- Labor & Employment Consultants, Concord
- Laboratories Dental, Concord
- Laboratories Medical, Concord
- Lamp Shades, Concord
- Lamps & Lamp Shades Retail, Concord - Desk, Table & Floor Lamps
- Landscape Contractors & Designers, Concord
- Landscaping, Concord
- Laundry Self Service, Concord
- Lawyers & Attorneys, Concord
- Legal & Tax Services, Concord
- Legal Professionals, Concord
- Libraries, Concord
- Life Insurance, Concord
- Lighting Consultants, Concord
- Lighting Consultants & Designers, Concord
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- Lighting Contractors, Concord
- Lighting Fixtures & Equipment, Concord
- Lighting Fixtures Supplies & Parts Manufacturers, Concord
- Limousine Service, Concord
- Linens & Towels Manufacturers, Concord
- Liquor Stores, Concord
- Live Theaters, Concord
- Loans Personal, Concord
- Locks, Concord
- Locksmiths, Concord - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Concord
- Lodging, Concord
- Lumber & Lumber Products, Concord
- Lumber & Lumber Products, Concord
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