- Machine Shop, Signal Hill
- Machine Shop & Tool Repair Service, Signal Hill
- Machine Shop Rotary Surface Grinding, Signal Hill - Tool Grinding & Sharpening
- Machine Tools , Signal Hill
- Machinery And Equipment Manufacturers, Signal Hill
- Machinery Custom Design Manufacturers, Signal Hill
- Machinery, Supplies & Equipment - Business Production Related, Signal Hill
- Machinery, Supplies & Equipment - Business Supplies Related, Signal Hill
- Machinery, Supplies & Equipment - Construction & Contractor Related, Signal Hill
- Mailbox Rental Services, Signal Hill
- Mailing, Delivery & Courier Service, Signal Hill
- Major Appliances, Signal Hill - Household & Kitchen
- Management Consultants & Services, Signal Hill
- Manicurists & Pedicurists, Signal Hill
- Manufacturers Agents & Representatives, Signal Hill
- Manufacturers Representative, Signal Hill - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Signal Hill
- Manufacturing Products, Signal Hill
- Marinas & Aquariums, Signal Hill
- Marine Products And Services, Signal Hill
- Marine Repair & Service Stations, Signal Hill
- Marine Supplies & Equipment, Signal Hill - Boat Supplies
- Marine Supplies & Equipment Repair, Signal Hill - Boat Supplies & Equipment
- Marking, Stamping & Engraving Equipment, Signal Hill
- Marriage & Family Counselors, Signal Hill
- Martial Arts & Self Defense Schools, Signal Hill
- Masonry Contractors, Signal Hill - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Signal Hill
- Measuring Equipment, Signal Hill
- Mechanical Contractors, Signal Hill - Install, Service & Repair
- Media Research, Signal Hill
- Medical & Dental Management, Signal Hill
- Medical Billing Software, Signal Hill
- Medical Business Management Services, Signal Hill
- Medical Management & Business Administration Service, Signal Hill
- Medical Research, Signal Hill
- Medical Research & Development, Signal Hill - Medical Information & Research
- Medical Supplies & Equipment, Signal Hill
- Membership Sports & Recreation Clubs, Signal Hill
- Men's & Boys Clothing & Accessories Stores, Signal Hill
- Men's Clothing Stores, Signal Hill - Clothes & Accessories
- Mens & Boys T-Shirts & Undergarments, Signal Hill
- Mental Health Specialists, Signal Hill - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Signal Hill
- Merchandising & Marketing Consultants, Signal Hill
- Messenger Service, Signal Hill - Message Receiving & Forwarding Service
- Metal Coating & Allied Services, Signal Hill
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- Metal Cutting Services, Signal Hill
- Metal Perforating & Punching, Signal Hill
- Metal Plating & Polishing, Signal Hill
- Metal Repair Service & Blacksmith, Signal Hill - Iron Works
- Mexican Restaurants, Signal Hill
- Mini & Self Storage, Signal Hill
- Mining, Signal Hill
- Miscellaneous Household Item Repair, Signal Hill
- Miscellaneous Business Services, Signal Hill
- Miscellaneous Government, Signal Hill
- Miscellaneous Industry, Signal Hill
- Miscellaneous Manufacturing, Signal Hill
- Miscellaneous Personal Services, Signal Hill
- Miscellaneous Photographers, Signal Hill
- Miscellaneous Professional, Signal Hill
- Mission Churches, Signal Hill
- Money Change Machines, Signal Hill
- Money Counting & Wrapping, Signal Hill
- Mortgage Bankers & Correspondents, Signal Hill
- Mortgage Companies, Signal Hill
- Mortgages & Loans, Signal Hill
- Motion Picture & Television Production Services, Signal Hill
- Motion Picture Equipment & Supplies, Signal Hill
- Motor Vehicle, Signal Hill
- Motor Vehicle Rental & Leasing, Signal Hill
- Motorcycle & ATV Repair & Service, Signal Hill
- Motorcycle & Motor Scooters Dealers, Repair & Service, Signal Hill
- Motorcycle Parts, Accessories & Dealers, Signal Hill
- Motorcycle Repair & Service, Signal Hill
- Motorcycles Paint & Refinishing, Signal Hill
- Mountain & Rock Climbing Instruction, Signal Hill
- Moving & Storage Supplies & Equipment, Signal Hill
- Moving Companies, Signal Hill
- Moving Services - Labor & Material, Signal Hill
- Moving Supplies & Equipment Rental, Signal Hill
- Moving Truck Rental , Signal Hill
- Multimedia Publishers, Signal Hill - Multimedia Services & Systems
- Music, Signal Hill
- Music Entertainment, Signal Hill
- Music Production Services, Signal Hill
- Musical Instrument Manufacturers, Signal Hill
- Musical Instrument Rental, Signal Hill - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Signal Hill
- Musical Instruments - Guitars, Signal Hill
- Musical Instruments Repair, Sales & Service, Signal Hill
- Musical Recording Services, Signal Hill
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