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Every industry is assigned a four-digit SIC code, so all companies in the same industry will have the same code. A company may have more than one SIC code if they are in different segments of industry, but usually only one or two are considered the primary SIC codes.
The NAICS system of six-digit numbers is replacing the SIC system. Many of our business databases, such as Business & Company Resource Center, will list the codes for a particular company or industry.
Getting reliable statistics on a company's competitors or industry is an important part of determining the financial standing of any company. The following sources may help: