There are 14 US Post Offices in Jackson County serving a total of 157,109 residents equating to 11,222 residents per post office. It's estimated that approximately 250,763 packages are handled across the 14 county post offices annually. Jackson County is a county located in the U.S. state of Oregon. As of the 2010 census, the population was 203,206. The county seat is Medford. The county is named for Andrew Jackson, the seventh president of the United States. Jackson County comprises the Medford, OR Metropolitan Statistical Area. There are 11 incorporated cities and 34 unincorporated communities in Jackson County; the largest is Medford, which has been the county seat since 1927."