State/County Government

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Post Office Information

Westmont Post Office (Serves Darien and Westmont)

5705 Cass Avenue
Westmont, Illinois 60559
Telephone: 630-968-0855
Hours: Monday and Friday - 8:30am - 5:00pm
Tuesday and Thursday - 8:30am - 5:30pm
Wednesday and Saturday - 8:30am - 1:00pm

Willowbrook, Burr Ridge, Darien (WBD) Carrier Annex
7140 S. Monroe St
Willowbrook
630-323-3950
Hours: Monday through Friday 10:00am to 4:00pm and Saturday 9:00am to Noon.