- Hair Care Professionals, Sylmar
- Hamburger Restaurants, Sylmar
- Handicapped Services, Sylmar
- Hang Gliders Renting, Sylmar
- Hang Gliding & Instruction, Sylmar
- Hardware Stores, Sylmar
- Harness, Saddles & Supplies, Sylmar
- Health & Diet Food Products - Wholesale & Retail, Sylmar
- Health & Medical, Sylmar
- Health And Medical Centers, Sylmar
- Health Care Information & Services, Sylmar
- Health Clubs & Gymnasiums, Sylmar
- Healthcare Providers, Practitioners & Professionals, Sylmar
- Heating & Air Conditioning Equipment, Parts & Supplies, Sylmar - HVAC Suppliers & Companies
- Heating & Air Conditioning Repair, Installation & Service Contractors, Sylmar - HVAC Contractors
- Heating & Air-Conditioning Contractors, Sylmar - HVAC Contractors - Installation, Repair, Replace Service, etc
- Heating & Plumbing Supplies Stores, Sylmar
- Heating Contractors, Sylmar - Heating Systems - Installation & Repair
- Heavy Equipment Hauling, Sylmar
- Herb & Spice Stores, Sylmar
- Highway Surfacing & Paving Contractors, Sylmar - Pavers - Paving Companies
- Holistic Health Practitioner, Sylmar - Holistic Medicine
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- Home Additions & Remodeling Contractors, Sylmar - Refinishing & Restoration
- Home Appliance Repair, Sales & Services, Sylmar
- Home Decor Stores, Sylmar - Home Decorations, Supplies & Accessories
- Home Health Care, Sylmar - Agencies & Services
- Home Security Companies & Services, Sylmar - Home Alarm Systems & Security Systems, Video Surveillance System, Etc
- Homeowners Insurance, Sylmar
- Homes Mentally Handicapped, Sylmar
- Horse Rental & Riding, Sylmar
- Horse Stables, Sylmar
- Horseback Riding Lessons & Instruction, Sylmar - Horse Riding School
- Hospices, Sylmar - Hospice Services
- Hospital, Dental & Medical Equipment & Supplies, Sylmar
- Hospitals, Sylmar
- Hot Dog Restaurants, Sylmar
- Hot Water Heater Installation & Repair, Sylmar - Gas & Electric Water Heater Services
- Hotels & Motels, Sylmar
- House & Apartment Cleaning, Sylmar
- Household & Commercial Appliances Stores, Sylmar
- Household Goods & Furniture Storage , Sylmar
- Housing Authority, Sylmar
- Hydromulching, Sylmar
- Hydroponics, Sylmar
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