Jefferson County is in Olympic Peninsula Washington. Of the 39 counties in the state, Jefferson County is 15th in terms of its size (2,187 square miles). Recent Land Network data totals almost 1,000 acres of residential land for sale in Washington's Jefferson County, which is valued at a combined $22 million. The average price of residential land for sale in Jefferson County was $1 million. Browse all residential land and rural property for sale in Washington to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.