There are 16 US Post Offices in Story County serving a total of 113,845 residents equating to 7,115 residents per post office. It's estimated that approximately 181,709 packages are handled across the 16 county post offices annually. Story County is a county in the U.S. state of Iowa. As of the 2010 census, the population was 89,542. The county seat is Nevada. Story county comprises the Ames, IA Metropolitan Statistical Area, which is included in the Des Moines-Ames-West Des Moines, IA Combined Statistical Area. The county is home to Iowa State University in Ames."