- Sand Gravel & Aggregate, Northumberland
- Sandwich Shop Restaurants, Northumberland
- Satellite & Cable TV Equipment & Systems, Northumberland
- Satellite TV Service, Northumberland
- School - Christian, Northumberland
- Screen Printing, Northumberland
- Senior Citizens Service & Health Organizations, Northumberland
- Septic Tank Installation & Repair, Northumberland - Septic Systems
- Septic Tank Pumping & Cleaning, Northumberland - Septic Systems
- Septic Tanks & Septic Systems Contractors, Northumberland - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer Construction Contractors, Northumberland - Sewer Line, Pipe Installation & Repair Services
- Shirts & T-Shirts, Northumberland
- Shopping & Shopping Services, Northumberland
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- Signs, Northumberland
- Snow Removal Services, Northumberland - Snow Plow Service
- Social Services & Welfare, Northumberland
- Sound Systems, Microphones & Equipment, Northumberland
- Specialty Stores, Northumberland
- Sporting Goods Stores, Northumberland
- Sports & Recreational Services, Northumberland
- Sportswear Clothing Stores, Northumberland - Sports Clothes
- State Government, Northumberland
- Support Services, Northumberland
- Swimming, Northumberland
- Swimming Pools, Northumberland
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Northumberland
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