- Laboratories Medical, Norwich
- Landscape Contractors & Designers, Norwich
- Landscaping, Norwich
- Laundromats & Dry-Cleaning, Coin-Operated, Norwich
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Norwich
- Lawyers & Attorneys, Norwich
- Leather Goods, Norwich
- Leather Tanning & Finishing Manufacturers, Norwich
- Legal Professionals, Norwich
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