- Labeling Equipment & Supplies, Rockville
- Labels & Tags, Rockville
- Labor & Employment Consultants, Rockville
- Labor And Employment Relations Attorneys & Lawyers, Rockville
- Labor And Employment Relations Lawyers & Attorneys, Rockville
- Labor Organizations, Rockville
- Laboratories Allergy, Rockville
- Laboratories Dental, Rockville
- Laboratories Medical, Rockville
- Ladies Ready To Wear, Rockville
- Lamp Repair, Rockville
- Land Companies, Rockville
- Land Surveyor, Rockville - Land Surveying Services
- Landlord - Tenant Attorneys & Lawyers, Rockville
- Landlord - Tenant Lawyers & Attorneys, Rockville
- Landlord And Tenant Attorneys & Lawyers, Rockville
- Landscape Contractors & Designers, Rockville
- Landscape Design & Installation, Rockville
- Landscape Garden Services, Rockville
- Landscaping, Rockville
- Landscaping Materials & Supplies, Rockville
- Language Schools, Rockville
- Language Training Aids, Rockville
- Late Night Restaurants, Rockville
- Latin American Restaurants, Rockville
- Laundry Self Service, Rockville
- Lawn & Garden Equipment & Supplies, Rockville
- Lawn & Garden Services, Rockville
- Lawn & Garden Sprinkler Systems, Rockville
- Lawn Furnishings, Rockville
- Lawn Hydroseeding, Rockville
- Lawn Maintenance Services, Rockville
- Lawn Mower Repair & Blade Sharpening Service, Rockville
- Lawn Mowers & Power Equipment, Rockville
- Lawyers & Attorneys, Rockville
- Lead Inspection, Testing & Consulting, Rockville - Lead Paint
- Leather Apparel Goods Manufacturers, Rockville
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- Leather Goods, Rockville
- Leather Goods & Luggage Repair, Rockville
- Leather Goods Stores & Dealers, Rockville
- Lebanese Restaurants, Rockville
- Legal & Tax Services, Rockville
- Legal Clinics, Rockville
- Legal Information & Referral Services, Rockville
- Legal Professionals, Rockville
- Letter Shop & Addressing Services, Rockville
- Libraries, Rockville
- Library Furniture, Rockville
- Licensed Counselors, Rockville
- Life Insurance, Rockville
- Lighting Consultants & Designers, Rockville
- Lighting Fixtures & Equipment, Rockville
- Lighting Fixtures Repair, Maintenance & Installation, Rockville
- Limousine Service, Rockville
- Linens, Rockville
- Lingerie & Underwear for Women, Rockville - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Rockville
- Lithographic Printing, Rockville
- Litigation / Trial Attorneys & Lawyers, Rockville
- Live Theaters, Rockville
- Living Room Furniture, Rockville
- Loans Personal, Rockville
- Local & Short Haul Trucking Companies, Rockville
- Locks, Rockville
- Locksmiths, Rockville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Rockville
- Lodging, Rockville
- Lodging Hostels, Rockville
- Lodging Services, Rockville
- Long Haul Trucking Companies, Rockville
- Luggage & Accessories , Rockville
- Lumber & Lumber Products, Rockville
- Lumber & Lumber Products, Rockville
- Lutheran Church, Rockville
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