561611 — Investigation and Personal Background Check Services
Description
This U.S. industry comprises establishments primarily engaged in providing investigation, detective, and personal background check services.
Illustrative Examples
- Fingerprint services
- Private detective services
- Polygraph services
- Private investigative services (except credit)
Exclusions & Cross-References
- Establishments primarily engaged in providing credit checks are classified in Industry 561450, Credit Bureaus.
Overview Facts
| NAICS Code | 561611 |
|---|---|
| Industry Title | Investigation and Personal Background Check Services |
| SBA Size Standard | $25,000,000 |
| IRS PBA Code | 561600 (rolled-up match) |
| Sectors Hierarchy | Sector 56 → 561 → 5616 |
| Source / Verified | US Census 2022 NAICS Manual / 2026-06-28 |
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 7381 - Detective, Guard, and Armored Car Services (via SIC1987:7381→NAICS1997:561611→2002:561611→2007:561611→2012:561611→2017:561611→2022:561611)
Related Resources & Compliance Guides
Further regulatory reference links for NAICS code 561611:
- Sector 56 Directory Hub — List of related industries in the Administrative and Support and Waste Management and Remediation Services sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.
Related Industries in 5616
Frequently Asked Questions (FAQ)
Is 561611 a valid 2022 NAICS code?
NAICS 561611 is 'Investigation and Personal Background Check Services', a 2022 U.S. national industry under Sector 56 (Administrative and Support and Waste Management and Remediation Services); the SBA small-business size standard is $25,000,000.
What is the SBA size standard for NAICS 561611?
The SBA small business size standard for NAICS 561611 is $25,000,000 (based on receipts).
What is the legacy SIC code mapping for 561611?
NAICS code 561611 maps to the legacy 1987 SIC codes: 7381 - Detective, Guard, and Armored Car Services.