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National Classifications


Country / Area: United States of America

Classification category: Activity classifications

General information
1 (b)In which language(s) is the classification available?There are differences between the NAICS and ISIC classification schemes. Most important, perhaps, is the single (production process) conceptual framework of NAICS.
1 (c)Can the classification (or information about it) be accessed on the Internet? If yes, please provide the URL.
20 sectors (2-digit)17 Sections (A thru Q)
100 Subsectors60 Divisions (2-digit)
317 Industry Groups (4 digit)159 Groups (3-digit)
725 NAICS Industries (5-digit)
3 Country Agreement
1179 U.S. Industries
(No.3-Country Agreements)
292 Classes (4-digit)

NAICS was developed jointly by the U.S., Mexico and Canada, with the most detailed 6-digit level used for national detail.

Classification structure
2 (a)Please describe the structure of the classification: How many levels does the classification have? (Please provide labels, such as “Division”, “Class”) How many categories exist at each level?There are 1179 industries at the most detailed (U.S. industry) level.
2 (b)Please provide examples of the coding system used at each level.Tables linking a NAICS industry to a parent ISIC are used to convert our annual data from NAICS to ISIC so that the U.N. can publish their data. The United States, Canada, Mexico, U.N., and Eurostat are currently developing a NACE-NAICS concordance, to which the ISIC links will be added by the U.N.
Relationship to international standards
3 (a)Is this classification based on (or linked to) an international standard classification? If yes, please describe.The ECPC (Economic Classification Policy Committee)
Office of Management and Budget-Statistical Policy Branch
New Executive Office Building
Washington, DC 20503
3 (b)Is the classification structure identical to the international standard or, if not, how does it differ? (e.g. have additional levels been added to the international standard or have changes been made within the level of the international structure, such as aggregations or additional breakdowns)John Burns Murphy
Chairperson, ECPC
Tel.: (301) 457-2672
3 (c)Please describe deviations from the international standard (in terms of structure, methodology or application rules). Please use examples, if a general statement is not possible.DR. NAICS (go to Bureau of Census Website http://www.census.gov/naics or dial 1-888-756-2427).
3 (d)At what level of the international standard can data be reported for international comparison? (Please provide examples of programmes / indicators if reporting takes place at different levels of the classification.)"NAICS" was adopted on January 07, 1997. NAICS was first used in the Bureau of Census 1997 Economic Census. Other U.S. statistical agencies are implementing NAICS within their programs on varying schedules through 2004.
3 (e)If no links to international classifications exist or no international standard is used, please state if there are plans to use international norms in the future.The first major revisions were implemented in 2002. The second major revision is planned to be implemented in 2007. NAICS was designed to accommodate revisions every 5 years.
Classification uses
4 (a)Please state for which statistical purposes (surveys etc.) this classification is used and if there are users outside of the Statistical Office. Please indicate at which level the classification is used for data collection and for data publishing.Statistical agencies such as the Bureau of Census and Bureau of Labor Statistics use NAICS for the collection, tabulation, and publication of economic statistics. In both agencies, the universe files of business establishments are converted to a NAICS basis. The Bureau of Economic Analysis uses the NAICS-based data in developing the national input-output tables, and for calculation of the GDP. Other U.S. statistical agencies such as the Internal Revenue Service have implemented NAICS and all other Federal agencies are implementing NAICS over time.
4 (b)Please give the names of institutions that use the classification for non-statistical purposes (as opposed to statistical purposes in question 4(a)). Also indicate the kind of use (e.g. tax offices, social security, customs, enterprise register, employment services, work permits etc.)The Bureau of Census Economic Censuses have used NAICS codes since the 1997 Economic Censuses. Since the 1997 data were published using both SIC and NAICS formats, historic analysis should not be a problem. Census took the manufacturing and mining data and published the data at a product level detail and also expanded the rest of the codes into additional statistical breaks. Other U.S. statistical agencies are implementing NAICS on varying schedules through 2004. The Bureau of Census is now rolling out NAICS implementation within its economic survey programs.
4 (c)Please indicate if alternative classifications are used by other institutions of the economy. Are these classifications available and useful for the Statistical Office?The U.S. National Accounts are perhaps the most important NAICS- based data along with the Bureau of Census Economic Census data.
Implementation / revision status
5 (a)Please state the date of the official adoption of the classification. If not yet adopted, please indicate the current state (e.g. in development, sent for approval, in printing, ready to be distributed etc.)The U.S. NAICS is in English only. The Canadian NAICS, with Canadian 6-digit detail, was translated from English to French. The Mexican NAICS was written in Spanish.
5 (b)Please state the date of use of the classification for individual statistical programmes.Yes, the classification is available on a CD-ROM.
5 (c)Are there existing plans for revision or update of the current classification?The conversion from NAICS to ISIC currently exists only as internal databases, so our data can be converted for U.N. acceptance.
5 (d)Name of former (previous) national classification (full name in both national tongue and in English with acronyms in brackets, should be given)Even though NAICS to ISIC conversions, along with some explanatory notes have been completed, they will not be finalized until the European NACE has also been converged.
5 (e)Please describe the link of the former classification to international classificationsIncomplete reference files; changes in self- identification definitions (i.e. wholesale or retail); new sectors with changing profiles, such as the Information.
5 (f)Please describe the structure of the former classification and indicate the number of items at each level of the classification. (similar to question 2(a))The U.N. may act as arbitrator when interpreting ISIC codes; and organizing international convergences between NAICS and other country codes.
5 (g)Do conversion tables exist between the former and current classification?IRS, SSA, EPA (regulatory), SBA (business loans), GSA (contracts). Sorting and organizing vendor files or business dealings using the NAICS code is of greatest importance. Business searches (using codes) are far simpler.
5 (h)When was the former classification implemented?SIC codes will continue to be used by some institutions until all agencies have converted to NAICS.
5 (i)Are statistical data still collected or published according to the former classification? Please indicate if this statistical data is collected or published by the Statistical Office or elsewhere.SIC to NAICS conversions are found in the back of the NAICS manuals and on this Internet site: http://www.census.gov/naics; and on the NAICS CD-ROM. Other codes like the Federal Supply Code, may simply be eliminated.
Supporting documents
6 (a)Have national explanatory notes and/or guidelines been elaborated?1987 Standard Industrial Classification Manual (SIC)
6 (b)Do correspondence tables exist between the national and the international classifications (if applicable)?SIC to ISIC is available both electronically and in the International Concordances, which also includes NACE.
6 (c)Are correspondence tables between alternative and current classification available (if applicable)?SIC
Section Codes (Alpha)
Division Codes (2 digit)
Industry Group Codes (3 digit)
Industry Codes (4 digit)
6 (d)Does a national coding index exist?There are 1004 industries at the most detailed level of the SIC.
6 (e)Is the classification available in electronic form? If yes, in which formats is it available?(e.g. PDF, TXT, Excel, XML)SIC to NAICS conversions are found in the back of the NAICS manuals and on this Internet site: http://www.census.gov/naics; and on the NAICS CD-ROM. Other codes like the Federal Supply Code, may simply be eliminated.
6 (f)Are the correspondence tables or indexes available in electronic form?1987
Contact information
7 (a)Name of institution / office responsible for the development and maintenance of the classificationMost marketing research data are published and researched using SIC. The Bureau of Labor Statistics is gradually converting to NAICS 2002. Some programs at other agencies are still on an SIC-basis until NAICS is fully implemented.
7 (b)Contact address, phone number, e-mail or website for public information and inquiryNorth American Industry Classification System (NAICS).

Source: UN questionnaire, 4/1/2003