There are 9 US Post Offices in Delaware County serving a total of 54,796 residents equating to 6,088 residents per post office. It's estimated that approximately 87,461 packages are handled across the 9 county post offices annually. Delaware County is a county located in the U.S. state of Indiana. As of 2010, the population was 117,671. The county seat is Muncie. Delaware County is part of the Muncie, IN metropolitan statistical area."