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Delavan Township, Tazewell County, Illinois. Delavan Township is located in Tazewell County, Illinois. As of the 2010 census, its population was 2,061 and it contained 902 housing units. Contents.
Delevan is located in northeastern Cattaraugus County in the east-central part of the town of Yorkshire at 42Â°29â²N 78Â°29â²W / 42.483Â°N 78.483Â°W / 42.483; -78.483 (42.4896, -78.4798). According to the United States Census Bureau, the village has a total area of 0.99 square miles (2.57 km2), all of it land.