- Savings & Loan Associations, Onalaska
- Savings Banks, Onalaska
- Secondary Schools, Onalaska
- Security & Surveillance System & Equipment, Onalaska
- Security Services, Onalaska
- Senior Citizens Service & Health Organizations, Onalaska
- Septic Tanks & Systems, Onalaska - Wholesale, Dealers & Suppliers
- Septic Tanks & Systems Contractors & Designers, Onalaska
- Sharpening Service, Onalaska
- Shirts & T-Shirts, Onalaska
- Shopping & Shopping Services, Onalaska
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- Signs, Onalaska
- Social Services & Welfare, Onalaska
- Societies & Foundation Associations, Onalaska
- Special Interest Schools Or Instruction, Onalaska
- Specialty Animal Services, Onalaska
- Specialty Communication Companies & Services, Onalaska
- Specialty Stores, Onalaska
- Sporting Goods Stores, Onalaska
- Steel Erection Contractors, Onalaska - Steel Erectors
- Substance Abuse Clinics, Onalaska - Alcoholism, Addiction & Drug Abuse Treatment Centers
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