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There are a few ways you can go about discovering an Industry NAICS code.
The easiest way to do so is to visit the Census' NAICS page. You can then either do a keyword search for your industry on the left hand side of the screen, or you can browse the Classification system by clicking on the reference files (also on the left).
Please be aware that newer industries may not have a NAICS code. Social Networking sites, for example, were only recently added to the 2017 NAICS, and were not previously a recognized industry.
31-33 = Manufacturing
3113 = Sugar and Confectionery Product Manufacturing
311340 = Nonchocolate Confectionery Manufacturing
These codes help you to identify competitors, and they can help you find resources that will tell you more about your company's industry.
These codes are used throughout many of the databases that you will be using for this assignment.
Standard Industrial Classification (SIC) codes are four-digit numerical codes assigned by the U.S. government to business establishments to identify the primary business of the establishment. The classification was developed to facilitate the collection, presentation and analysis of data; and to promote uniformity and comparability in the presentation of statistical data collected by various agencies of the federal government, state agencies and private organizations.