Jefferson County is a county located in the U.S. state of Washington. As of the 2010 census, the population was 29,872. The county seat and only incorporated city is Port Townsend. The county is named for Thomas Jefferson.
Jefferson County was formed out of Thurston County on December 22, 1852, by the legislature of Oregon Territory, and included the northern 4,854 square miles (12,571.8 km²) portion of the Olympic Peninsula. On April 26, 1854, the legislature of Washington Territory created Clallam County from the northwestern 2,670 square miles (6,915.3 km²) portion of this original area.
The Hood Canal Bridge connects Jefferson County to Kitsap County, Washington. The Coupeville-Port Townsend route of the Washington State Ferries connects the county to Whidbey Island in Island County, Washington.
According to the U.S. Census Bureau, the county has a total area of 2,183 square miles (5,650 km²), of which 1,804 square miles (4,670 km²) is land and 379 square miles (980 km²) (17%) is water.
As of the 2010 United States Census, there were 29,872 people, 14,049 households, and 8,394 families residing in the county. The population density was 16.6 inhabitants per square mile (6.4/km²). There were 17,767 housing units at an average density of 9.9 per square mile (3.8/km²). The racial makeup of the county was 91.0% white, 2.3% American Indian, 1.6% Asian, 0.8% black or African American, 0.2% Pacific islander, 0.7% from other races, and 3.4% from two or more races. Those of Hispanic or Latino origin made up 2.8% of the population. In terms of ancestry, 20.8% were English, 20.3% were German, 13.9% were Irish, 8.3% were Norwegian, 5.9% were Scottish, and 4.2% were American.
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