Wikipedia doesn’t have a history of Marion Township yet. The photos, dates and memories neighbors add here are how it gets written.
Marion Township is a township in Mercer County, in the U.S. state of Missouri. The city of Mercer is located in the center of the township. The establishment date of Marion Township is unknown. The city of Mercer was previously known as Marion before it was known that there was another place named Marion, it is likely the township was named for the same reason as the city.
Between the 2010 and 2020 censuses its population fell from 826 to 709 (-14%).
Intro from Wikipedia. Population: U.S. Census Bureau.
Timeline
Marion Township, 1897 to 1954
Woven from the archive, old maps, post office records, the National Register and the people born here.
Every edition of the U.S. Geological Survey’s map of Marion Township. Tap a year, or press play to watch the town change.
1954Centerville sheet · 1:250,000
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Marion Township.
Famous people
Famous people close to Marion Township
Nobody well known was born in Marion Township itself, so here are the best known from just nearby.
Lost post offices, places now gone and burying grounds
Another post office, Moore, opened and closed inside today’s town.
Gone or out of use
Duncan SchoolschoolEarly SchoolschoolEast White SchoolschoolGarland SchoolschoolHickory SchoolschoolMiddle Point SchoolschoolUpper Girdner SchoolschoolWhite Oak Schoolschool
10cemeteries and burying grounds inside Marion Township
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.