NAICS 2022 nationalIndustry * USA Verified: Census NAICS 2022 · 2026-01-01
561611
NAICS 561611 — Investigation and Personal Background Check Services
Investigation and Personal Background Check Services
NAICS 561611 is the national industry code for investigation and personal background check services establishments in the United States. The Small Business Administration sets a size standard of $25.0 for this classification. It forms part of the hierarchical North American Industry Classification System maintained by the Census Bureau.
SBA: $25.0
View full SBA standard
Related industries in 56161 (Investigation, Guard, and Armored Car Services)
View parent 56161Exclusions & Cross-References
Activities classified under other official NAICS codes:
- providing credit reporting services (See 561450 Credit bureaus)
Official Illustrative Examples
Primary activities officially recognized by Census Bureau / Statistics Canada:
detective agencies fingerprint services lie detection service missing person tracing service polygraph service skip tracers services
Complete Index of Activities (11 recognized activities) ▼
criminal record checks and searches
detective agencies
fingerprint services
investigation services (except credit)
lie detection service
missing person tracing service
polygraph service
private detectives services
private investigation services
reference check services
skip tracers services
Official data
| Feature | Description |
|---|---|
| Official name | North American Industry Classification System (NAICS) 2022 |
| Issuing authority | U.S. Census Bureau with OMB, Statistics Canada, and INEGI |
| Tax authority | Internal Revenue Service (IRS) |
| Purpose | Statistical business classification and federal contracting (SAM.gov, SBA standards) |
| Used in | SAM.gov registration, SBA size determinations, IRS tax classification, SEC EDGAR (via SIC crosswalk) |
| Active since | 2022 (current edition) |
| Hierarchy level | Sector (2-digit) |
| Source | https://www.census.gov/naics/ |
NAICS hierarchy path
Trace the classification from the broadest sector down to this national industry code.
Cross-references & crosswalks
SBA size standard description
Investigation and Personal Background Check Services
Changes to receipts-based standard: [object Object]