Youngtown Post Office, 11129 W. Arizona Ave., 85363-9998 — Closed until further notice due to flooding. During this closure, PO Box mail and retail services will be available at the Sun City Post Office, 9802 W. Bell Rd., 85351-9998. Hours are Monday through Friday, 9 a.m. to 5 p.m., and Saturday, 9 a.m. to 1 p.m. Customers are reminded to bring proper photo identification to pick up mail and packages.