Hecker is a village in Monroe County in the U.S state of Illinois. The population was 429 at the 2020 census, down from 481 in 2010. Hecker was originally named "Freedom". The town was laid out on land of Theodore Hilgard. It was platted and surveyed by Thomas Singleton, county surveyor, December 18, 1840, the first home being built in 18…Hecker is a village in Monroe County in the U.S state of Illinois. The population was 429 at the 2020 census, down from 481 in 2010. Hecker was originally named "Freedom". The town was laid out on land of Theodore Hilgard. It was platted and surveyed by Thomas Singleton, county surveyor, December 18, 1840, the first home being built in 1849. In 1895 the citizens of what was then Freedom decided to incorporate, to facilitate improvements to the nascent town's infrastructure. Due to complaints from the Post Office, there being another town calling itself Freedom in Illinois, they were forced to change the name. Friedrich Franz Karl Hecker, a former German revolutionary, orator, and American Civil War colonel, whose farm was near Summerfield in adjacent St. Clair County, was known to and well respected by the town's inhabitants, and they decided to honor him by naming the town after him.