Washington is a city in and the county seat of Washington County, Iowa, United States. It is part of the Iowa City, Iowa Metropolitan Statistical Area. The population was 7,266 at the 2010 census.
Washington was founded in 1839 as the county seat of the newly established Washington County. In 1854 it became the home of a United Presbyterian College, which was dissolved in 1864. As of 2014, the town has celebrated its 175th anniversary, only 5 years behind the oldest city in Iowa, Dubuque, Iowa.
In 2016, the Guinness World Book of Records certified Washington, Iowa's State Theatre as the, "world's oldest continually operating cinema theatre".
Washington is located at 41°18′0″N 91°41′21″W (41.299941, -91.689175).
According to the United States Census Bureau, the city has a total area of 4.92 square miles (12.74 km2), all land.
As of the census of 2010, there were 7,266 people, 3,048 households, and 1,861 families living in the city. The population density was 1,476.8 inhabitants per square mile (570.2/km2). There were 3,301 housing units at an average density of 670.9 per square mile (259.0/km2). The racial makeup of the city was 92.5% White, 1.4% African American, 0.2% Native American, 0.5% Asian, 0.2% Pacific Islander, 2.7% from other races, and 2.6% from two or more races. Hispanic or Latino of any race were 10.7% of the population.