There are 12 US Post Offices in Warren County serving a total of 44,993 residents equating to 3,749 residents per post office. It's estimated that approximately 71,814 packages are handled across the 12 county post offices annually. Warren County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 46,225. The county seat is Indianola. Warren County is included in the Des Moines\u2013West Des Moines, IA Metropolitan Statistical Area."