- Jefferson County, Washington has 1,803.7 square miles of land area and is the 18th largest county in Washington by total area. Jefferson County, Washington is bordered by Grays Harbor County, Washington, Kitsap County, Washington, Clallam County, Washington, Island County, Washington, Mason County, Washington, and San Juan County, Washington.
- Jefferson County, Oregon (data.census.gov)
Jefferson County, Oregon has 1,781.7 square miles of land area and is the 19th largest county in Oregon by total area. Jefferson County, Oregon is bordered by Wheeler County, Oregon, Crook County, Oregon, Linn County, Oregon, Marion County, Oregon, Wasco County, Oregon, and Deschutes County, Oregon.
And he went forth again by the sea side; and all the multitude resorted unto him, and he taught them.
Mark 2:13 KJV