The North American Industry Classification System (NAICS) is the standard used by Federal statistical agencies in classifying business establishments for the purpose of collecting, analyzing, and publishing statistical data related to the U.S. business economy.
Search for the NAICS code for the industry you are researching at https://www.census.gov/naics/ or in ReferenceUSA.
Search with the NAICS code in BizMiner and IBISWorld for best results.