- Sand Gravel & Aggregate, Dubois
- Satellite & Cable TV Equipment & Systems, Dubois
- Savings Banks, Dubois
- Secondary Schools, Dubois
- Secretarial & Court Reporting Services, Dubois
- Security Alarm Systems - Home & Business, Dubois
- Senior Citizens Information & Services, Dubois
- Senior Citizens Service & Health Organizations, Dubois
- Septic Systems Installation & Repair, Dubois
- Septic Tank Installation & Repair, Dubois - Septic Systems
- Septic Tank Pumping & Cleaning, Dubois - Septic Systems
- Septic Tanks & Septic Systems Contractors, Dubois - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Dubois
- Septic Tanks & Systems Inspection, Dubois
- Sewing & Yarn Stores & Supplies, Dubois
- Shopping & Shopping Services, Dubois
- Shopping Services, Dubois
- Skin Care & Cosmetology Salons, Dubois
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- Skin Care Products & Treatments, Dubois
- Snowmobile Dealers, Dubois - Parts, Gear, Clothing & Accessories
- Snowmobile Equipment & Supplies, Dubois
- Snowmobile Repair, Parts, Sales & Service, Dubois
- Social Services & Welfare, Dubois
- Societies & Foundation Associations, Dubois
- Soil Testing Labs, Dubois - Concrete Testing
- Special Education & Care, Dubois
- Special Interest Associations, Dubois
- Specialty Animal Services, Dubois
- Specialty Stores, Dubois
- Sporting & Recreational Camps, Dubois
- Sporting Goods Stores, Dubois
- State Government, Dubois
- Steak House Restaurants, Dubois
- Steel & Metal Goods, Dubois - Steel Distributors
- Stove, Oven, Range & Cooktop Parts & Supplies, Dubois
- Surveyor Services, Dubois - Surveying Service
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