Mon-Fri 0830 AM - 0530 PM Sat 0900 AM - 0300 PM Sun Closed. USPS - Post Office - Marion at 202 W 3rd St in Indiana 46952-9998. Hill S Department Store In Downtown Marion Indiana On The Corner Of 5th And Washington Sts Marion Indiana Grant County Indiana Post Office Indianapolis Indiana circa 1885 Marion National Sanatorium headquarters Marion Indiana circa 1920 This project is made possible by a grant from the US. Post office marion indiana . Post Offices Mail Shipping Services. The Marion Post Office is located in the state of Indiana within Grant County. The USPS operates as an independent agency within the federal government supported entirely by. Monday 800am - 500pm. 3800 Highway 151 Marion IA 52302. Box services and passport services. There are 24 US Post Offices in Marion County serving a total of 632930 residents equating to 26372 residents per post office. The customer service postal facility offers mail and package delivery services PO. Located at Contra...