Allendale, IL is a city located in Wabash County, Illinois and has a land area of 38.20 square miles (98.94 km2). The water area for the city is 0.80 square miles or 2.07 km2. There is one unique zip code in Allendale, Illinois and it is 62410. The area code(s) for Allendale is 618.
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