Old Mill Creek is located in Illinois. Old Mill Creek, Illinois has a population of 428. Old Mill Creek is more family-centric than the surrounding county with 41% households with children. The county percentage for households with children is 35%.
The median household income in Old Mill Creek, Illinois is $123,948. The median household income for the surrounding county is $91,525 compared to the national median of $66,222. The median age of people living in Old Mill Creek is 41 years.
The average high temperature in July is 82.02 degrees, with an average low temperature in January of 12.06 degrees. The annual precipitation is 34.61.