Rich County is a county in the U.S. state of Utah. As of the 2020 United States Census, the population was 2,510, making it the third-least populous county in Utah. Its county seat is Randolph, and the largest town is Garden City. The county was created in 1864. It was named for an early LDS apostle, Charles C. Rich. The southern half of Bear Lake and the Bear Lake Valley lies on the northern edge of the county. The Bear River Valley lies in most of the eastern portion of the county.