NAICS Code 561611: Investigation and Personal Background Check Services
National industry
SBA small business size standard: $25 million in average annual receipts
Definition
This U.S. industry comprises establishments primarily engaged in providing investigation, detective, and personal background check services.
Government contracts for this service: PSC R615 Support – Administrative: Background Investigation
Code facts
- Part of
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56
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561
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5616
- 56161
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5616
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561
-
56
- Contract awards
- 401 In the last 12 months
- Contract obligations
- $857,527,048 In FY2025
NAICS codes and definitions come from the U.S. Census Bureau, size standards from the SBA and contract spending from SAM.gov/FPDS.
Business activities under NAICS 561611
- Detective agencies
- Fingerprint services
- Investigation services (except credit), private
- Investigators, private
- Lie detection services
- Missing person tracing services
- Polygraph services
- Private detective services
- Private investigation services (except credit)
- Skip tracing services
Looking for another activity? Search the NAICS code lookup or browse business activities from A to Z.
Contract obligations by fiscal year
| Fiscal year | Obligated |
|---|---|
| FY2027 To date | $6,251,598 |
| FY2026 | $1,022,766,099 |
| FY2025 | $857,527,048 |
| FY2024 | $730,220,737 |
| FY2023 | $713,990,310 |
Top contractors by obligations
| Rank | Contractor | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Caci, Inc. - Federal | $323,642,699 | |
| 2 | Peraton Risk Decision Inc. | $266,658,207 | |
| 3 | Asrc Federal Administrative Services, LLC | $42,319,746 | |
| 4 | Omniplex World Services Corporation | $31,174,114 | |
| 5 | Professional Risk Management, Inc. | $31,076,360 | |
| 6 | Capgemini Government Solutions LLC | $19,267,131 | |
| 7 | Protection Strategies Inc. | $16,703,193 | |
| 8 | Iworks Corp | $16,473,958 | |
| 9 | Five Stones Intelligence, Inc. | $15,567,574 | |
| 10 | Caduceus Inc. | $13,997,500 |
See the full FY2025 ranking of NAICS 561611 contractors, by parent company.
Top funding agencies by obligations
| Rank | Agency | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Defense Counterintelligence and Security Agency | $500,681,191 | |
| 2 | Department of Homeland Security | $372,247,242 | |
| 3 | Department of Justice | $55,902,140 | |
| 4 | Department of Health and Human Services | $30,802,635 | |
| 5 | Department of Agriculture | $13,279,955 | |
| 6 | Department of Veterans Affairs | $11,572,901 | |
| 7 | Department of State | $7,189,206 | |
| 8 | Department of the Navy | $6,943,063 | |
| 9 | Department of the Treasury | $6,907,655 | |
| 10 | Social Security Administration | $6,152,003 |
Top PSC codes by obligations
| Rank | PSC code | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | R615 Support – Administrative: Background Investigation | $657,684,298 | |
| 2 | R799 Other Management Support Services | $219,542,439 | |
| 3 | R499 Other Professional Services | $68,040,513 | |
| 4 | R430 Support – Professional: Physical Security and Badging | $14,565,168 | |
| 5 | R710 Support – Management: Financial | $13,493,546 | |
| 6 | R418 Legal Services | $10,798,723 | |
| 7 | R431 Support – Professional: Human Resources | $10,353,938 | |
| 8 |
H399 Inspection and Laboratory Services (except medical/ |
$8,812,304 | |
| 9 | R423 Intelligence Services | $8,383,326 | |
| 10 | R425 Engineering and Technical Services | $5,703,448 |
Contract obligations by state
| Rank | Place of performance | Obligated, last 12 months | Share |
|---|---|---|---|
| 1 | Virginia | $605,735,622 | |
| 2 | District of Columbia | $107,776,746 | |
| 3 | Maryland | $49,738,867 | |
| 4 | Colorado | $46,065,888 | |
| 5 | Pennsylvania | $45,123,201 | |
| 6 | Georgia | $27,168,141 | |
| 7 | Texas | $25,480,473 | |
| 8 | Florida | $19,328,147 | |
| 9 | Tennessee | $10,423,946 | |
| 10 | Louisiana | $9,795,055 | |
| 11 | Illinois | $8,226,201 | |
| 12 | Alabama | $6,208,034 | |
| 13 | Alaska | $5,784,479 | |
| 14 | California | $5,199,364 | |
| 15 | Missouri | $4,062,532 | |
| 16 | Ohio | $3,220,572 | |
| 17 | Arizona | $1,064,835 | |
| 18 | Indiana | $424,289 | |
| 19 | South Carolina | $368,976 | |
| 20 | Iowa | $337,216 | |
| 21 | Puerto Rico | $337,098 | |
| 22 | South Dakota | $259,425 | |
| 23 | North Dakota | $234,702 | |
| 24 | Utah | $163,800 | |
| 25 | Washington | $79,088 | |
| 26 | North Carolina | $61,757 | |
| 27 | Michigan | $57,699 | |
| 28 | Connecticut | $51,295 | |
| 29 | Massachusetts | $47,141 | |
| 30 | Wisconsin | $25,837 | |
| 31 | Idaho | $22,875 | |
| 32 | Oregon | $21,172 | |
| 33 | New York | $18,448 | |
| 34 | Hawaii | $17,842 | |
| 35 | Nevada | $17,564 | |
| 36 | Kentucky | $16,911 | |
| 37 | New Hampshire | $9,627 | |
| 38 | Delaware | $7,951 | |
| 39 | Minnesota | $6,252 | |
| 40 | Montana | $5,243 | |
| 41 | Arkansas | $5,069 | |
| 42 | Mississippi | $2,650 | |
| 43 | Kansas | $654 |
Show all 43
Shares are of everything obligated under NAICS 561611 in the last 12 months before deobligations, including work performed abroad or with no place of performance on record.
Contract opportunities
Show 40 more
Latest 50 of 1,110 listed here. See the rest on GovTribe.
Size standard history
Federal Register rules that named this code
From the NAICS codes each rule's amendments to 13 CFR 121.201 name. Rules that print their size standard tables as images aren't listed.
Quick answers
What is NAICS 561611?
NAICS 561611 is Investigation and Personal Background Check Services, a national industry in NAICS 56, Administrative and Support and Waste Management and Remediation Services.
What is the NAICS code for detective agencies?
The NAICS code for detective agencies is 561611, Investigation and Personal Background Check Services.
What is the NAICS code for polygraph services?
The NAICS code for polygraph services is 561611, Investigation and Personal Background Check Services.
What is the NAICS code for fingerprint services?
The NAICS code for fingerprint services is 561611, Investigation and Personal Background Check Services.
When did the size standard for NAICS 561611 last change?
The most recent Federal Register rule on record that names NAICS 561611 in the SBA's size standards is "Small Business Size Standards: Adjustment of Monetary-Based Size Standards, Disadvantage Thresholds, and 8(a) Eligibility Thresholds for Inflation" (87 FR 69118), published Nov 17, 2022 and effective Dec 19, 2022.
How much do federal agencies spend under NAICS 561611?
Federal contracts under NAICS 561611 obligated $857,527,048 in fiscal year 2025 and $3,330,755,790 in fiscal years 2023 through 2027.
Who are the largest contractors under NAICS 561611?
The contractors with the most obligated under NAICS 561611 in fiscal years 2026 and 2027 are Caci, Inc. - Federal ($323,642,699); Peraton Risk Decision Inc. ($266,658,207); and Asrc Federal Administrative Services, LLC ($42,319,746).
Which agencies buy the most under NAICS 561611?
The agencies that obligated the most under NAICS 561611 in fiscal years 2026 and 2027 are Defense Counterintelligence and Security Agency ($500,681,191), Department of Homeland Security ($372,247,242) and Department of Justice ($55,902,140).
Which PSC codes are used with NAICS 561611?
The PSC codes with the most obligated under NAICS 561611 in fiscal years 2026 and 2027 are R615 Support – Administrative: Background Investigation, R799 Other Management Support Services and R499 Other Professional Services.
Where is the work under NAICS 561611 performed?
By place of performance, the states with the most contract obligations under NAICS 561611 over the last 12 months are Virginia ($605,735,622), the District of Columbia ($107,776,746) and Maryland ($49,738,867).
What is the latest contract opportunity under NAICS 561611?
The latest contract opportunity under NAICS 561611 is Fingerprint Services, special notice from Naval Sea Systems Command (Navy), posted October 26, 2026.
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