- Salvage Yards, Junk Yards & Wrecker Service, Altoona
- Sealcoating, Altoona - Asphalt Sealcoating & Paving
- Seals, Altoona - Hermetic, Hydraulic, Mechanical, Metal, Oil, Grease, etc
- Secondary Schools, Altoona
- Security Alarm Systems - Home & Business, Altoona
- Security Brokers & Dealers, Altoona
- Security Control Systems & Monitoring, Altoona - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Altoona
- Senior Citizens Service & Health Organizations, Altoona
- Septic Tank Installation & Repair, Altoona - Septic Systems
- Septic Tank Pumping & Cleaning, Altoona - Septic Systems
- Septic Tanks & Septic Systems Contractors, Altoona - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Altoona - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, Altoona
- Shopping & Shopping Services, Altoona
- Siding Contractors, Altoona - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Altoona
- Small Appliances, Altoona
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- Small Business & Office Equipment Repair Services, Altoona
- Snack Foods, Altoona
- Snow Removal Services, Altoona - Snow Plow Service
- Social Services & Welfare, Altoona
- Societies & Foundation Associations, Altoona
- Special Interest Schools Or Instruction, Altoona
- Speciality Food Stores, Altoona
- Specialty Animal Services, Altoona
- Specialty Stores, Altoona
- Sporting Goods Stores, Altoona
- Sports Medicine, Altoona - Doctors, Physicians & Surgeons
- Sprinkler System Contractors, Altoona - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Altoona
- Stationery & Office Supplies, Altoona
- Stationery Manufacturers, Altoona
- Stereo, Audio & Video Equipment Dealers & Stores, Altoona
- Stocks & Bond Brokers, Altoona
- Surveyor Services, Altoona - Surveying Service
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