Allendale is located in Illinois. Allendale, Illinois has a population of 454. Allendale is more family-centric than the surrounding county with 38% households with children. The county percentage for households with children is 26%.
The median household income in Allendale, Illinois is $69,375. The median household income for the surrounding county is $52,863 compared to the national median of $66,222. The median age of people living in Allendale is 40.8 years.
The average high temperature in July is 88.74 degrees, with an average low temperature in January of 21.05 degrees. The annual precipitation is 43.61.