Albert Antrei Utah History Encyclopedia, 1994 Manti is the county seat of Sanpete County, Utah. Manti, Utah, has a population in 1992 of approximately 2,000 people. It is situated in the Sanpete Valley of central Utah, at an elevation of slightly over 5,500 feet. Manti was settled in late November 1849 by 224 men, women, and children. The group left …