What Are SIC & NAICS Codes?
SIC: Standard Industrial Classification (SIC) codes are 4, 6, or 8-digit numerical codes assigned to business establishments to identify the primary business of the establishment.
NAICS: The North American Industry Classification System (NAICS) are 6-digit numerical codes assigned to businesses to classify them. NAICS codes provide a greater level of detail about a firm's activity than SIC codes. NAICS includes 1,170 industries and SIC includes 1,004 industries. There are 358 new industries recognized in NAICS, 250 of which are services producing industries.