Smithton is a city located in St. Clair County Illinois. Smithton has a 2020 population of 4,201. Smithton is currently declining at a rate of -0.66% annually and its population has decreased by -2.30% since the most recent census, which recorded a population of 4,300 in 2010. Smithton reached it's highest population of 4,315 in 2011.
The average household income in Smithton is $89,001 with a poverty rate of 2.31%. The median rental costs in recent years comes to $743 per month, and the median house value is $164,300. The median age in Smithton is 43.3 years, 37.3 years for males, and 45.8 years for females.