St Jacob is located in Illinois. St Jacob, Illinois has a population of 1,055. St Jacob is more family-centric than the surrounding county with 44% households with children. The county percentage for households with children is 28%.
The median household income in St Jacob, Illinois is $87,202. The median household income for the surrounding county is $63,321 compared to the national median of $66,222. The median age of people living in St Jacob is 40.5 years.
The average high temperature in July is 89.07 degrees, with an average low temperature in January of 21.17 degrees. The annual precipitation is 39.19.