What are SIC Codes?
SIC Directory / Lookup
SIC to NAICS Conversion
What are NAICS Codes?
NAICS Directory / Lookup
NAICS to SIC Conversion
SIC/NAICS Business Lists - Databases
SIC/NAICS Code Appending
Canada Business Lists
Classification Systems Overview
Product Codes US & International
Additional Industry Codes
Specialized Business Codes
Occupational & Educational Codes
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The NAICS Directory contains a database of all the North American Industry Classification System codes. Use the search box or simply click on any category below.
Construction of Buildings
Heavy and Civil Engineering Construction
Specialty Trade Contractors