- Laboratories Medical, Seal Beach
- Laboratories Pathological, Seal Beach
- Landscape Contractors & Designers, Seal Beach
- Landscaping, Seal Beach
- Laser Hair Removal, Seal Beach
- Late Night Restaurants, Seal Beach
- Laundromats & Dry-Cleaning, Coin-Operated, Seal Beach
- Laundry Self Service, Seal Beach
- Lawn & Garden Equipment & Supplies, Seal Beach
- Lawyers & Attorneys, Seal Beach
- Legal & Tax Services, Seal Beach
- Legal Information & Referral Services, Seal Beach
- Legal Professionals, Seal Beach
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- Libraries, Seal Beach
- Limousine Service, Seal Beach
- Linens, Seal Beach
- Liquor Stores, Seal Beach
- Loans Personal, Seal Beach
- Locks, Seal Beach
- Locksmiths, Seal Beach - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Seal Beach
- Lodging, Seal Beach
- Long Haul Trucking Companies, Seal Beach
- Luggage & Accessories , Seal Beach
- Lutheran Church, Seal Beach
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