There are 9 US Post Offices in Harrison County serving a total of 36,224 residents equating to 4,025 residents per post office. It's estimated that approximately 57,818 packages are handled across the 9 county post offices annually. Harrison County is a county on the eastern border of the U.S. state of Texas. As of the 2010 census, its population was 65,631. The county seat is Marshall. The county was created in 1839 and organized in 1842. It is named for Jonas Harrison, a lawyer and Texas revolutionary. Harrison County comprises the Marshall, TX Micropolitan Statistical Area, which is also included in the Longview\u2013Marshall, TX Combined Statistical Area. It is located in the Ark-La-Tex region. Harrison County, formerly a Democratic party stronghold, is represented in the Texas House of Representatives by Republican Chris Paddie, a former Marshall mayor."