NAICS Code 56161: Investigation, Guard, and Armored Car Services

NAICS industry

Definition

This industry comprises establishments primarily engaged in providing one or more of the following: (1) investigation, detective, and personal background check services; (2) guard and patrol services; and (3) picking up and delivering money, receipts, or other valuable items with personnel and equipment to protect such properties while in transit.

Government contracts for this service: PSC S206 Security Guard Services

Code facts

Codes under it
3
Contract awards
2,666 In the last 12 months
Contract obligations
$6,857,874,985 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.

Contract obligations by fiscal year

Fiscal year Obligated
FY2027 To date $233,336,199
FY2026 $8,116,079,920
FY2025 $6,857,874,985
FY2024 $6,399,966,761
FY2023 $6,344,708,983

Top contractors by obligations

Rank Contractor Obligated, FY2026–FY2027 Share
1 Amentum Services, Inc. $725,624,007
2 The GEO Group, Inc. $648,110,424
3 Metropolitan Security Services, Inc. $630,613,434
4 Corecivic, Inc. $358,902,886
5 Caci, Inc. - Federal $323,642,699
6 Universal Protection Service, LIMITED Partnership $317,558,400
7 Paragon Systems Inc. $289,026,772
8 Triple Canopy Inc. $273,012,227
9 Peraton Risk Decision Inc. $266,658,207
10 Akima Infrastructure Protection LLC $239,082,946

See the full FY2025 ranking of NAICS 56161 contractors, by parent company.

Top funding agencies by obligations

Rank Agency Obligated, FY2026–FY2027 Share
1 Department of Homeland Security $4,850,493,811
2 Department of State $805,268,313
3 Administrative Office of the U.S. Courts $688,280,882
4 Defense Counterintelligence and Security Agency Department of Defense $500,681,191
5 Department of the Army Department of Defense $308,443,077
6 Department of Justice $290,969,905
7 Department of Health and Human Services $157,428,780
8 National Aeronautics and Space Administration $91,286,223
9 Department of Veterans Affairs $90,663,139
10 Department of the Navy Department of Defense $70,987,238
Rank PSC code Obligated, FY2026–FY2027 Share
1 S206 Guard Services $6,197,725,007
2 R430 Support – Professional: Physical Security and Badging $777,773,423
3 R615 Support – Administrative: Background Investigation $669,832,233
4 R799 Other Management Support Services $221,330,345
5 R499 Other Professional Services $181,406,131
6 V999 Other Transportation Travel and Relocation Services $78,817,385
7 Y1AA Construction of Office Buildings $65,418,777
8 R408 Program Management/Support Services $25,218,854
9 M1FF Operation of Penal Facilities $17,588,346
10 R710 Support – Management: Financial $13,492,286

Contract obligations by state

Rank Place of performance Obligated, last 12 months Share
1 Texas $1,285,413,790
2 Virginia $966,121,680
3 California $766,150,982
4 Florida $640,048,349
5 Tennessee $617,271,872
6 District of Columbia $484,467,860
7 Maryland $280,461,533
8 New York $194,329,292
9 Alaska $152,357,321
10 Colorado $139,258,133
11 New Jersey $118,936,917
12 Georgia $117,308,135
13 Washington $111,765,911
14 Michigan $105,489,265
15 Missouri $93,426,218
16 Arizona $90,617,621
17 Utah $88,066,416
18 Pennsylvania $85,727,414
19 Massachusetts $53,417,694
20 Illinois $49,879,547
21 North Carolina $47,819,496
22 Alabama $44,895,257
23 Louisiana $43,819,628
24 Minnesota $41,694,508
25 New Mexico $41,036,248
26 Kansas $40,330,501
27 Ohio $39,403,507
28 Puerto Rico $37,540,669
29 Hawaii $25,427,315
30 Oregon $25,316,221
31 Mississippi $23,783,294
32 Kentucky $21,618,743
33 Montana $21,094,623
34 West Virginia $18,448,391
35 Oklahoma $17,273,002
36 South Dakota $16,385,046
37 South Carolina $14,667,233
38 Indiana $14,402,184
39 Nevada $13,799,371
40 Connecticut $8,780,925
41 Arkansas $8,323,290
42 Wisconsin $8,214,783
43 Idaho $8,070,862
44 New Hampshire $5,527,623
45 Nebraska $4,960,002
46 Rhode Island $4,634,089
47 Iowa $3,796,004
48 Maine $3,365,392
49 Vermont $2,203,898
50 Guam $1,817,251
51 North Dakota $1,621,406
52 Delaware $1,519,231
53 Wyoming $582,767
54 U.S. Virgin Islands $343,992
55 Northern Mariana Islands $105,228
Show all 55

Shares are of everything obligated under NAICS 56161 in the last 12 months before deobligations, including work performed abroad or with no place of performance on record.

Contract opportunities

Notice Posted Due
J&A No. : FY26-0262: Contract 70RFP121DE2000001 Limited / Sole Source Justification · Office of Procurement Operations —
FRCSE Information Monitoring and Protection Services - Modular Project Special Notice · Naval Air Systems Command (Navy)
EUR/ATHENS - Cash Transportation Services Pre-Solicitation · US Embassy Athens (DOS)
Force protection of robert E. Kamosa transmitting station facilities, tinian Pre-Solicitation · Pacific Air Forces (USAF)
Justification for Other than Full and Open Competition – Torrance and Cibola Detention Facilities Limited / Sole Source Justification · Immigration and Customs Enforcement —
PANDHA-26-P-0000 046239 Security Support Services Special Notice
Transition Security Guard Services — CDC Facilities, Metro Atlanta, Georgia and Fort Collins, Colorado Pre-Solicitation · Office of Financial Resources (CDC)
U.S. Mission Burundi Local Guard Program Pre-Solicitation · Office of Acquisition Management
Solicitation - U.S. Mission Accra, Ghana Award Notice · Office of Acquisition Management —
Armored Car Services Solicitation · Bureau of Engraving and Printing
S206--Task Order 3, Unarmed Security Guard Service-675C70077 Award Notice · Veterans Integrated Service Network 8 (VHA) —
CTX armored car services Pre-Solicitation · Veterans Integrated Service Network 17 (VHA)
Detention and Transportation Services at the Northwest ICE Processing Center in Tacoma, WA Award Notice · Immigration and Customs Enforcement —
Information Monitoring and Protection Services Solicitation · Naval Air Systems Command (Navy)
Guard Force Performance Management (GFPM) Surveillance Services Pre-Solicitation · National Institutes of Health
Sioux Falls Regional Airport (FSD) Security Screening Services Extension Limited / Sole Source Justification · Transportation Security Administration —
Frederick Douglass Greater Rochester International Airport (ROC) Security Screening Services Extension Limited / Sole Source Justification · Transportation Security Administration —
Fingerprint Services Special Notice · Naval Sea Systems Command (Navy)
Multiple Award Schedule Award Notice · Federal Acquisition Service · 47QSMD20R0001
Contract Security Officer Services-Western Service Area Award Notice · Headquarters (FAA) —
USPS EEO investigator services - october 2026 solicitation Solicitation · United States Postal Service
AMENDMENT 0003 _Sol_70FBR427R00000001 Level II Armed Guard Security Services Solicitation · FEMA Region 4
Request for Information - DCSA Personnel Vetting (PV) Fieldwork Services Requirement Pre-Solicitation · Defense Counterintelligence and Security Agency
Multiple Award Schedule Award Notice · Federal Acquisition Service · 47QSMD20R0001
S206--Unarmed Security Guards at the SLVHCS POP: 12/20/2026 - 12/19/2027 4 Option Years POC: Christopher Rossi Pre-Solicitation · Veterans Integrated Service Network 16 (VHA)
S206--691 | North Campus Security Staffing | PoP: 05/14/2027 - 12/31/2028 Pre-Solicitation · Veterans Integrated Service Network 22 (VHA)
Notice of Intent to Single Source- Construction Surveillance Technicians Special Notice · Pacific Air Forces (USAF)
Security Services at Davis and Parker Dams Pre-Solicitation
Local Guard Forces US Mission Dhaka, Bangladesh Award Notice · Office of Acquisition Management —
Local Guard Forces U. S. Mission Santiago, Chile Award Notice · Office of Acquisition Management —
Security Guard Services Wilkes-Barre VAMC CBOCs Award Notice · Veterans Integrated Service Network 4 (VHA) —
Local Guard Services U. S. Mission Guatemala City, Guatemala Pre-Solicitation · Office of Acquisition Management
Cleared American Guards(CAGs)and Construction Surveillance Technicians (CSTs) Pre-Solicitation · Office of Acquisition Management
Forensic Polygraph services Solicitation · Administrative Office of the U.S. Courts
R430--Unarmed Security Guards, 11/01/2026 - 10/31/2027, 508C75732 Award Notice · Veterans Integrated Service Network 7 (VHA) —
Justification For Exception to Fair Opportunity - Global Protective Services (GPS) Erbil, Iraq Limited / Sole Source Justification · ACC Rock Island —
Batavia Detention Infrastructure Limited / Sole Source Justification · Immigration and Customs Enforcement —
Armed Protective Security Services - IRS Campus in Austin, TX Pre-Solicitation · Office of Procurement Operations
Regional security operation services for naval district washington Limited / Sole Source Justification · Naval Facilities Engineering Command (Navy) —
Level II-Armed Protective Security Officers Indiana Solicitation · Federal Emergency Management Agency
Parma cboc security services Award Notice · Veterans Integrated Service Network 10 (VHA) —
S206--Unarmed Security Guard Contract Award Notice · Veterans Integrated Service Network 16 (VHA) —
Armed Protective Security Officer Services, Los Angeles Area Solicitation · Office of Procurement Operations
Amendment 0003 unarmed security services jesse brwon VAMC and cbocs Special Notice · Veterans Integrated Service Network 12 (VHA)
R430--BASE - Security Guards Services for the Milwaukee VAMC & CBOCs 695C70014 - UCD 09-30-2031 Award Notice · Veterans Integrated Service Network 12 (VHA) —
U. S. Mission Italy Award Notice · Office of Acquisition Management —
Ground Transportation & Facility Guard Services Arizona and California Special Notice · Customs and Border Protection
Amendment 0002 36C25227Q0011_1 unarmed security services jesse brown VAMC and cbocs Special Notice · Veterans Integrated Service Network 12 (VHA)
Show 38 more

Latest 48 of 8,226 listed here. See the rest on GovTribe.

Codes under 56161

NAICS code Size standard
561611 Investigation and Personal Background Check Services $25 million in average annual receipts
561612 Security Guards and Patrol Services $29 million in average annual receipts
561613 Armored Car Services $43 million in average annual receipts

Quick answers

What is NAICS 56161?

NAICS 56161 is Investigation, Guard, and Armored Car Services, a NAICS industry in NAICS 56, Administrative and Support and Waste Management and Remediation Services.

What codes are under NAICS 56161?

NAICS 56161 has 3 codes under it with their own GovTribe pages: 561611 Investigation and Personal Background Check Services, 561612 Security Guards and Patrol Services and 561613 Armored Car Services.

How much do federal agencies spend under NAICS 56161?

Federal contracts under NAICS 56161 obligated $6,857,874,985 in fiscal year 2025 and $27,951,966,848 in fiscal years 2023 through 2027.

Who are the largest contractors under NAICS 56161?

The contractors with the most obligated under NAICS 56161 in fiscal years 2026 and 2027 are Amentum Services, Inc. ($725,624,007); The GEO Group, Inc. ($648,110,424); and Metropolitan Security Services, Inc. ($630,613,434).

Which agencies buy the most under NAICS 56161?

The agencies that obligated the most under NAICS 56161 in fiscal years 2026 and 2027 are Department of Homeland Security ($4,850,493,811), Department of State ($805,268,313) and Administrative Office of the U.S. Courts ($688,280,882).

Which PSC codes are used with NAICS 56161?

The PSC codes with the most obligated under NAICS 56161 in fiscal years 2026 and 2027 are S206 Guard Services, R430 Support – Professional: Physical Security and Badging and R615 Support – Administrative: Background Investigation.

Where is the work under NAICS 56161 performed?

By place of performance, the states with the most contract obligations under NAICS 56161 over the last 12 months are Texas ($1,285,413,790), Virginia ($966,121,680) and California ($766,150,982).

What is the latest contract opportunity under NAICS 56161?

The latest contract opportunity under NAICS 56161 is J&A No. : FY26-0262: Contract 70RFP121DE2000001, limited / sole source justification from Office of Procurement Operations, posted November 10, 2026.

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