- Safe & Vault, Oakland
- Safe, Lock & Key Repair Services, Oakland - Safes & Vaults Opening & Repair
- Safety & Security Systems & Consultants, Oakland
- Sailing Instructions, Oakland
- Sales & Marketing Consultant, Oakland
- Sales Promotion & Counseling Service, Oakland
- Salvage Yards, Oakland - Auto, Motorcycle, Boat, Trucks, etc
- Salvation Army, Oakland
- Sand Gravel & Aggregate, Oakland
- Sandblasting, Oakland - General Contractors
- Sandwich Shop Restaurants, Oakland
- Satellite & Cable TV Equipment & Systems Repair & Service, Oakland
- Satellite Communication Downlinking & Uplinking, Oakland
- Satellite Descrambling & Programming Service, Oakland
- Satellite Dish Antennas & Equipment Dealers, Oakland
- Satellite TV Service, Oakland
- Savings & Loan Associations, Oakland
- Savings Banks, Oakland
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Oakland
- Scaffolding & Aerial Lifts, Oakland
- Scales Public, Oakland
- Scales Retail, Oakland
- Scanning Service, Oakland
- Scholarships & Financial Aid, Oakland
- Scholarships Grants & Financial Assistance Information, Oakland
- School & College Advisors, Oakland
- School Furniture Manufacturers, Oakland
- Scientific & Laboratory Equipment & Instruments, Oakland
- Scientific & Research Professionals, Oakland
- Scrap & Waste Machinery, Oakland
- Scrap & Waste Materials, Oakland
- Screen Houses, Oakland
- Screen Manufacturers Equipment & Supplies, Oakland
- Screen Printing, Oakland
- Screen Printing Supplies & Equipment, Oakland
- Screens Doors & Windows, Oakland
- Sculptors, Oakland
- Sculptures Retail, Oakland
- Seafood Restaurants, Oakland
- Secondary Schools, Oakland
- Secretarial & Court Reporting Services, Oakland
- Security & Commodity Exchanges, Oakland
- Security & Surveillance System & Equipment, Oakland
- Security Alarm Systems - Home & Business, Oakland
- Security Brokers & Dealers, Oakland
- Security Consultants, Oakland
- Security Control Systems & Monitoring, Oakland - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Oakland - Bodyguard, Guard Dogs, Etc
- Security Investigative Services, Oakland
- Security Services, Oakland
- Seeds & Bulbs Wholesale & Growers, Oakland
- Self Defense Programs, Oakland
- Self Help Groups, Oakland
- Senior Citizens Housing, Oakland
- Senior Citizens Service & Health Organizations, Oakland
- Service Establishment Supplies & Equipment, Oakland
- Sewer & Drain Cleaning & Repair, Oakland - Drain Cleaner & Installation Services
- Sewer Cleaning Equipment & Supplies, Oakland - Sewer Builders
- Sewer Companies, Oakland
- Sewer Construction Contractors, Oakland - Sewer Line, Pipe Installation & Repair Services
- Sewer System Inspection Service, Oakland
- Sewing & Yarn Stores & Supplies, Oakland
- Sewing Contractors, Oakland
- Sewing Machine Repair & Service, Oakland
- Sewing Machines, Equipment & Supplies, Oakland
- Sharpening Service, Oakland
- Sheet Metal, Oakland
- Sheet Metal Contractors, Oakland - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Oakland
- Sheet Metal Work - Aluminum, Tin, Stainless Steel, etc, Oakland - Sheet Metal Products
- Shelving & Shelves, Oakland - Metal, Steel, Wire & Glass Shelving Units & Storage - Wall Shelves
- Shelving Equipment, Oakland
- Ship & Boat Building & Repairing, Oakland
- Ship Chandlers, Oakland
- Shipping Companies, Oakland
- Shirts & T-Shirts, Oakland
- Shock Absorber, Oakland
- Shock Absorbers & Struts, Oakland
- Shoe Dyers, Oakland
- Shoe Repair Shops, Oakland
- Shoe Shining, Oakland
- Shoe Store - More, Oakland
- Shoe Stores, Oakland - Mens, Womens & Kids Shoes
- Shooting & Target Ranges, Oakland
- Shopping & Shopping Services, Oakland
- Shopping Services, Oakland
- Shutters - Interior & Exterior, Oakland - Wood, Vinyl, Window, Plantation Shutters, etc
- Siding Contractors, Oakland - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Siding Materials, Oakland
- Sign Equipment & Supplies, Oakland
- Sign Hanging & Installation Service, Oakland - Signs Erectors & Hangers
- Sign Language & Lip Reading Schools, Oakland
- Sign Products & Services, Oakland
- Signs, Oakland
- Signs & Advertising Specialties Manufacturers, Oakland
- Silk Flowers & Plants Rental & Leasing, Oakland
- Skateboards & Equipment Shops, Oakland - Skateboarding Supplies
- Skating Rink & Hockey Operation Services, Oakland
- Ski Equipment & Supplies Shops, Oakland - Skiing Helmets, Goggles, Clothes, Boots, Gear & Accessories
- Skin Care & Cosmetology Salons, Oakland
- Skin Care Products & Treatments, Oakland
- Sleep Disorders Treatment & Information Centers, Oakland
- Small Appliances, Oakland
- Small Business & Office Equipment Repair Services, Oakland
- Small Business Services, Oakland
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- Smog Check, Brake & Lamp Inspection & Repair, Oakland
- Snack Foods, Oakland
- Snacks & Desserts, Oakland
- Soccer Equipment & Supplies, Oakland
- Social Clubs & Organizations, Oakland
- Social Security And Disability Attorneys & Lawyers, Oakland
- Social Security And Disability Lawyers & Attorneys, Oakland
- Social Security Counselors & Representatives, Oakland
- Social Service Organizations Volunteer Services, Oakland
- Social Services & Welfare, Oakland
- Social Workers & Services, Oakland
- Societies & Foundation Associations, Oakland
- Sod & Sodding Service, Oakland
- Softball Clubs, Oakland
- Soil & Foundation Engineer, Oakland
- Solar Energy Companies - Contractors, Oakland - Solar Panel Installation - Solar Power Systems
- Solar Energy Research Development & Design, Oakland
- Solar Equipment, Oakland
- Solar Products & Services, Oakland
- Sororities, Oakland
- Soul Food Restaurants, Oakland
- Sound Systems & Recording Equipment, Oakland
- Sound Systems, Microphones & Equipment, Oakland
- Soup & Salad Restaurants, Oakland
- South American Restaurants, Oakland
- Southern Style Restaurants, Oakland
- Space Heaters, Oakland
- Space Planning, Oakland
- Special Coatings, Oakland - Protective Coatings
- Special Education & Care, Oakland
- Special Events & Party Supply Rental, Oakland
- Special Interest Schools Or Instruction, Oakland
- Special Needs Transportation, Oakland
- Speciality Food Stores, Oakland
- Specialty Animal Services, Oakland
- Specialty Communication Companies & Services, Oakland
- Specialty Rental Services, Oakland
- Specialty Stores, Oakland
- Speech & Hearing Specialists, Oakland
- Speech Pathologists, Oakland - Speech & Language Therapy
- Spiritualists, Oakland
- Sporting Goods - Other, Oakland
- Sporting Goods Manufacturers, Oakland
- Sporting Goods Stores, Oakland
- Sports & Recreational Services, Oakland
- Sports Bars & Lounges, Oakland
- Sports Clubs, Oakland
- Sports Consultants, Oakland
- Sports Medicine, Oakland - Doctors, Physicians & Surgeons
- Sports Promoters & Managers, Oakland
- Sports Teams & Franchises, Oakland
- Sportswear Clothing Stores, Oakland - Sports Clothes
- Sportswear Manufacturers, Oakland
- Sportswear Wholesale, Oakland
- Springs Coil Flat - Industrial Supply & Equipment, Oakland
- Springs Coil Flat Etcetera Manufacturers, Oakland
- Sprinkler Alarm Systems, Oakland - Fire Sprinkler Systems
- Sprinkler Supervisory Service, Oakland
- Sprinkler System Contractors, Oakland - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Oakland
- Stamp Collecting & Coin Dealers , Oakland
- State Government, Oakland
- Stationery & Office Supplies, Oakland
- Stationery Engravers, Oakland
- Steak House Restaurants, Oakland
- Steam Cleaner - Commercial & Industrial, Oakland - Steam Cleaning - Upholstery, Floor, Carpet, etc
- Steel & Metal Goods, Oakland - Steel Distributors
- Steel Erection Contractors, Oakland - Steel Erectors
- Steel Fabrication & Processing Equipment, Oakland
- Steel Manufacturers, Oakland
- Steel Springs Manufacturers Except Wire, Oakland
- Stock & Bond Brokers & Dealers, Oakland
- Stock Photographers, Oakland
- Stocks & Bond Brokers, Oakland
- Stone And Glass Products, Oakland
- Storage & Closet Equipment Supplies & Materials, Oakland
- Store Fixtures, Oakland
- Store Fixtures & Display Equipment, Oakland
- Stoves & Furnace Equipment, Oakland - Fittings & Repair Parts
- Stoves, Ovens, Ranges & Cooktops, Oakland
- Structural Engineer, Oakland
- Stucco Siding Contractors, Oakland - Stucco Repair & Installation
- Stucco Siding, Granite & Grouting Contractors, Oakland
- Student Housing & Services, Oakland
- Submarine Sandwich Restaurants, Oakland
- Substance Abuse Clinics, Oakland - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Substance Abuse Services, Oakland
- Sufi Church, Oakland
- Sugar Retail, Oakland
- Suicide Prevention Service & Counseling, Oakland
- Support Services, Oakland
- Surgical Hospitals, Oakland - Surgical Centers
- Surplus & Salvage Merchandise, Oakland
- Surveying Engineer, Oakland
- Surveyor Services, Oakland - Surveying Service
- Sushi Restaurants, Oakland
- Swimming Pool, Sauna & Spa Contractors, Oakland
- Swimming Pools & Equipment Manufacturers, Oakland
- Swimming Pools Contractors, Oakland - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Oakland
- Swimming Pools Supplies, Equipment & Accessories, Oakland
- Swimming Pools, Hot Tubs & Spas Rental & Leasing, Oakland
- Swimwear & Accessories Shops, Oakland - Water Sports Equipment
- Synagogues & Temples, Oakland
- Szechuan Restaurants, Oakland
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