Nephi (/ˈniːfaɪ/ NEE-fy) is a city in Juab County, Utah, United States. It is part of the Provo–Orem metropolitan area. The population was 5,389 at the 2010 census and an estimated 6,111 in 2018. It is the county seat of Juab County. It was settled by Mormon pioneers in 1851 as “Salt Creek”, and it acquired its current name in 1882. It is the principal city in the Juab Valley, an agricultural area. Nephi was named after Nephi, son of Lehi, from the Book of Mormon.
As of the census of 2000, there were 4,733 people, 1,430 households, and 1,149 families residing in the city. The population density was 1,133.8 people per square mile (438.2/km²). There were 1,552 housing units at an average density of 371.8 per square mile (143.7/km²). The racial makeup of the city was 96.98% White, 0.11% African American, 0.63% Native American, 0.46% Asian, 0.02% Pacific Islander, 0.97% from other races, and 0.82% from two or more races. Hispanic or Latino of any race were 2.45% of the population.
There were 1,430 households out of which 50.1% had children under the age of 18 living with them, 71.1% were married couples living together, 6.2% had a female householder with no husband present, and 19.6% were non-families. 18.3% of all households were made up of individuals and 9.6% had someone living alone who was 65 years of age or older. The average household size was 3.24 and the average family size was 3.72.
In the city, the population was spread out with 37.8% under the age of 18, 9.0% from 18 to 24, 25.4% from 25 to 44, 16.9% from 45 to 64, and 10.9% who were 65 years of age or older. The median age was 28 years. For every 100 females, there were 101.2 males. For every 100 females age 18 and over, there were 96.0 males.
The median income for a household in the city was $38,918, and the median income for a family was $43,327. Males had a median income of $34,792 versus $21,027 for females. The per capita income for the city was $13,154. About 7.5% of families and 10.0% of the population were below the poverty line, including 8.7% of those under age 18 and 18.2% of those age 65 or over.