- Sand Gravel & Aggregate, Plainfield
- Sandwich Shop Restaurants, Plainfield
- Scientific & Laboratory Equipment & Instruments, Plainfield
- Scrap & Waste Materials, Plainfield
- Secondary Schools, Plainfield
- Sheet Metal Contractors, Plainfield - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Plainfield
- Shopping & Shopping Services, Plainfield
- Siding Contractors, Plainfield - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Skating Rink & Hockey Operation Services, Plainfield
- Snow Removal Services, Plainfield - Snow Plow Service
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- Social & Human Services Autism Services, Plainfield
- Social Services & Welfare, Plainfield
- Societies & Foundation Associations, Plainfield
- Specialty Stores, Plainfield
- Sports Bars & Lounges, Plainfield
- Staffing & Support Services, Plainfield
- Steel & Metal Goods, Plainfield - Steel Distributors
- Storage Batteries Manufacturers, Plainfield
- Substance Abuse Clinics, Plainfield - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Plainfield - Surveying Service
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