Department of Transportation NAICS 541990 contractors in Illinois

All Other Professional, Scientific, and Technical Services. Use this deeper state-buyer-industry page to see which visible contractors sit closest to this exact overlap in the public AwardRegistry layer.

Illinois + Department of Transportation

Last updated: April 7, 2026

Visible recipients

Mapped obligations

$622,102

Visible recipients tied to Department of Transportation, Illinois, and NAICS 541990

Walsh Federal LLC

Chicago, IL

Walsh Federal LLC is a federal category business profile based in Chicago, IL. The current public data layer shows $406,413,501 in visible federal obligations across 169 awards or transactions. Department of Defense appears as the strongest visible awarding agency. Top industry concentration is in NAICS 236220 (Commercial and Institutional Building Construction). The profile also shows meaningful product and service activity in PSC Y1BZ.

$622,102