Behavioral Risk Factor Surveillance System: Coding Schemes Used

Industry and Occupation Coding Schemes Used

There are several different industry and occupation coding schemes. The flu vaccine data summary for industry includes both the U.S. Census industry codes and the corresponding North American Industry Classification System (NAICS) U.S. Census Bureauexternal icon codes. The data summary for occupation includes both the Census occupation codes and the corresponding Standard Occupational Classification System (SOC)external icon codes.

Researchers cross-walked the Census industry codes to NAICS codes, which are the federal standard for classifying industry in the U.S.

NAICS is a 2- through 6-digit hierarchical classification system, offering five levels of detail. Each digit in the code is part of a series of progressively narrower categories, and more digits in the code signifies greater classification detail. The first two digits designate the twenty economic sectors, the third digit designates the subsector, the fourth digit designates the industry group, the fifth digit designates the NAICS industry, and the sixth digit designates the national industry.

Researchers cross-walked the Census occupation codes to SOC codes, which are the federal standard for classifying occupation in the U.S.

SOC codes are hierarchical, 6-digit codes designating major group, minor group, broad occupation, and detailed occupation. The first two digits are the major group, the third digit is the minor group, the fourth and fifth digits are the broad occupation, and the sixth digit is the detailed occupation. The hyphen between the second and third digits is for clarity only. Zeroes are used as placeholders: major group codes end with 0000, minor groups end with 000, and broad occupations end with 0. All residuals (“other,” “miscellaneous,” or “all other”), whether at the detailed or broad occupation or minor group level, contain a 9 at the level of the residual.

Grouping Industry and Occupation

It can be useful to assess industry and occupation in groups, which can be accomplished because both NAICS and SOC codes are hierarchical. Census codes are not themselves hierarchical, but they follow the hierarchical pattern of NAICS and SOC codes.

Estimates are presented in the Estimates are presented by industry pdf icon[PDF – 181 KB] and occupation pdf icon[PDF – 229 KB] at three levels of detail (or groups) at three levels of detail (or groups).

  • The blue rows are the highest or broadest grouping of industry or occupation.
  • The gray rows are intermediate level groupings of industries or occupations and are subsumed within the blue row above them.
  • The white rows are individual Census codes; these are the most detailed (ungrouped) level of industry or occupation.
Page last reviewed: May 14, 2021