Nephi ( 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.
Before the area was settled, the site along Salt Creek was first a camping place along the Old Mormon Road to Southern California. Mormon settlers established a settlement at the site in 1851, naming it after the creek. It retained that name until 1882 when the town and its post office became Nephi.
Nephi is in eastern Juab County in the Juab Valley, between the Wasatch and San Pitch Mountains to the east and the lower West Hills and Long Ridge to the west.