Helvetia Township, Madison County, Illinois
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|Elevation||489 ft (149.0 m)|
|Area||36.2 sq mi (93.8 km2)|
|- land||35.88 sq mi (93 km2)|
|- water||0.32 sq mi (1 km2)|
|Density||241/sq mi (93.1/km2)|
|Settled||November 2, 1875|
|- summer (DST)||CDT (UTC-5)|
Helvetia Township was organized in 1876.
According to the 2010 census, the township has a total area of 36.2 square miles (94 km2), of which 35.88 square miles (92.9 km2) (or 99.12%) is land and 0.32 square miles (0.83 km2) (or 0.88%) is water.
- "Population, Housing Units, Area, and Density: 2010 - County -- County Subdivision and Place -- 2010 Census Summary File 1". United States Census. Retrieved 2013-05-28.
- Norton, William T. (1912). Centennial History of Madison County, Illinois, and Its People, 1812 to 1912. The Lewis Publishing Co. p. 525.
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