Jefferson County is one of the 39 counties of the US state of Washington. In the year 2000, the population was of 25,953 inhabitants. The county seat is Port Townsend, which is the only city incorporated into the county. Jefferson County was founded on December 22,1852, by the Legislature of the Oregon Territory. It owes its name to Thomas Jefferson. The Hood Canal Bridge connects Jefferson County with Kitsap County, Washington.