- Machine Shop, Eureka
- Machine Shop & Tool Repair Service, Eureka
- Machinery Movers & Erectors, Eureka
- Machinery, Supplies & Equipment - Business Production Related, Eureka
- Machinery, Supplies & Equipment - Business Supplies Related, Eureka
- Machinery, Supplies & Equipment - Construction & Contractor Related, Eureka
- Magazine & Newspaper Stands, Eureka - Dealers & Distributors
- Mail Delivery Service, Eureka
- Mailbox Rental Services, Eureka
- Mailing, Delivery & Courier Service, Eureka
- Maintenance, Cleaning & Sanitation, Eureka
- Major Appliances, Eureka - Household & Kitchen
- Malls & Shopping Centers, Eureka
- Management Consultants & Services, Eureka
- Manicurists & Pedicurists, Eureka
- Manufacturing, Eureka
- Manufacturing Products, Eureka
- Maps & Globes, Eureka
- Marble, Eureka
- Marinas & Marina Services, Eureka
- Marine Pilot & Operator Service, Eureka
- Marine Products And Services, Eureka
- Marine Services, Eureka
- Marine Supplies & Equipment, Eureka - Boat Supplies
- Marriage & Family Counselors, Eureka
- Martial Arts & Self Defense Schools, Eureka
- Masonry Contractors, Eureka - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Eureka
- Massage Therapists & Professional, Eureka
- Massage Therapy, Eureka
- Material Handling Equipment, Eureka - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Eureka
- Medical & Dental Management, Eureka
- Medical & Health Service Organizations, Eureka
- Medical Alert Systems, Eureka - Medical Alarms - PERS
- Medical Billing Services, Eureka
- Medical Business Management Services, Eureka
- Medical Groups & Clinics, Eureka - Medical & Health Centers
- Medical Management & Business Administration Service, Eureka
- Medical Supplies & Equipment, Eureka
- Membership Sports & Recreation Clubs, Eureka
- Men's & Boys Clothing & Accessories Stores, Eureka
- Men's Clothing Stores, Eureka - Clothes & Accessories
- Mens & Boys Jeans & Western Wear Stores, Eureka
- Mental Health Clinics, Eureka - Treatment Centers
- Mental Health Specialists, Eureka - Psychologist, Psychiatrist, Psychotherapist, etc
- Messenger Service, Eureka - Message Receiving & Forwarding Service
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- Metal Repair Service & Blacksmith, Eureka - Iron Works
- Metal Roofs, Eureka
- Metal Tanks, Eureka
- Metaphysical Churches, Eureka
- Methodist Church, Eureka
- Mexican Food, Eureka
- Mexican Restaurants, Eureka
- Middle Eastern Restaurants, Eureka
- Mini & Self Storage, Eureka
- Ministries Church, Eureka
- Mirrors, Eureka - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Eureka
- Miscellaneous Agriculture, Eureka
- Miscellaneous Business Services, Eureka
- Miscellaneous Government, Eureka
- Miscellaneous Personal Services, Eureka
- Miscellaneous Photographers, Eureka
- Miscellaneous Professional, Eureka
- Mobile Home Contractors, Eureka
- Mobile Home Improvements & Repairs, Eureka
- Mobile Home Parks & Communities , Eureka
- Modular & Mobile Homes For Sale, Eureka - Manufactured Homes Sale & Service
- Moldings Materials, Eureka
- Monuments, Tombstones, Markers & Memorials, Eureka
- Mortgage Bankers & Correspondents, Eureka
- Mortgage Companies, Eureka
- Mortgages & Loans, Eureka
- Motion Picture Pre & Post Production Services, Eureka
- Motion Pictures Video Tape Duplication & Transfer Services, Eureka
- Motor Vehicle, Eureka
- Motor Vehicle Rental & Leasing, Eureka
- Motorcycle & Motor Scooters Dealers, Repair & Service, Eureka
- Motorcycle Parts, Accessories & Dealers, Eureka
- Motorcycle Repair & Service, Eureka
- Motorcycles Paint & Refinishing, Eureka
- Movie Theaters, Eureka
- Moving & Storage Supplies & Equipment, Eureka
- Moving Companies, Eureka
- Moving Supplies & Equipment Rental, Eureka
- Moving Truck Rental , Eureka
- Muffler Shop & Exhaust Systems, Eureka
- Museums, Eureka
- Music, Eureka
- Musical Instruments & Equipment Stores, Eureka
- Musical Instruments - Violins, Eureka
- Musical Instruments Repair, Sales & Service, Eureka
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