Smithfield is a village in Fulton County, Illinois, United States. The population was 214 at the 2000 census. The village is named in honor of Dr. Joseph N. Smith.
Smithfield is located at 40°28′23″N 90°17′34″W / 40.47306°N 90.29278°W / 40.47306; -90.29278 (40.473086, -90.292639).
According to the United States Census Bureau, the village has a total area of 0.5 square miles (1.2 km²), all of it land.