LWhy are Some SIC Code lists 8-Digit and Others 4 Digits?
Category:Common SIC Questions
U.S. SIC Codes are defined at the four digit level. Eight-digit SIC Codes are not official U.S. governmentSIC codes, therefore, historical statistical data cannot be found for any SIC Code beyond the four-digit level via government sources. Six, seven and eight-digit codes have been created by private data companies to help further classify industries for marketing and identification purposes.
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