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Erin Township is located in Stephenson County, Illinois. As of the 2010 census, its population was 410 and it contained 177 housing units. The unincorporated community of Eleroy is located in the township.
Erin Township, Stephenson County, Illinois Wikipedia
According to the 2010 census, the township has a total area of 18.15 square miles (47.0 km2), all land.