# NAICS 561611: Investigation and Personal Background Check Services

Breadcrumb: [NAICS codes](https://bidrover.com/naics) › [561611 Investigation and Personal Background Check Services](https://bidrover.com/naics/561611)

This U.S. industry comprises establishments primarily engaged in providing investigation, detective, and personal background check services.

- NAICS code: 561611
- Title: Investigation and Personal Background Check Services
- Sector: 56 Administrative and Support and Waste Management and Remediation Services
- Subsector: 561 Administrative and Support Services
- Industry group: 5616 Investigation and Security Services
- NAICS industry: 56161 Investigation, Guard, and Armored Car Services
- SBA size standard: $25 million average annual receipts
- Open bids on BidRover: 0

## Open bids (0)

No open bids cite this code right now.

## Frequently asked questions

### What is NAICS code 561611?

NAICS 561611 is "Investigation and Personal Background Check Services" in the 2022 North American Industry Classification System, in sector 56 (Administrative and Support and Waste Management and Remediation Services). This U.S. industry comprises establishments primarily engaged in providing investigation, detective, and personal background check services.

### What is the SBA size standard for NAICS 561611?

A business is small under NAICS 561611 at or below $25 million average annual receipts, including affiliates (13 CFR 121.201). Confirm the standard named in each solicitation.

### How many government bids are open under NAICS 561611?

No open bid in BidRover cites NAICS 561611 right now. Many state and local notices do not list a NAICS code, so a keyword alert for this work catches more of them.

### How do I get alerts for NAICS 561611 bids?

Save an alert on this page. A free account gets new matching bids by weekly email; the Team plan ($19/mo) sends daily alerts with match scores, the buyer, source link and documents.

## Related NAICS codes

- [561450 Credit Bureaus](https://bidrover.com/naics/561450)
- [561612 Security Guards and Patrol Services](https://bidrover.com/naics/561612)
- [561613 Armored Car Services](https://bidrover.com/naics/561613)
- [561621 Security Systems Services (except Locksmiths)](https://bidrover.com/naics/561621)
- [561622 Locksmiths](https://bidrover.com/naics/561622)

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Code titles and definitions: U.S. Census Bureau, North American Industry Classification System (NAICS), 2022 (https://www.census.gov/naics/). Size standards: U.S. Small Business Administration, Small Business Size Standards, 13 CFR 121.201, eCFR text current as of 2026-10-21 (https://www.ecfr.gov/current/title-13/section-121.201).

BidRover lists bids from official public sources. It is not an issuing authority; confirm the NAICS code and size standard named in each solicitation.