Understanding the Six-Digit NAICS Coding Structure
The NAICS coding system uses a hierarchical structure where each digit narrows down the industry categorization. Every business establishment is assigned a specific classification based on its production process rather than its end product [1].
- Digits 1-2 (Sector): Represents the broad economic sector (e.g., Sector 54 represents Professional, Scientific, and Technical Services).
- Digit 3 (Subsector): Groups industries with similar economic activities (e.g., Subsector 541).
- Digit 4 (Industry Group): Aggregates related operations (e.g., Industry Group 5415).
- Digit 5 (Industry): Represents the standard industry classification (e.g., Industry 54151).
- Digit 6 (National Industry): Represents the most specific U.S. national classification, such as NAICS 541511 for Custom Computer Programming Services.
Worked Example: Hierarchy of NAICS 541511
To see how a specific entity is classified, let us analyze NAICS code 541511 (Custom Computer Programming Services):
| Tier | Code | Name |
|---|---|---|
| Sector | 54 | Professional, Scientific, and Technical Services |
| Subsector | 541 | Professional, Scientific, and Technical Services |
| Industry Group | 5415 | Computer Systems Design and Related Services |
| Industry | 54151 | Computer Systems Design and Related Services |
| National Industry | 541511 | Custom Computer Programming Services |
Federal agencies utilize these codes to analyze productivity, compile economic censuses, and determine eligibility for small business contracting assistance [2].