Definition of SIC CODES authored by Gary Klein
Standard Industrial Classification Codes (SIC Codes) and North American Industry Classification System (NAISC Codes) are numerical codes designed by the U.S. Government in order to create uniform descriptions of business establishments.
NAICS and SIC codes can be used to bring together information about companies that produce similar products or services. For instance, if you grow oranges on your farm, your neighbor grows lemon trees, and someone else cultivates limes, all of these activities are described by SIC Code #0174, "establishments primarily engaged in the production of citrus fruits."
NAICS and SIC Codes are arranged in a very structured, hierarchical manner.
NAICS and SIC codes are widely used throughout the large number of Economics Censuses that have been produced for decades by the U.S. Census Bureau, and by other economic analysis units of the Federal government.
Unfortunately, there is not an automatic nor consistant method to "translate" a 4 digit SIC code into the newer 6 digit NAICS coding system.
With more digits behind each NAICS code, the newer system allows for more fine tuning of an industry its components, and sub-components. The basic principal of bringing things together under a single SIC or NAICS code is an analysis of the industrial process that takes place at each particular business establishment, as a product moves from a raw material stage, into a final product that is purchased for consumption or use..
Whenever you see the number 9, you should be aware that you are veery into a fuzzy area which has put several different odd things into one cluster.
When the right most digits of a NAICS code ends in 99, you are dealing with a lot of miscellaneous things which are officially described as "not elsewhere classified".
The current version of NAICS for 2012 is fully searchable, both by words and by code numbers = https://www.census.gov/cgi-bin/sssd/naics/naicsrch?chart=2012
Here is a quick guide to the major sectors of NAICS Code Numbers:
|11||Agriculture, Forestry, Fishing and Hunting|
|21||Mining, Quarrying, and Oil and Gas Extraction|
|31 - 33||Manufacturing|
|44 - 45||Retail Trade|
|48 - 49||Transportation and Warehousing|
|52||Finance and Insurance|
|53||Real Estate, Rental, and Leasing|
|54||Professional, Scientific and Technical Services|
|55||Management of Companies and Employees|
|56||Administrative and Support and Waste Management and Remediation Services|
|62||Health Care and Social Assistance|
|71||Arts, Entertainment and Recreatoin|
|72||Accommodation and Food Services|
|81||Other Services (except Public Administration)|