- Labor Organizations, Rockville Centre
- Laboratories Medical, Rockville Centre
- Laboratory Equipment Repair & Service, Rockville Centre
- Land Surveyor, Rockville Centre - Land Surveying Services
- Landscape Contractors & Designers, Rockville Centre
- Landscaping, Rockville Centre
- Laser Equipment Repair & Service, Rockville Centre
- Laundry Self Service, Rockville Centre
- Lawn & Garden Equipment & Supplies, Rockville Centre
- Lawn & Garden Services, Rockville Centre
- Lawn & Garden Sprinkler Systems, Rockville Centre
- Lawn & Garden Supplies & Equipment, Rockville Centre
- Lawn Maintenance Services, Rockville Centre
- Lawyers & Attorneys, Rockville Centre
- Legal & Tax Services, Rockville Centre
- Legal Documents Preparation Services, Rockville Centre - Legal Forms
- Legal Professionals, Rockville Centre
- Libraries, Rockville Centre
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- Licensed Counselors, Rockville Centre
- Life Insurance, Rockville Centre
- Lighting Fixtures & Equipment, Rockville Centre
- Limousine Service, Rockville Centre
- Lingerie & Underwear for Women, Rockville Centre - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Rockville Centre
- Loans Personal, Rockville Centre
- Locks, Rockville Centre
- Locksmiths, Rockville Centre - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Rockville Centre
- Lodging, Rockville Centre
- Lodging Services, Rockville Centre
- Long Haul Trucking Companies, Rockville Centre
- Lumber & Lumber Products, Rockville Centre
- Lumber & Lumber Products, Rockville Centre
- Lumber Companies, Rockville Centre - Wholesale, Manufacturers & Suppliers
- Luncheonette Restaurants, Rockville Centre
- Lutheran Church, Rockville Centre
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