- Safety Equipment & Supplies, Altoona
- Sales & Marketing Consultant, Altoona
- Sand Gravel & Aggregate, Altoona
- Sandwich Shop Restaurants, Altoona
- Satellite & Cable TV Equipment & Systems, Altoona
- Satellite & Cable TV Equipment & Systems Repair & Service, Altoona
- Satellite Dish Antennas & Equipment Dealers, Altoona
- Satellite TV Service, Altoona
- Savings & Loan Associations, Altoona
- Savings Banks, Altoona
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Altoona
- Scales Retail, Altoona
- School - Catholic, Altoona
- School - Christian, Altoona
- School Bus Transportation Service, Altoona
- Scientific & Laboratory Equipment & Instruments, Altoona
- Scrap & Waste Machinery, Altoona
- Scrap & Waste Materials, Altoona
- Screen Printing, Altoona
- Seafood Restaurants, Altoona
- Secondary Schools, Altoona
- Secretarial & Court Reporting Services, Altoona
- Security & Surveillance System & Equipment, 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 Guard & Patrol Service, Altoona - Bodyguard, Guard Dogs, Etc
- Security Investigative Services, Altoona
- Security Services, Altoona
- Self Defense Programs, Altoona
- Senior Citizens Information & Services, Altoona
- Senior Citizens Service & Health Organizations, Altoona
- Septic & Cesspool Equipment & Supplies, 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
- Septic Tanks & Systems, Altoona - Wholesale, Dealers & Suppliers
- Service & Gas Station Equipment & Services, Altoona
- Sewer & Drain Cleaning & Repair, Altoona - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Altoona - Sewer Line, Pipe Installation & Repair Services
- Sewing & Yarn Stores & Supplies, Altoona
- Sewing Machines, Equipment & Supplies, Altoona
- Sharpening Service, Altoona
- Sheet Metal Contractors, Altoona - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Altoona
- Shirts & T-Shirts, Altoona
- Shoe Repair Shops, Altoona
- Shoe Store - More, Altoona
- Shoe Stores, Altoona - Mens, Womens & Kids Shoes
- Shooting & Target Ranges, Altoona
- Shopping & Shopping Services, Altoona
- Siding Contractors, Altoona - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Altoona
- Skin Care & Cosmetology Salons, Altoona
- Skin Care Products & Treatments, Altoona
- Sleep Disorders Treatment & Information Centers, Altoona
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- Small Appliances, Altoona
- Smoke Odor Counteracting Services, Altoona
- Snack Foods, Altoona
- Snacks & Desserts, Altoona
- Snow Removal Services, Altoona - Snow Plow Service
- Snowmobile Dealers, Altoona - Parts, Gear, Clothing & Accessories
- Social Security And Disability Attorneys & Lawyers, Altoona
- Social Security And Disability Lawyers & Attorneys, Altoona
- Social Services & Welfare, Altoona
- Social Workers & Services, Altoona
- Societies & Foundation Associations, Altoona
- Sororities, Altoona
- Sound Systems & Recording Equipment, Altoona
- Sound Systems, Microphones & Equipment, Altoona
- Southern Style Restaurants, Altoona
- Special Dies Tools Jigs & Fixtures Manufacturers, Altoona
- Special Education & Care, Altoona
- Special Interest Schools Or Instruction, Altoona
- Speciality Food Stores, Altoona
- Specialty Animal Services, Altoona
- Specialty Stores, Altoona
- Speech & Hearing Specialists, Altoona
- Speech & Language Therapy, Altoona
- Sporting Goods Stores, Altoona
- Sports & Recreational Services, Altoona
- Sports Bars & Lounges, Altoona
- Sports Clubs, Altoona
- Sportswear Clothing Stores, Altoona - Sports Clothes
- Springs Automotive, Altoona
- Staffing & Support Services, Altoona
- Stamp Collecting & Coin Dealers , Altoona
- State Government, Altoona
- Stationery & Office Supplies, Altoona
- Steak House Restaurants, Altoona
- Steel & Metal Goods, Altoona - Steel Distributors
- Steel Erection Contractors, Altoona - Steel Erectors
- Steel Manufacturers, Altoona
- Steel Reinforcing Supplies, Altoona
- Stock & Bond Brokers & Dealers, Altoona
- Stocks & Bond Brokers, Altoona
- Store Fixtures & Display Equipment, Altoona
- Store Fronts, Altoona - Storefront
- Stoves & Furnace Equipment, Altoona - Fittings & Repair Parts
- Student Dormitories, Altoona
- Submarine Sandwich Restaurants, Altoona
- Substance Abuse Clinics, Altoona - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Support Services, Altoona
- Surgical Supplies & Equipment, Altoona
- Surgical Supplies, Instruments, Tools & Equipment, Altoona
- Surplus & Salvage Merchandise, Altoona
- Surveyor Services, Altoona - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Altoona
- Swimming Pools Contractors, Altoona - Install Inground - Above Ground Pools
- Swimming Pools Supplies, Equipment & Accessories, Altoona
- Swimwear & Accessories Shops, Altoona - Water Sports Equipment
- Synagogues & Temples, Altoona
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