- Laboratories Dental, Castro Valley
- Laboratories Medical, Castro Valley
- Landscape Contractors & Designers, Castro Valley
- Landscape Garden Services, Castro Valley
- Landscaping, Castro Valley
- Late Night Restaurants, Castro Valley
- Laundromats & Dry-Cleaning, Coin-Operated, Castro Valley
- Lawn & Garden Equipment & Supplies, Castro Valley
- Lawn & Garden Services, Castro Valley
- Lawn Furnishings, Castro Valley
- Lawn Maintenance Services, Castro Valley
- Lawn Mowers & Power Equipment, Castro Valley
- Lawyers & Attorneys, Castro Valley
- Legal & Tax Services, Castro Valley
- Legal Professionals, Castro Valley
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- Libraries, Castro Valley
- Life Insurance, Castro Valley
- Lingerie & Underwear for Women, Castro Valley - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Castro Valley
- Livestock Trailers, Castro Valley
- Loans Personal, Castro Valley
- Locks, Castro Valley
- Locksmiths, Castro Valley - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Castro Valley
- Lodging, Castro Valley
- Lodging Services, Castro Valley
- Long Haul Trucking Companies, Castro Valley
- Lubricating Oils , Castro Valley - Motor Oil
- Lumber & Lumber Products, Castro Valley
- Lumber & Lumber Products, Castro Valley
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