NAICS 561611: Investigation and Personal Background Check Services — Federal Contracts

What NAICS 561611 covers

The North American Industry Classification System (NAICS) is the standard the federal government uses to classify the industry of every contractor and every procurement. NAICS 561611 identifies businesses primarily engaged in investigation and personal background check services. When a contracting officer publishes a solicitation on SAM.gov, they tag it with the NAICS code that best matches the work — which is why getting your NAICS portfolio right inside SAM is the single most important step for showing up in agency searches.

Who buys NAICS 561611?

The federal agencies awarding the most contract value to vendors in this NAICS, based on 3 contractors tracked in the Mindy contractor database:

1. 1Defense Counterintelligence And Security Agency (DCSA)
2. 2Centers For Disease Control And Prevention
3. 3Defense Finance And Accounting Service (Dfas)
4. 4Defense Information Systems Agency (DISA)
5. 5Departmental Offices

Source: aggregated from the Mindy contractor database (prime contractor disclosures via SBA + agency directories).

Top contractors in NAICS 561611

The largest prime contractors associated with NAICS 561611, ranked by total reported federal contract value. These are your most likely incumbents — and your most likely teaming partners on recompetes:

1. 1
   CACI INC. - Federal

   $8.8B total reported value
2. 2
   Peraton Risk Decision INC.

   $117.7M total reported value
3. 3
   Peraton Solutions INC.

   $91.0M total reported value

Values reflect each contractor's aggregate reported federal contract value (across all of their NAICS codes, not just 561611). Use as a ranking signal, not as a per-NAICS award total.