Santa Clara is a city in Washington County, Utah, United States and is a part of the St. George Metropolitan Area. The population was 7,553 a…Santa Clara is a city in Washington County, Utah, United States and is a part of the St. George Metropolitan Area. The population was 7,553 at the 2020 census, up from 6,003 at the 2010 census, and 4,630 at the 2000 census. The city is a western suburb of St. George.