High Quality Content by WIKIPEDIA articles! Utah County is a county located in the U.S. state of Utah. As of 2000, the population was 368,536 and by 2008 was estimated at 530,837. It was named for the Spanish name (Yuta) for the Ute Indians. The county seat and largest city is Provo. The center of population of Utah is located in Utah County, in the city of Lehi. Utah County is part of the Provo-Orem Metropolitan Statistical Area. According to the U.S. Census Bureau, the county has a total area of 2,141 square miles (5,545 km²), of which, 1,998 square miles (5,176 km²) of it is land and 143 square miles (369 km²) of it (6.66%) is water.