- Laboratories Medical, Rockville
- Laundromats & Dry-Cleaning, Coin-Operated, Rockville
- Laundry Self Service, Rockville
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Rockville
- Lawn & Garden Equipment & Supplies, Rockville
- Lawn Mowers & Power Equipment, Rockville
- Lawyers & Attorneys, Rockville
- Legal Professionals, Rockville
- Libraries, Rockville
- License Services, Rockville
- Life Insurance, Rockville
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- Liquor Stores, Rockville
- Live Theaters, Rockville
- Livestock, Rockville
- Livestock Auctions, Rockville
- Livestock Auctions, Rockville
- Lodging, Rockville
- Lodging Services, Rockville
- Long Haul Trucking Companies, Rockville
- Lumber & Wood Products Manufacturers, Rockville
- Lumber Brokers, Rockville
- Lumber Companies, Rockville - Wholesale, Manufacturers & Suppliers
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