- Sandwich Shop Restaurants, Poplarville
- Satellite TV Service, Poplarville
- Seafood Restaurants, Poplarville
- Secondary Schools, Poplarville
- Security Brokers & Dealers, Poplarville
- Septic Tank Pumping & Cleaning, Poplarville - Septic Systems
- Sheet Metal Contractors, Poplarville - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Poplarville
- Sheriff's Department, Poplarville
- Shirts & T-Shirts, Poplarville
- Shopping & Shopping Services, Poplarville
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- Signs, Poplarville
- Small Appliances, Poplarville
- Social Services & Welfare, Poplarville
- Sod & Sodding Service, Poplarville
- Special Education & Care, Poplarville
- Specialty Animal Services, Poplarville
- Specialty Stores, Poplarville
- Sports Medicine, Poplarville - Doctors, Physicians & Surgeons
- State Government, Poplarville
- Steel Manufacturers, Poplarville
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Poplarville
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