There are 7 US Post Offices in White County serving a total of 13,390 residents equating to 1,913 residents per post office. It's estimated that approximately 21,372 packages are handled across the 7 county post offices annually. White County is a county located in the U.S. state of Illinois. According to the 2010 census, it had a population of 14,665. Its county seat is Carmi. It is located in the southern portion of Illinois known locally as \"Little Egypt\"."