The various groups of Occupancy Use Groups are detailed in the 2021 International Building Code, Section 302, and includes:

• Assembly: Groups A-1, A-2, A-3, A-4, and A-5 (Section 303)
• Business: Group B (Section 304)
• Educational: Group E (Section 305)
• Factory and industrial: Groups F-1 and F-2 (Section 306)
• High hazard: Groups H-1, H2, H3, H4, and H5 (Section 307)
• Institutional: Group I-1, I-2, I-3, and I-4 (Section 308)
• Mercantile: Group M (Section 309)
• Residential: Groups R-1, R-2, R-3, and R-4 (Section 310)
• Storage: Groups S-1 and S-2 (Section 311)
• Utility and miscellaneous: Group U (Section 312)