Alton Township, Madison County, Illinois
| Alton Township | |
| Township | |
| Country | United States |
|---|---|
| State | Illinois |
| County | Madison |
| Elevation | 509 ft (155.1 m) |
| Coordinates | 38°54′14″N 90°09′14″W / 38.90389°N 90.15389°WCoordinates: 38°54′14″N 90°09′14″W / 38.90389°N 90.15389°W |
| Area | 16.74 sq mi (43.4 km2) |
| - land | 15.47 sq mi (40 km2) |
| - water | 1.27 sq mi (3 km2) |
| Population | 27,865 (2010) |
| Density | 1,801.2/sq mi (695.4/km2) |
| Settled | November 2, 1875 |
| Timezone | CST (UTC-6) |
| - summer (DST) | CDT (UTC-5) |
 Location in Madison County
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  Location of Alton Township in Illinois
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 Location of Illinois in the United States
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Alton Township is located in Madison County, Illinois, in the United States. As of the 2010 census, its population was 27,865 and it contained 13,266 housing units.
According to the 2010 census, the township has a total area of 16.74 square miles (43.4 km2), of which 15.47 square miles (40.1 km2) (or 92.41%) is land and 1.27 square miles (3.3 km2) (or 7.59%) is water.
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