- Machine Shop & Tool Repair Service, Eureka
- Machinery, Supplies & Equipment - Business Supplies Related, Eureka
- Machinery, Supplies & Equipment - Construction & Contractor Related, Eureka
- Mailbox Rental Services, Eureka
- Mailing, Delivery & Courier Service, Eureka
- Major Appliances, Eureka - Household & Kitchen
- Management Consultants & Services, Eureka
- Manicurists & Pedicurists, Eureka
- Manufacturing, Eureka
- Manufacturing Products, Eureka
- Marine Products And Services, Eureka
- Marine Services, Eureka
- Marine Supplies & Equipment, Eureka - Boat Supplies
- Marriage & Family Counselors, Eureka
- Masonry Contractors, Eureka - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Eureka
- Massage Therapy, Eureka
- Meat Market, Wholesale & Products, Eureka
- Membership Sports & Recreation Clubs, Eureka
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- Mental Health Specialists, Eureka - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Powder Parts Fabricators, Eureka
- Mexican Restaurants, Eureka
- Mini & Self Storage, Eureka
- Miscellaneous Government, Eureka
- Miscellaneous Personal Services, Eureka
- Miscellaneous Professional, Eureka
- Mortgage Bankers & Correspondents, Eureka
- Mortgage Companies, Eureka
- Mortgages & Loans, Eureka
- Motion Picture Pre & Post Production Services, Eureka
- Motor Vehicle, Eureka
- Motor Vehicle Rental & Leasing, Eureka
- Movie Theaters, Eureka
- Moving & Storage Supplies & Equipment, Eureka
- Moving Truck Rental , Eureka
- Muffler Shop & Exhaust Systems, Eureka
- Museums, Eureka
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