Industry codes (NAICS, SIC) are hierarchic, numeric schemes to define and distinguish one industry from another:
About Industry Classification Codes
Look at trade journals, i.e. journals published by industry associations, association websites, industry/investment analysts’ reports, nonprofit and government information sources such as EPA Industry Letters, EIA reports, Economic Census, market research reports, and commercial industry reports.
US Census Bureau Economic Survey is a detailed census of US economic activity conducted every 5 years. The latest census was done in 2022, and first summary results for nationwide counts are now available. Select First Look statistics. Detailed geographic level data will be available in late 2024 into 2025.
Links to principal federal statistics agencies, eg. Census of Agriculture, Health statistics, Crime statistics, etc.
Data.gov - Search across all federal statistical agency datasets.
Statistical Abstracts from 1879-2010 available here.
Links to Statistical Agencies (US agencies, national agencies of other countries, and International)
US Census Bureau’s provides composite quarterly ratios for manufacturing, mining, wholesale and service industries.
RMA Annual Statement Studies. Financial Ratio Benchmarks. AnnualBased on financial statements submitted to banks, composite financial and operating ratios for mfg., wholesale, retail, service industries. 750+ lines of business are covered. Upper quartile, median and lower quartile values are presented. Explanations of balance sheet and income data, definitions of ratios, and sources of financial information for industries not covered.
Almanac of Business and Industrial Financial Ratios. Compiled from tax returns submitted to the
Industry Norms and Key Business Ratios. Financial and operating ratios for 800 lines of business. Balance sheet and income statement information and 14 financial ratios. More lines of business covered.