Post Office - Hy Vee #1610 2827 Hamilton Blvd Sioux City, IA 51104 Phone : (712) 277-8120 Business Category Post Offices Toll-Free           (800) ASK-USPS Starbucks 313 Cook St Sioux City, IA 51103 Phone : (712) 277-8120 Starbucks Business Category Restaurants Coffee Shops Services           Retail