# NAICS 561621: Security Systems Services (except Locksmiths)

The SBA size standard for NAICS 561621 is $25,000,000 in average annual receipts (13 CFR 121.201).

| Field | Value |
| --- | --- |
| Code | 561621 |
| Title | Security Systems Services (except Locksmiths) |
| Level | 6 |
| Parent | 56162 |
| Size standard | $25,000,000 in average annual receipts |
| Footnote | - |

## Description

This U.S. industry comprises establishments primarily engaged in (1) selling security alarm systems, such as burglar and fire alarms, along with installation, repair, or monitoring services or (2) remote monitoring of electronic security alarm systems.

## Sources

- Census NAICS: https://www.census.gov/naics/
- SBA size standards: https://www.sba.gov/document/support-table-size-standards

## API and MCP

- REST: GET https://samgovapi.io/api/v1/naics/561621/size-standard?revenue_usd=...
- MCP tools: naics_lookup, size_standard_check

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