- Sandwich Shop Restaurants, Roundup
- Satellite & Cable TV Equipment & Systems, Roundup
- Satellite TV Service, Roundup
- Savings Banks, Roundup
- Sawmill & Planing Mills, Roundup
- Sawmill Supplies & Equipment Repair, Roundup
- Secondary Schools, Roundup
- Security Alarm Systems - Home & Business, Roundup
- Security Brokers & Dealers, Roundup
- Security Control Systems & Monitoring, Roundup - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Roundup
- Senior Citizens Service & Health Organizations, Roundup
- Septic Tank Installation & Repair, Roundup - Septic Systems
- Septic Tank Pumping & Cleaning, Roundup - Septic Systems
- Septic Tanks & Septic Systems Contractors, Roundup - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
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- Septic Tanks & Systems, Roundup
- Sheet Metal Contractors, Roundup - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Roundup
- Shoe Dyers, Roundup
- Shoe Repair Shops, Roundup
- Shoe Store - More, Roundup
- Shopping & Shopping Services, Roundup
- Social Service Organizations Volunteer Services, Roundup
- Social Services & Welfare, Roundup
- Special Education & Care, Roundup
- Specialty Stores, Roundup
- Sporting Goods Stores, Roundup
- State Government, Roundup
- Substance Abuse Clinics, Roundup - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Swimming Pools, Roundup
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