Allendale is located in Illinois. Allendale, Illinois has a population of 709. Allendale is more family-centric than the surrounding county with 34.66% of the households containing married families with children. The county average for households married with children is 25.2%.
The median household income in Allendale, Illinois is $75,234. The median household income for the surrounding county is $49,680 compared to the national median of $69,021. The median age of people living in Allendale is 30.6 years.
The average high temperature in July is 87.8 degrees, with an average low temperature in January of 22.6 degrees. The average rainfall is approximately 46.8 inches per year, with 11.3 inches of snow per year.
