United States Post Office

Address: 1101 Main Street
Irwin, PA 15642
Phone: 800-ASK-USPS
Fax: 724-863-9514
Business Hours: Monday through Friday: 8:30 a.m. to 4:30 p.m.
Saturday: 8:30 a.m. to 2 p.m.

Website Address: www.usps.com

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