You may find industry ratios in the RMA eStatement Studies database. This database provides up to 15 years years of financial ratio benchmarks (FRB) and industry default probabilities (IDP) and cash flow measures for hundreds of industries with an emphasis on large publicly-traded U.S. companies. You may search by industry keyword or by NAICS (North American Industry Classification System) code.

To find an industry's NAICS code, you can visit the US Census Bureau's NAICS resource page

For financial ratios for individual public companies within an industry, search the Morningstar Investing Center  database.