Sources for industry ratios include RMA's Statement Studies, Mergent D&B Manuals: Key Business Ratios, and S&P Global NetAdvantage.
You can sort ratios by Assets or by Sales.
The North American Industry Classification System (NAICS) is used to organize industry information. It's designed to produce common industry definitions for Canada, Mexico, and the United States. It is a hierarchical classification system, offering five levels of detail. Codes are assigned to an industry based on products and services provided by the industry.
Industries are represented by a six-digit number. The first two digits designate the economic sector: manufacturing, agriculture, wholesale, retail, professional services, etc. The subsequent digits designate subsectors and industry groups.
Each digit in the code is part of a series of progressively narrower categories.
44 - Retail
448 - Clothing and Clothing Accessories Stores
4481 - Clothing Stores
448140 - Family Clothing Stores
The Standard Industrial Classification (SIC), an earlier U.S. system, is still used by some sources.