There are 5 US Post Offices in Orange County serving a total of 62,050 residents equating to 12,410 residents per post office. It's estimated that approximately 99,039 packages are handled across the 5 county post offices annually. Orange County is a county in the U.S. state of Texas. As of the 2010 census, its population was 81,837. The county seat is Orange. Orange County is included in the Beaumont-Port Arthur, TX Metropolitan Statistical Area. It is located in the very southeastern corner of Texas, with a boundary with Louisiana, within the Golden Triangle of Texas.