- Labor & Employment Consultants, New Hartford
- Labor Organizations, New Hartford
- Labor Relations Counselors, New Hartford
- Laboratories Allergy, New Hartford
- Laboratories Medical, New Hartford
- Ladies Ready To Wear, New Hartford
- Landscape Contractors & Designers, New Hartford
- Landscaping, New Hartford
- Landscaping Materials & Supplies, New Hartford
- Lawn & Garden Equipment & Supplies, New Hartford
- Lawn & Garden Services, New Hartford
- Lawn Maintenance Services, New Hartford
- Lawn Mowers & Power Equipment, New Hartford
- Lawyers & Attorneys, New Hartford
- Legal & Tax Services, New Hartford
- Legal Information & Referral Services, New Hartford
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- Legal Professionals, New Hartford
- Linens, New Hartford
- Lingerie & Underwear for Women, New Hartford - Bras, Panties, Bustiers, Corsets & More
- Liquor & Beer Manufacturers, New Hartford
- Liquor Stores, New Hartford
- Litigation / Trial Attorneys & Lawyers, New Hartford
- Livestock, New Hartford
- Livestock Auctions, New Hartford
- Livestock Auctions, New Hartford
- Loans Personal, New Hartford
- Lodging, New Hartford
- Lodging Services, New Hartford
- Long Haul Trucking Companies, New Hartford
- Lumber & Lumber Products, New Hartford
- Lumber & Lumber Products, New Hartford
- Lutheran Church, New Hartford
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