Wikipedia doesn’t have a history of Flat Branch Township yet. The photos, dates and memories neighbors add here are how it gets written.
Flat Branch Township is located in Shelby County in the U.S. state of Illinois. As of the 2010 census, its population was 443 and it contained 181 housing units.
Between the 2010 and 2020 censuses its population fell from 443 to 420 (-5%).
Intro from Wikipedia. Population: U.S. Census Bureau.
Places that used to be
Lost post offices, old corners, places now gone and burying grounds
Two other post offices opened and closed inside today’s town.
Every edition of the U.S. Geological Survey’s map of Flat Branch Township. Tap a year, or press play to watch the town change.
1949Dalton City sheet · 1:62,500
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Flat Branch Township.
Famous people
Famous people close to Flat Branch Township
Nobody well known was born in Flat Branch Township itself, so here are the best known from just nearby.
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 U.S. Geological Survey historical maps, 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.