- Nephi is a small city located in Juab County, Utah, United States. It is situated in the central part of the state and has a population of approximately 6,800 people as of 2020. Nephi serves as the county seat of Juab County and is known for its small-town charm and rural surroundings. The city is named after the Book of Mormon prophet Nephi and has a rich history dating back to the mid-1800s. Nephi offers a variety of recreational activities, including hiking, fishing, and hunting, thanks to its proximity to the mountains and the nearby Lake Yuba State Park. The city also hosts annual events such as the Juab County Fair and the Ute Stampede Rodeo.