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As of right now, no, there is not an AMEX Centurion Lounge at Chicago ORD.
A full list of AMEX lounge locations is below.
https://www.thecenturionlounge.com/
You do have access to a Priority Pass lounge with your AMEX Platinum card at O’Hare in Terminal 5.
thecenturionlounge.com
Welcome to The Centurion® Network
The Centurion Lounge, by American Express. An exclusive, technologically enhanced experience. Explore, relax and discover.