- Laboratories Medical, Plainfield
- Land Surveyor, Plainfield - Land Surveying Services
- Late Night Restaurants, Plainfield
- Laundromats & Dry-Cleaning, Coin-Operated, Plainfield
- Laundry Self Service, Plainfield
- Lawyers & Attorneys, Plainfield
- Legal & Tax Services, Plainfield
- Legal Information & Referral Services, Plainfield
- Legal Professionals, Plainfield
- Libraries, Plainfield
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- Life Insurance, Plainfield
- Liquor Stores, Plainfield
- Loans Personal, Plainfield
- Locksmiths, Plainfield - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Plainfield
- Lodging Services, Plainfield
- Long Haul Trucking Companies, Plainfield
- Lumber & Lumber Products, Plainfield
- Lumber & Lumber Products, Plainfield
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