Smithfield is a home rule-class city in Henry County, Kentucky, United States.

According to the United States Census Bureau, Smithfield has a total area of 0.14 square miles (0.35 km2), all land.

There were 47 housing units at an average density of 351.6 per square mile (135.8/km2).

37.2% of all households were made up of individuals, and 14.0% had someone living alone who was 65 years of age or older.

There were 10.0% of families and 18.7% of the population living below the poverty line, including 25.0% of under eighteens and none of those over 64.