Washington is a city in Washington County, Utah, United States. The population was 8,186 at the 2000 census, and 17,881 as of the 2009 estimates. Washington is east of St. George, the county seat.
According to the United States Census Bureau, the city has a total area of 31.5 square miles (81.7 km²), of which 31.5 square miles (81.7 km²) is land and 0.04 square mile (0.1 km²) (0.10%) is water.
As of the census of 2000, there were 8,186 people, 2,614 households, and 2,117 families residing in the city. The population density was 259.7 people per square mile (100.2/km²). There were 3,199 housing units at an average density of 101.5 per square mile (39.2/km²). The racial makeup of the city was 94.31% White, 0.37% African American, 1.71% Native American, 0.29% Asian, 0.10% Pacific Islander, 2.15% from other races, and 1.08% from two or more races. Hispanic or Latino of any race were 4.69% of the population.