There are 27 US Post Offices in Travis County serving a total of 679,495 residents equating to 25,166 residents per post office. It's estimated that approximately 1,084,550 packages are handled across the 27 county post offices annually. Travis County is a county located in south central Texas. As of the 2010 census, the population was 1,024,266; the estimated population in 2014 was 1,151,145. It is the fifth-most populous county in Texas. Its county seat is Austin, the capital of Texas. The county was established in 1840 and is named in honor of William Barret Travis, the commander of the Republic of Texas forces at the Battle of the Alamo. Travis County is part of the Austin-Round Rock Metropolitan Statistical Area. It is located along the Balcones Fault, the boundary between the Edwards Plateau to the west and the Blackland Prairie to the east."