- Sand Gravel & Aggregate, Neillsville
- Sandwich Shop Restaurants, Neillsville
- Sawmill & Planing Mills, Neillsville
- Sawmill Supplies & Equipment Repair, Neillsville
- Screen Printing, Neillsville
- Secondary Schools, Neillsville
- Security Brokers & Dealers, Neillsville
- Security Services, Neillsville
- Senior Citizens Service & Health Organizations, Neillsville
- Septic Tank Installation & Repair, Neillsville - Septic Systems
- Septic Tank Pumping & Cleaning, Neillsville - Septic Systems
- Septic Tanks & Septic Systems Contractors, Neillsville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Neillsville - Wholesale, Dealers & Suppliers
- Sewer & Drain Cleaning & Repair, Neillsville - Drain Cleaner & Installation Services
- Sheriff's Department, Neillsville
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- Shopping & Shopping Services, Neillsville
- Small Appliances, Neillsville
- Social Services & Welfare, Neillsville
- Societies & Foundation Associations, Neillsville
- Soil Testing Labs, Neillsville - Concrete Testing
- Special Interest Schools Or Instruction, Neillsville
- Specialty Animal Services, Neillsville
- Specialty Stores, Neillsville
- Sport & Entertainment Associations, Neillsville
- Sporting Goods Stores, Neillsville
- Sports Bars & Lounges, Neillsville
- Staffing & Support Services, Neillsville
- State Government, Neillsville
- Support Services, Neillsville
- Surveyor Services, Neillsville - Surveying Service
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