- Sandwich Shop Restaurants, Ambridge
- School Bus Transportation, Ambridge
- School Bus Transportation Service, Ambridge
- Seafood Restaurants, Ambridge
- Secondary Schools, Ambridge
- Secretarial & Court Reporting Services, Ambridge
- Security Alarm Systems - Home & Business, Ambridge
- Security Control Systems & Monitoring, Ambridge - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Ambridge - Bodyguard, Guard Dogs, Etc
- Security Services, Ambridge
- Septic Tank Installation & Repair, Ambridge - Septic Systems
- Septic Tank Pumping & Cleaning, Ambridge - Septic Systems
- Septic Tanks & Septic Systems Contractors, Ambridge - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewage Plant Operation, Ambridge
- Sewer & Drain Cleaning & Repair, Ambridge - Drain Cleaner & Installation Services
- Shipping Terminals, Ambridge
- Shopping & Shopping Services, Ambridge
- Siding Contractors, Ambridge - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Ambridge
- Small Appliances, Ambridge
- Smoked Meat Restaurants, Ambridge
- Snack Foods, Ambridge
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- Snow Removal Services, Ambridge - Snow Plow Service
- Social Security And Disability Attorneys & Lawyers, Ambridge
- Social Security And Disability Lawyers & Attorneys, Ambridge
- Social Services & Welfare, Ambridge
- Societies & Foundation Associations, Ambridge
- Special Interest Schools Or Instruction, Ambridge
- Special Needs Transportation, Ambridge
- Specialty Stores, Ambridge
- Sporting Goods Stores, Ambridge
- Sprinkler System Contractors, Ambridge - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Ambridge
- State Government, Ambridge
- Steel & Metal Goods, Ambridge - Steel Distributors
- Steel Detailers, Ambridge
- Steel Manufacturers, Ambridge
- Steel Mills & Blast Furnaces, Ambridge
- Steel Work Contractors, Ambridge
- Stereo, Audio & Video Equipment Dealers & Stores, Ambridge
- Stoves & Furnace Equipment, Ambridge - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Ambridge
- Synagogues & Temples, Ambridge
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