- Safety & Security Systems & Consultants, Herndon
- Sales & Marketing Consultant, Herndon
- Sand Gravel & Aggregate, Herndon
- Sandwich Shop Restaurants, Herndon
- Satellite & Cable TV Equipment & Systems, Herndon
- Satellite Communication Downlinking & Uplinking, Herndon
- Satellite Descrambling & Programming Service, Herndon
- Satellite Dish Antennas & Equipment Dealers, Herndon
- Satellite Technology & Space Research, Herndon
- Satellite TV Service, Herndon
- Savings & Loan Associations, Herndon
- Savings Banks, Herndon
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Herndon
- School & College Advisors, Herndon
- School - Catholic, Herndon
- School - Christian, Herndon
- Science & Research, Herndon
- Scientific & Laboratory Equipment & Instruments, Herndon
- Screen Printing, Herndon
- Seafood Restaurants, Herndon
- Secondary Schools, Herndon
- Security & Surveillance System & Equipment, Herndon
- Security Alarm Systems - Home & Business, Herndon
- Security Brokers & Dealers, Herndon
- Security Control Systems & Monitoring, Herndon - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Herndon - Bodyguard, Guard Dogs, Etc
- Security Investigative Services, Herndon
- Security Services, Herndon
- Senior Citizens Service & Health Organizations, Herndon
- Septic Tank Installation & Repair, Herndon - Septic Systems
- Septic Tank Pumping & Cleaning, Herndon - Septic Systems
- Septic Tanks & Septic Systems Contractors, Herndon - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Herndon - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Herndon - Sewer Line, Pipe Installation & Repair Services
- Sewing & Yarn Stores & Supplies, Herndon
- Sheet Metal Contractors, Herndon - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Herndon
- Sheet Metal Work Equipment & Supplies, Herndon
- Shipping Companies, Herndon
- Shipping Masters, Herndon
- Shoe Store - More, Herndon
- Shoe Stores, Herndon - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Herndon
- Siding Contractors, Herndon - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Sign Equipment & Supplies, Herndon
- Sign Hanging & Installation Service, Herndon - Signs Erectors & Hangers
- Sign Products & Services, Herndon
- Signs, Herndon
- Signs Magnetic, Herndon
- Silicones & Silicone Products, Herndon
- Skin Care & Cosmetology Salons, Herndon
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- Skin Care Products & Treatments, Herndon
- Sleep Disorders Treatment & Information Centers, Herndon
- Sleep Doctors, Herndon - Specialists, Physicians & Surgeons (Sleep Medicine)
- Small Appliances, Herndon
- Small Business & Office Equipment Repair Services, Herndon
- Snacks & Desserts, Herndon
- Snow Removal Services, Herndon - Snow Plow Service
- Soccer Clubs, Herndon
- Soccer Facilities, Herndon
- Social Clubs & Organizations, Herndon
- Social Services & Welfare, Herndon
- Social Workers & Services, Herndon
- Societies & Foundation Associations, Herndon
- Soul Food Restaurants, Herndon
- South American Restaurants, Herndon
- Special Education & Care, Herndon
- Special Interest Schools Or Instruction, Herndon
- Specialty Animal Services, Herndon
- Specialty Stores, Herndon
- Speech & Hearing Disorders - Information & Referral Service, Herndon
- Speech & Hearing Specialists, Herndon
- Speech Pathologists, Herndon - Speech & Language Therapy
- Sporting & Recreational Camps, Herndon
- Sporting Goods Stores, Herndon
- Sports & Recreational Services, Herndon
- Sports Bars & Lounges, Herndon
- Sports Clubs, Herndon
- Sports Promoters & Managers, Herndon
- Sports Promotions & Special Events, Herndon
- Staffing & Support Services, Herndon
- State Government, Herndon
- Stationery & Office Supplies, Herndon
- Steak House Restaurants, Herndon
- Steel & Metal Goods, Herndon - Steel Distributors
- Stereo, Audio & Video Equipment Dealers & Stores, Herndon
- Stocks & Bond Brokers, Herndon
- Storage & Closet Equipment Supplies & Materials, Herndon
- Stove, Oven, Range & Cooktop Parts & Supplies, Herndon
- Structural Engineer, Herndon
- Submarine Sandwich Restaurants, Herndon
- Substance Abuse Clinics, Herndon - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Summer Camps, Herndon
- Surveyor Services, Herndon - Surveying Service
- Sushi Restaurants, Herndon
- Swimming, Herndon
- Swimming Lessons & Classes, Herndon
- Swimming Pool, Sauna & Spa Contractors, Herndon
- Swimming Pools, Herndon
- Swimming Pools Contractors, Herndon - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Herndon
- Swimming Pools Supplies, Equipment & Accessories, Herndon
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