Southwestern Illinois RC&D, Inc.

Southwestern Illinois RC&D - Regional Info

Madison County was formed before Illinois became a state. At the time of formation, the area was part of the Illinois Territory. In 1812, Madison County encompassed the majority of the state of Illinois. All of Illinois north of the current southern boundary of Madison County between the Mississippi and Wabash Rivers was part of the county.

The size of the county was quickly reduced. In 1814, the formation of Edwards County removed almost half of the area (the eastern part). The final boundary change occured in 1843, when a small portion on the northeast corner of Madison County became part of Bond County.

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