Washington is a city in Daviess County, Indiana. The population was 11,509 at the time of the 2010 census. The city is the county seat of Daviess County. It is also the principal city of the Washington, Indiana Micropolitan Statistical Area, which comprises all of Daviess County and had an estimated 2017 population of 31,648. History Washington was platted in 1815. It was named from Washington Township. The railroad was built through Washington in 1857. By 1889, it was a major depot and repair yard for the Ohio and Mississippi Railroad. The Baltimore and Ohio Railroad took over the line in 1893. During this time, the railroad employed over 1,000 workers. On November 17, 2013, an EF2 tornado tore through the western edge of the city destroying 20 homes and severely damaging 20 others. The Magnus J. Carnahan House, Daviess County Courthouse, Thomas Faith House, Robert C. Graham House, Dr. John A. Scudder House, Washington Commercial Historic District, and Dr. Nelson Wilson House are listed on the National Register of Historic Places. Geography Washington is located at (38.658207, -87.175111). According to the 2010 census, Washington has a total area of , of which (or 99.22%) is land and (or 0.78%) is water. Climate Washington has a humid subtropical climate (Köppen classification Cfa), with four distinct seasons. Winters are cool to chilly with moderate snowfall, while summers are warm and humid. Demographics 2010 census As of the census of 2010, there were 11,509 people, 4,558 households, and 2,849 families living in the city. The population density was . There were 5,067 housing units at an average density of . The racial makeup of the city was 89.2% White, 1.1% African American, 0.3% Native American, 1.1% Asian, 0.1% Pacific Islander, 6.4% from other races, and 1.9% from two or more races. Hispanic or Latino of any race were 9.6% of the population. There were 4,558 households, of which 33.4% had children under the age of 18 living with them, 41.8% were married couples living together, 15.2% had a female householder with no husband present, 5.5% had a male householder with no wife present, and 37.5% were non-families. 31.8% of all households were made up of individuals, and 14.9% had someone living alone who was 65 years of age or older. The average household size was 2.43 and the average family size was 3.04. The median age in the city was 37.3 years.