Smithfield is a city in Cache County, Utah, United States. The population was 9,495 at the 2010 United States Census, with an estimated population of 12,025 in 2019. It is included in the Logan, Utah–Idaho Metropolitan Statistical Area, and is the second largest city in the area after Logan, the county seat. Smithfield is home to one public high school and three public elementary schools.

Cache County is a county located in the Wasatch Front region of Utah. As of the 2020 United States Census, the population was 133,154, with an estimated 140,173 in 2022. Its county seat and largest city is Logan. Cache County is one of two counties included in the Logan metropolitan area, alongside Franklin County, Idaho.