Sector Definition
The highest classification tier in the NAICS hierarchy, represented by a two-digit code or range (e.g., Sector 54 representing Professional Services).
Related Guides & Tools
- SBA Size Standards Guide — Legal rules of small business classification.
- Federal Contracting Identifiers Guide — Overview of CAGE, DUNS, and Unique Entity IDs.
- SIC ↔ NAICS Concordance Crosswalk — Search and map old SIC codes to modern formats.