Washington County is a county located in the U.S. state of Kansas. Its county seat and largest city is Washington. As of the 2020 census, the county population was 5,530. The county was named for George Washington, the 1st president of the United States.

The 2004 United States presidential election in Kansas took place on November 2, 2004 as part of the 2004 United States presidential election. Voters chose six representatives, or electors to the Electoral College, who voted for president and vice president.