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What are SIC Codes and NAICS Codes?

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SIC Codes and NAICS Codes Defined

SIC stands for Standard Industrial Classification and NAICS stands for North American Industry Classification System. These are commonly used industry codes in the US, Canada, and Mexico. These universal numbering methods help identify the industry affiliation of a company. Dun & Bradstreet provides both codes in its business information products, such as company profiles in D&B Hoovers and business credit reports in D&B Credit.

What Is a SIC Code?

Standard Industrial Classification codes were developed by the federal government in conjunction with the US business community during the 1930's. SIC codes have been proven to be a useful tool for professionals looking to segment domestic markets, analyze customer relationships, and conduct general business research.

SIC codes divide all major economic activity into 10 major divisions. The first two digits describe the nature of this activity in very general terms (i.e. Mining, Construction, Manufacturing). Remaining digits break down these categories into specific products and sub-industries.

In a Dun & Bradstreet company profile or business credit report, if more than one SIC code is assigned to a company, the first one listed is the primary line of business. The remaining codes, if any, comprise at least 10% of the firm's annual revenue.

SIC Code Lookup - List of SIC Codes
01-09 Agriculture, Forestry, And Fishing
01 Agricultural Production Crops
02 Agricultural Production Livestock and Animal Specialties
07 Agricultural Services
08 Forestry
09 Fishing, Hunting, and Trapping
10-14 Mining
10 Metal Mining
12 Coal Mining
13 Oil and Gas Extraction
14 Mining and Quarrying of Nonmetallic Minerals, Except Fuels
15-17 Construction
15 Building Construction-General Contractors and Operative Builders
16 Heavy Construction Other Than Building Construction-Contractors
17 Construction-Special Trade Contractors
20-39 Manufacturing
20 Food and Kindred Products
21 Tobacco Products
22 Textile Mill Products
23 Apparel and Other Finished Products Made From Fabrics and Similar Material
24 Lumber and Wood Products, Except Furniture
25 Furniture and Fixtures
26 Paper and Allied Products
27 Printing, Publishing, and Allied Industries
28 Chemicals and Allied Products
29 Petroleum Refining and Related Industries
30 Rubber and Miscellaneous Plastics Products
31 Leather and Leather Products
32 Stone, Clay, Glass, and Concrete Products
33 Primary Metal Industries
34 Fabricated Metal Products, Except Machinery and Transportation Equipment
35 Industrial and Commercial Machinery and Computer Equipment
36 Electronic and Other Electrical Equipment and Components, Except Computer
37 Transportation Equipment
38 Measuring, Analyzing and Controlling Instruments; Photographic, Medical
and Optical Goods; Watches and Clocks
39 Miscellaneous Manufacturing Industries
40-49 Transportation, Communications, Electric, Gas, And Sanitary Services
40 Railroad Transportation
41 Local and Suburban Transit and Interurban Highway Passenger Transportation
42 Motor Freight Transportation and Warehousing
43 United States Postal Service
44 Water Transportation
45 Transportation By Air
46 Pipelines, Except Natural Gas
47 Transportation Services
48 Communications
49 Electric, Gas, and Sanitary Services
50-51 Wholesale Trade
50 Wholesale Trade: Durable Goods
51 Wholesale Trade: Nondurable Goods
52-59 Retail Trade
52 Building Materials, Hardware, Garden Supply, and Mobile Home Dealers
53 General Merchandise Stores
54 Food Stores
55 Automotive Dealers and Gasoline Service Stations
56 Apparel and Accessory Stores
57 Home Furniture, Furnishings, and Equipment Stores
58 Eating and Drinking Places
59 Miscellaneous Retail
60-67 Finance, Insurance, and Real Estate
60 Depository Institutions
61 Nondepository Credit Institutions
62 Security and Commodity Brokers, Dealers, Exchanges, and Services
63 Insurance Carriers
64 Insurance Agents, Brokers, and Service
65 Real Estate
67 Holding and Other Investment Offices
70-89 Services
70 Hotels, Rooming Houses, Camps, and Other Lodging Places
72 Personal Services
73 Business Services
75 Automotive Repair, Services, and Parking
76 Miscellaneous Repair Services
78 Motion Pictures
79 Amusement and Recreation Services
80 Health Services
81 Legal Services
82 Educational Services
83 Social Services
84 Museums, Art Galleries, and Botanical and Zoological Gardens
86 Membership Organizations
87 Engineering, Accounting, Research, Management, and Related Services
88 Private Households
89 Services, not elsewhere classified
90-99 Public Administration
91 Executive, Legislative, and General Government, Except Finance
92 Justice, Public Order, and Safety
93 Public Finance, Taxation, and Monetary Policy
94 Administration of Human Resource Programs
95 Administration of Environmental Quality And Housing Programs
96 Administration of Economic Programs
97 National Security and International Affairs
99 Nonclassifiable Establishments

What Is a NAICS Code?

The North American Industry Classification System (NAICS) was introduced in 1987 as a replacement for SIC codes and now serves as the standard for the three NAFTA countries of Mexico, Canada and the US.

Developed at the urging of leading business economists, NAICS (pronounced "nakes") offers classifications that more closely reflect the many new industries that have re-shaped the US and global economy. NAICS differs from SIC in that it focuses on business processes rather than on end products. NAICS also captures many service industries currently underrepresented in the SIC system.

There are hundreds of NAICS codes, once they are expanded into 4-, 5-, and 6-digit level. Here is a list of the main 2-digit NAICS categories:

11 Agriculture, Forestry, Fishing and Hunting
21 Mining, Quarrying, and Oil and Gas Extraction
22 Utilities
23 Construction
31-33 Manufacturing
42 Wholesale Trade
44-45 Retail Trade
48-49 Transportation and Warehousing
51 Information
52 Finance and Insurance
53 Real Estate and Rental and Leasing
54 Professional, Scientific, and Technical Services
55 Management of Companies and Enterprises
56 Administrative and Support and Waste Management and Remediation Services
61 Educational Services
62 Health Care and Social Assistance
71 Arts, Entertainment, and Recreation
72 Accommodation and Food Services
81 Other Services (except Public Administration)
92 Public Administration

Like the SIC code, NAICS is organized into hierarchical classification groups that build from the detailed industry level. The United States, Canada and Mexico share the first five digits within the NAICS structure. The sixth digit is designed for country specific classifications and may differ from one nation to the next. However, the three countries have agreed to use many of the same six-digit designations.

While SIC codes are still widely used, the federal government no longer supports and maintains this system.

How Are Industry Codes Used?

Industry codes are used for a variety of business and economic purposes that depend on accurate data to make informed decisions. Industry analysis is helpful for both sales and marketing and for risk management. Sales and marketing professionals can use industry codes for prospecting and lead generation. For example, companies might prospect for new customers in a particular geographic location and a particular industry, such as medical distributors in California. This type of targeting by industry can yield more precision for sales and marketing campaigns. Similarly, finance professionals can group their customers by industry and payment behavior to better understand which types of businesses may present a higher or lower level of risk.

Popular Industry Codes

Restaurant SIC Codes + NAICS Codes for Restaurants

Companies in this industry sector operate restaurants and other eating places, including full-service restaurants (FSRs), quick-service restaurants (QSRs), cafeterias and buffets, and snack bars. Altogether, there are about 775,000 companies with SIC and NAICS codes for restaurants in the US, according to Dun & Bradstreet. For more analysis on the restaurant industry, see D&B Hoovers industry insights for restaurants, bars, and food services.

SIC codes for restaurants:
5812 Eating places
NAICS codes for restaurants:
722511 Full-Service Restaurants
722513 Limited-Service Restaurants
22514 Cafeterias, Grill Buffets, and Buffets
722515 Snack and Nonalcoholic Beverage Bars

Construction SIC Codes + NAICS Codes for Construction

Construction companies include residential and nonresidential builders such as industrial plants and commercial and institutional facilities. Heavy construction and civil engineering companies build highways, streets, and bridges; utility systems; and land subdividers. Altogether, there are about 660,000 companies with SIC and NAICS codes for the construction sector in the US, according to Dun & Bradstreet. For more analysis on the construction industry and for a complete list of SIC codes and NAICS codes, see D&B Hoovers insights for nonresidential building construction.

SIC Codes for Construction:
1521 Single-family housing construction
1522 Residential construction, nec (not elsewhere classified)
1531 Operative builders
1541 Industrial buildings and warehouses
1389 Oil and gas field services, nec
1611 Highway and street construction
1622 Bridge, tunnel, & elevated highway
6552 Subdividers and developers, nec
1611 Highway and street construction
1623 Water, sewer, and utility lines
NAICS Codes for Construction:
237 Heavy and Civil Engineering Construction
2362 Nonresidential Building Construction
236115 New Single-Family Housing Construction (except Operative Builders)
236116 New Multifamily Housing Construction (except Operative Builders)
236117 New Housing Operative Builders
237310 Highway, Street, and Bridge Construction
237130 Power and Communication Line and Related Structures Construction
237210 Land Subdivision

Manufacturing SIC Codes + NAICS Codes for Manufacturing

Manufacturing companies produce a wide variety of goods; major product groups include food and beverages, computers and electronics, chemicals, glass, machinery, metals, paper, plastic, rubber, textiles, transportation equipment, and wood. Altogether, there are about 650,000 companies with SIC and NAICS codes for restaurants in the US, according to Dun & Bradstreet. For more analysis on the manufacturing industry sector and for a complete list of SIC codes and NAICS codes, see D&B Hoovers industry insights for manufacturing.

NAICS Codes for Manufacturing:
321113 Sawmills
327213 Glass Container Manufacturing
332111 Iron and Steel Forging
332710 Machine Shops
333120 Construction Machinery Manufacturing
333415 Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing
334413 Semiconductor and Related Device Manufacturing
337121 Upholstered Household Furniture Manufacturing
339999 All Other Miscellaneous Manufacturing
SIC Codes for Manufacturing
2421 Sawmills & planing mills, general
2426 Hardwood dimension & flooring mills
3221 Glass containers
3312 Blast furnaces and steel mills
3315 Steel wire and related products
3443 Fabricated plate work (boiler shops)
3599 Industrial machinery, nec

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