The North American Industry Classification System (NAICS) is a 6-digit code, developed jointly by the U.S., Canada, and Mexico. It replaces the Standard Industrial Classification ( (SIC) in the US.
The first two digits designate a major Economic Sector (formerly Division) such as Agriculture or Manufacturing.
The third digit designates an Economic Sub-sector (formerly Major Group) such as Crop Production or Apparel Manufacturing.
The fourth digit designates an Industry Group, such as Grain and Oil Seed Farming or Fiber, Yarn and Thread Mills.
The fifth digit designates the NAICS Industry such as Wheat Farming or Broadwoven Fabric Mills.