Department of Transportation NAICS 561621 and PSC R425 contractors

Security Systems Services (except Locksmiths). SUPPORT- PROFESSIONAL: ENGINEERING/TECHNICAL. Use this deeper buyer cross-code page to see which visible contractors sit in the overlap between these two lanes under Department of Transportation.

Department of Transportation · NAICS 561621 · PSC R425

Last updated: April 8, 2026

Visible recipients

Mapped obligations

$1,625,493,048

State overlap

Top recipients

Visible recipients in the Department of Transportation overlap of NAICS 561621 and PSC R425

Serco INC

Herndon, VA

Serco INC is a federal category business profile based in Herndon, VA. The current public data layer shows $1,004,172,019 in visible federal obligations across 1,016 awards or transactions. Department of Defense appears as the strongest visible awarding agency. Top industry concentration is in NAICS 541330 (Engineering Services). The profile also shows meaningful product and service activity in PSC R499.

$1,625,493,048