Santaquin is a city in Utah and Juab counties in the U.S. state of Utah. It is part of the Provo–Orem metropolitan area. The population was 13,72…Santaquin is a city in Utah and Juab counties in the U.S. state of Utah. It is part of the Provo–Orem metropolitan area. The population was 13,725 at the 2020 census. Santaquin lies southeast of Utah Lake in southern Utah County, with a small portion extending south into Juab County. It is bordered to the northwest by Genola and to the north by unincorporated Spring Lake. Interstate 15 passes through the city, with access from Exits 242 and 244. I-15 leads north 21 miles to Provo and south 19 miles to Nephi. U.S. Route 6 passes through Santaquin as Main Street and leads west 24 miles to Silver City. Utah State Route 198 leads north from I-15 5 miles to Payson.