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Allendale is located in Illinois. Allendale, Illinois has a population of 451. Allendale is more family-centric than the surrounding county with 35% of the households containing married families with children. The county average for households married with children is 28%.

The median household income in Allendale, IL is $53,333. The median household income for the surrounding county is $47,393 compared to the national median of $57,525. The median age of people living in Allendale is 41 years old.

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