Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Washington County (standard abbreviation: WS) is a county located in the U.S. state of Kansas. As of 2000, the population was 6,483. Its county seat and largest town is the city of Washington.Washington County was a prohibition, or "dry", county until the Kansas Constitution was amended in 1986 and voters approved the sale of alcoholic liquor by the individual drink with a 30% food sales requirement.According to the U.S. Census Bureau, the county has a total area of 899 square miles (2,328 km²), of which, 898 square miles (2,327 km²) of it is land and 0 square miles (1 km²) of it (0.04%) is water.