Nephi is a city in Juab County, Utah, United States. It is part of the Provo–Orem, Utah Metropolitan Statistical Area. The population was 4,733 at the 2000 census. It is the county seat of Juab County. It was settled by Mormon pioneers in 1851, as Salt Creek until 1882 when it acquired its current name. 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.