- Salvage Yards, Junk Yards & Wrecker Service, Alva
- Sand Gravel & Aggregate, Alva
- Sandwich Shop Restaurants, Alva
- Savings & Loan Associations, Alva
- Savings Banks, Alva
- Secondary Schools, Alva
- Security & Commodity Brokers, Alva
- Security Brokers & Dealers, Alva
- Senior Citizens Service & Health Organizations, Alva
- Septic Tank Installation & Repair, Alva - Septic Systems
- Septic Tank Pumping & Cleaning, Alva - Septic Systems
- Septic Tanks & Septic Systems Contractors, Alva - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewing & Yarn Stores & Supplies, Alva
- Sewing Machines, Equipment & Supplies, Alva
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- Shirts & T-Shirts, Alva
- Shoe Stores, Alva - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Alva
- Ski Centers, Alva
- Ski Resorts, Alva
- Small Appliances, Alva
- Social Services & Welfare, Alva
- Specialty Animal Services, Alva
- Specialty Stores, Alva
- State Government, Alva
- Stereo, Audio & Video Equipment Dealers & Stores, Alva
- Stocks & Bond Brokers, Alva
- Substance Abuse Clinics, Alva - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Alva - Surveying Service
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