North American Industry Classification System, or NAICS, codes are standardized categories used by government agencies, researchers, and economic development organizations to classify business activity and measure employment, revenue, and industry growth. Including these codes helps connect the Literary and Publishing industry to established economic data and provides a consistent way to understand how literary creation, publishing, distribution, and related business activity appear within the broader economy.

The disciplines listed alongside each NAICS code show the range of literary practices, professions, and activities that make up the industry. This distinction is important because a single economic classification may include several literary and publishing disciplines, while some disciplines may span more than one code. Presenting both creates a clearer picture of how the industry is structured, how literary and publishing work is counted, and where individual practitioners and organizations fit within the larger Creative Sector.