Jackson County is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the population was 223,259. 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.