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.
Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021). How TownRatings grades history →
From Wikipedia, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock) and the USGS Geographic Names Information System. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.