There are 10 US Post Offices in Hendricks County serving a total of 99,844 residents equating to 9,984 residents per post office. It's estimated that approximately 159,362 packages are handled across the 10 county post offices annually. Hendricks County is a county located in the U.S. state of Indiana. As of the 2010 Census, the population was 145,448. The county seat is Danville. Hendricks County is the third largest county within the Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area. Hendricks County is currently the second fastest-growing county in Indiana and 85th in the nation."