Department of State NAICS 541990 contractors

All Other Professional, Scientific, and Technical Services. Contractors in this NAICS lane under Department of State.

Agency: Department of State

Last updated: April 17, 2026

Visible recipients

Mapped obligations

$2,671,844,380

Visible recipients tied to Department of State and NAICS 541990

Mantech Systems Engineering Corporation

Fairfax, VA

Fairfax, VA | 5 awards | Top agency Department of Defense | NAICS 541330

$3,966,572

Amentum Government Services, Inc.

Chantilly, VA

Chantilly, VA | 5 awards | Top agency Department of Defense | NAICS 811118

$237,693,939

Caci Intelligence Solutions, LLC

Herndon, VA

Herndon, VA | 5 awards | Top agency Department of Defense | NAICS 541990

$276,730,312

Aar Government Services, Inc.

Wood Dale, IL

Wood Dale, IL | 429 awards | Top agency Department of Defense | NAICS 488190

$28,645,341

Aecom Energy & Construction, Inc.

Greenwood Village, CO

Greenwood Village, CO | 5 awards | Top agency Department of Defense | NAICS 237990

$7,661,197

Sos International LLC

Reston, VA

Reston, VA | 138 awards | Top agency Department of Defense | NAICS 561210

$123,598,085

Guidehouse LLP

Mc Lean, VA

Mc Lean, VA | 134 awards | Top agency Department of State | NAICS 541611

$441,292,503

Siemens Government Technologies INC

Arlington, VA

Arlington, VA | 227 awards | Top agency Department of Defense | NAICS 541512

$535,381,114

Everfox LLC

Herndon, VA

Herndon, VA | 89 awards | Top agency Department of Defense | NAICS 611420

$43,838,533

Counterpart International, Inc.

Washington, DC

Washington, DC | 5 awards | Top agency Agency for International Development | NAICS 541990

$9,556,747

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