Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Sevier County is a county located in the U.S. state of Utah. It formed on January 16, 1865, split off from Sanpete County to the north. It was named for the nearby Sevier River. As of 2000 the population was 18,842, and by 2005 was estimated at 19,386. Its county seat and largest city is Richfield. According to the U.S. Census Bureau, the county has a total area of 1,918 square miles (4,968 km²), of which, 1,910 square miles (4,948 km²) of it is land and 8 square miles (21 km²) of it (0.42%) is water. As of the census of 2000, there were 18,842 people, 6,081 households, and 4,907 families residing in the county. The population density was 10 people per square mile (4/km²). There were 7,016 housing units at an average density of 4 per square mile (1/km²). The racial makeup of the county was 95.61% White, 0.27% Black or African American, 2.00% Native American, 0.26% Asian, 0.09% Pacific Islander, 0.79% from other races, and 0.99% from two or more races. 2.55% of the population were Hispanic or Latino of any race.