St Elmo is located in Illinois. St Elmo, Illinois has a population of 1,229. St Elmo is less family-centric than the surrounding county with 21% households with children. The county percentage for households with children is 25%.
The median household income in St Elmo, Illinois is $47,140. The median household income for the surrounding county is $49,580 compared to the national median of $66,222. The median age of people living in St Elmo is 39.3 years.
The average high temperature in July is 87.07 degrees, with an average low temperature in January of 17.86 degrees. The annual precipitation is 39.04.