machine Shop & Tool Repair Service, Placerville
- Machinery, Supplies & Equipment - Business Production Related, Placerville
- Machinery, Supplies & Equipment - Business Supplies Related, Placerville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Placerville
- Mailbox Rental Services, Placerville
- Mailing, Delivery & Courier Service, Placerville
- Major Appliance Repair & Service, Placerville
- Major Appliances, Placerville - Household & Kitchen
- Make Up & Cosmetics Application, Placerville
- Malls & Shopping Centers, Placerville
- Management Consultants & Services, Placerville
- Manicurists & Pedicurists, Placerville
- Manufactured & Mobile Home Movers & Transporting, Placerville
- Manufacturers Agents & Representatives, Placerville
- Manufacturers Representative, Placerville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Placerville
- Manufacturing Products, Placerville
- Marketing Schools, Placerville
- Marriage & Family Counselors, Placerville
- Martial Arts & Self Defense Schools, Placerville
- Masonry Contractors, Placerville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Placerville
- Massage Parlor & Steam Bath Services, Placerville
- Massage Therapists & Professional, Placerville
- Massage Therapy, Placerville
- Mausoleums Developers, Placerville
- Maytag Appliances, Placerville
- Meat Cutting Services, Placerville
- Meat Market, Wholesale & Products, Placerville
- Meat Packers, Placerville
- Mechanical Engineer, Placerville - Mechanical Engineering Service
- Mechanical Seals, Placerville
- Medical & Dental Management, Placerville
- Medical & Health Service Organizations, Placerville
- Medical Billing Services, Placerville
- Medical Business Management Services, Placerville
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Placerville
- Medical Groups & Clinics, Placerville - Medical & Health Centers
- Medical Management & Business Administration Service, Placerville
- Medical Supplies & Equipment, Placerville
- Meeting & Event Planning Services, Placerville - Conference Consultants
- Men's & Boys Clothing & Accessories Stores, Placerville
- Men's Clothing Stores, Placerville - Clothes & Accessories
- Mens & Boys Jeans & Western Wear Stores, Placerville
- Mental Health Specialists, Placerville - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Coating & Allied Services, Placerville
- Metal Cutting Services, Placerville
- Metal Repair Service & Blacksmith, Placerville - Iron Works
- Metal Windows, Placerville
- Metals Base, Placerville
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- Metaphysical Churches, Placerville
- Mexican Restaurants, Placerville
- Military Supplies, Placerville
- Millwork Contractors, Placerville
- Mini & Self Storage, Placerville
- Mining, Placerville
- Mining Consultants, Placerville
- Mining Contractors, Placerville - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Placerville - Mining Companies
- Mirrors, Placerville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Placerville
- Miscellaneous Household Item Repair, Placerville
- Miscellaneous Agriculture, Placerville
- Miscellaneous Business Services, Placerville
- Miscellaneous Government, Placerville
- Miscellaneous Industry, Placerville
- Miscellaneous Manufacturing, Placerville
- Miscellaneous Personal Services, Placerville
- Miscellaneous Photographers, Placerville
- Miscellaneous Professional, Placerville
- Mission Churches, Placerville
- Mobile Automobile Services, Placerville
- Mobile Home Parks & Communities , Placerville
- Modular & Mobile Homes For Sale, Placerville - Manufactured Homes Sale & Service
- Moldings Materials, Placerville
- Monuments, Tombstones, Markers & Memorials, Placerville
- Mortgage Bankers & Correspondents, Placerville
- Mortgage Companies, Placerville
- Mortgages & Loans, Placerville
- Motion Picture Pre & Post Production Services, Placerville
- Motor Vehicle, Placerville
- Motor Vehicle Rental & Leasing, Placerville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Placerville
- Motorcycle Parts, Accessories & Dealers, Placerville
- Motorcycle Repair & Service, Placerville
- Movie Theaters, Placerville
- Moving & Storage Supplies & Equipment, Placerville
- Moving Companies, Placerville
- Moving Truck Rental , Placerville
- Muffler Shop & Exhaust Systems, Placerville
- Murals & Faux Finish Walls, Placerville
- Museums, Placerville
- Music, Placerville
- Music Entertainment, Placerville
- Music Lessons, Placerville
- Music Lessons - Instrumental, Placerville
- Musical Instrument Rental, Placerville - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Placerville
- Musical Instruments Repair, Sales & Service, Placerville
- Musical Recording Services, Placerville
- Musicians, Bands & Disc Jockeys, Placerville
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