Mayfield is a town in southwestern Sanpete County, Utah, United States. The population was 496 at the 2010 census. Mayfield was settled in 1871. Some of the area's founding families included the Andersons, Petersons, Petersens, Bartholomews, Jensens, Sorensens, and Willdens. When the first white settlers arrived, they learned that this area was considered …Mayfield is a town in southwestern Sanpete County, Utah, United States. The population was 496 at the 2010 census. Mayfield was settled in 1871. Some of the area's founding families included the Andersons, Petersons, Petersens, Bartholomews, Jensens, Sorensens, and Willdens. When the first white settlers arrived, they learned that this area was considered sacred by the Indians, who said it was a "healing ground." It is said that no fighting has ever occurred in Mayfield.