- Laboratories Dental, Penn Valley
- Laboratories Medical, Penn Valley
- Landscape Contractors & Designers, Penn Valley
- Landscape Garden Services, Penn Valley
- Landscaping, Penn Valley
- Landscaping Materials & Supplies, Penn Valley
- Laundromats & Dry-Cleaning, Coin-Operated, Penn Valley
- Laundry & Dry Cleaning Equipment & Supplies, Penn Valley - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Self Service, Penn Valley
- Lawn & Garden Equipment & Supplies, Penn Valley
- Lawn & Garden Services, Penn Valley
- Lawn Furnishings, Penn Valley
- Lawn Maintenance Services, Penn Valley
- Lawn Mower Repair & Blade Sharpening Service, Penn Valley
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- Lawyers & Attorneys, Penn Valley
- Legal Professionals, Penn Valley
- Libraries, Penn Valley
- Life Insurance, Penn Valley
- Liquid Transportation - Non Hazardous, Penn Valley
- Livestock, Penn Valley
- Locks, Penn Valley
- Locks Commercial & Industrial, Penn Valley
- Locksmiths, Penn Valley - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Commercial & Industrial, Penn Valley
- Locksmiths Equipment & Supplies, Penn Valley
- Log Homes - Log Cabins Builders, Penn Valley - Building Contractors
- Long Haul Trucking Companies, Penn Valley
- Lottery Game Retailers, Penn Valley
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