Infrastructure Engineering, Inc.

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IEI Ranked #17 on Crain’s 2025 List of Largest Engineering Firms!

July 29, 2025

We are grateful for the recognition alongside so many talented peers shaping Chicago’s infrastructure on the 2025 Crain’s Chicago Business List of Largest Engineering Firms! This milestone reflects the dedication of our incredible team and the trust of our clients and partners.

Here’s to continued growth, great projects, and building a better future!

 

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