NAICS 2022 nationalIndustry USA Verified: Census NAICS 2022 · 2026-01-01
561621
NAICS 561621 — Security Systems Services (except Locksmiths)
Security Systems Services (except Locksmiths)
NAICS 561621 is the national industry code for security systems services (except locksmiths) 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 56162 (Security Systems Services)
View parent 56162Exclusions & Cross-References
Activities classified under other official NAICS codes:
- locksmith services (See 561622 Locksmiths (US))
- retailing motor vehicle security systems, with or without installation or repair services (See 441330 Automotive parts and accessories retailers (US))
- retailing security systems for buildings, without installation, maintenance or monitoring services (See 459999 All other miscellaneous retailers (except beer and wine-making supplies retailers) (CAN))
- wholesaling security systems for buildings, without installation, maintenance or monitoring services (See 416110 Electrical wiring and construction supplies merchant wholesalers (CAN))
Complete Index of Activities (3 recognized activities) ▼
alarm system (e.g., burglar, fire, security), sale combined with installation, maintenance or monitoring
alarm system monitoring
medical alarm, monitoring and service
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
NAICS 2017 equivalent 561621
Security Systems Services (except Locksmiths)
View full 2022 → 2017 crosswalkSBA size standard description
Security Systems Services (except Locksmiths)
Changes to receipts-based standard: [object Object]