- Safety & Security Systems & Consultants, Merrillville
- Safety Equipment & Supplies, Merrillville
- Sales & Marketing Consultant, Merrillville
- Salvage Yards, Junk Yards & Wrecker Service, Merrillville
- Sandwich Shop Restaurants, Merrillville
- Sanitary District Offices, Merrillville
- Sanitary Engineers, Merrillville
- Satellite & Cable TV Equipment & Systems Repair & Service, Merrillville
- Satellite Dish Antennas & Equipment Dealers, Merrillville
- Satellite TV Service, Merrillville
- Savings & Loan Associations, Merrillville
- Savings Banks, Merrillville
- Scaffolding & Aerial Lifts, Merrillville
- Screen Printing, Merrillville
- Seafood Restaurants, Merrillville
- Secondary Schools, Merrillville
- Secretarial & Court Reporting Services, Merrillville
- Security & Surveillance System & Equipment, Merrillville
- Security Alarm Systems - Home & Business, Merrillville
- Security Brokers & Dealers, Merrillville
- Security Control Systems & Monitoring, Merrillville - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Merrillville - Bodyguard, Guard Dogs, Etc
- Security Investigative Services, Merrillville
- Security Services, Merrillville
- Senior Citizens Service & Health Organizations, Merrillville
- Septic Tank Installation & Repair, Merrillville - Septic Systems
- Septic Tank Pumping & Cleaning, Merrillville - Septic Systems
- Septic Tanks & Septic Systems Contractors, Merrillville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Service Establishment Supplies & Equipment, Merrillville
- Sewer & Drain Cleaning & Repair, Merrillville - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Merrillville - Sewer Line, Pipe Installation & Repair Services
- Sewing & Yarn Stores & Supplies, Merrillville
- Sewing Machine Repair & Service, Merrillville
- Shoe Dyers, Merrillville
- Shoe Repair Shops, Merrillville
- Shoe Store - More, Merrillville
- Shoe Stores, Merrillville - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Merrillville
- Siding Contractors, Merrillville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Siding Materials, Merrillville
- Signs, Merrillville
- Skin Care & Cosmetology Salons, Merrillville
- Skin Care Products & Treatments, Merrillville
- Sleep Doctors, Merrillville - Specialists, Physicians & Surgeons (Sleep Medicine)
- Small Appliances, Merrillville
- Snack Foods, Merrillville
- Snacks & Desserts, Merrillville
- Snow Removal Equipment Repair & Service, Merrillville
- Social & Human Services Autism Services, Merrillville
- Social Security And Disability Attorneys & Lawyers, Merrillville
- Social Security And Disability Lawyers & Attorneys, Merrillville
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- Social Security Counselors & Representatives, Merrillville
- Social Services & Welfare, Merrillville
- Social Workers & Services, Merrillville
- Societies & Foundation Associations, Merrillville
- Southern Style Restaurants, Merrillville
- Special Education & Care, Merrillville
- Special Events & Party Supply Rental, Merrillville
- Special Interest Schools Or Instruction, Merrillville
- Special Needs Transportation, Merrillville
- Speciality Food Stores, Merrillville
- Specialty Animal Services, Merrillville
- Specialty Stores, Merrillville
- Speech & Hearing Specialists, Merrillville
- Sporting Goods Equipment Rental, Merrillville
- Sporting Goods Manufacturers, Merrillville
- Sporting Goods Stores, Merrillville
- Sports Bars & Lounges, Merrillville
- Sportswear Clothing Stores, Merrillville - Sports Clothes
- Sportswear Manufacturers, Merrillville
- Sportswear Wholesale, Merrillville
- Spraying Booths & Equipment, Merrillville
- Staffing & Support Services, Merrillville
- Stamp Collecting & Coin Dealers , Merrillville
- State Government, Merrillville
- Stationery & Office Supplies, Merrillville
- Steak House Restaurants, Merrillville
- Steel & Metal Goods, Merrillville - Steel Distributors
- Steel Detailers, Merrillville
- Steel Manufacturers, Merrillville
- Steel Mills & Blast Furnaces, Merrillville
- Steel Work Contractors, Merrillville
- Stock & Bond Brokers & Dealers, Merrillville
- Stocks & Bond Brokers, Merrillville
- Storage & Closet Equipment Supplies & Materials, Merrillville
- Storm Windows & Doors Installation & Repair, Merrillville
- Stoves & Furnace Equipment, Merrillville - Fittings & Repair Parts
- Structural Steel Erection, Merrillville
- Submarine Sandwich Restaurants, Merrillville
- Substance Abuse Clinics, Merrillville - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Support Services, Merrillville
- Surgical Hospitals, Merrillville - Surgical Centers
- Surveying Engineer, Merrillville
- Surveyor Services, Merrillville - Surveying Service
- Surveyors, Merrillville
- Sushi Restaurants, Merrillville
- Swimming Pool, Sauna & Spa Contractors, Merrillville
- Swimming Pools & Equipment Manufacturers, Merrillville
- Swimming Pools Contractors, Merrillville - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Merrillville
- Swimming Pools Supplies, Equipment & Accessories, Merrillville
- Swimwear & Accessories Shops, Merrillville - Water Sports Equipment
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