There are 31 different GSA Schedules, or main product / service categories. Each GSA Schedule has numerous subcategories called Special Item Numbers (SINs).

GSA Schedule Description
520 Financial and Business Solutions (FABS)
874 Mission Oriented Business Integrated Services (MOBIS)
871 Professional Engineering Services (PES)
738 II Language Services
899 Environmental Services
874 V Logistics Worldwide (LOGWORLD)
00CORP Consolidated Schedule
70 General Purpose Commercial Information Technology Equipment, Software, and Services
56 Buildings and Building Materials/Industrial Services and Supplies
73 Food Service, Hospitality, Cleaning Equipment and Supplies, Chemicals, and Services
84 Total Solutions for Law Enforcement, Security, Facility Management Systems, Fire, Rescue, Special Purpose Clothing, Marine Craft and Emergency/Disaster Response
541 Advertising & Integrated Marketing Solutions (AIMS)
736 Temporary Administrative and Professional Staffing Services (TAPS)
66 Scientific Equipment and Services
51 V Hardware SuperStore
03FAC Facilities Maintenance and Management
738 x Human Resources and EEO Services
75 Office Products/Supplies and Services and New Products/Technology
67 Photographic Equipment—Cameras, Photographic Printers and Related Supplies and Services
76 Publication Media
81 IB Shipping, Packaging and Packing Supplies—Bags, Sacks, Cartons, Crates, Packaging and Packing Bulk Material
58 I Professional Audio/Video, Telemetry/Tracking, Recording/Reproducing, and Signal Data Solutions
71 Furniture
71 IIK Comprehensive Furniture Management Services
72 Furnishings and Floor Coverings
36 The Office, Imaging and Document Solutions—Office Equipment Products and Services, and Document Management Products and Services
78 Sports, Promotional, Outdoor, Recreational, Trophies, and Signs (SPORTS)
23 V Vehicular Multiple Award Schedule (VMAS)
751 Leasing of Automobiles and Light Trucks
48 Transportation, Delivery and Relocation Solutions (TDRS)
599 Travel Services Solutions