Smithfield is a city in Cache County, Utah, United States. The population was 9,495 at the 2010 census. It is included in the Logan, Utah-Idaho (partial) Metropolitan Statistical Area, and is the second largest city in the area after the county seat, Logan.
Smithfield is located at 41°50′7″N 111°49′42″W / 41.83528°N 111.82833°W / 41.83528; -111.82833 (41.835253, -111.828388).
According to the United States Census Bureau, the city has a total area of 4.3 square miles (11.2 km²), all of it land.