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A+History
History · Marion Township

26% of Marion Township’s homes were built before 1940

More historic than 95% of U.S. towns · #61 of 993 in Ohio. What drives it

10 places in town are on the National Register. Below: 12 old photos and papers and maps from 1908 on.

10on the National Register
26%homes built before 1940
12old photos & papers
From Marion Township’s archive · credits on each photo
Quick answers

About Marion Township’s history

How historic is Marion Township?

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More historic than 95% of U.S. towns, on its age, its old homes and the National Register.

What drives the grade ↓
History grade

What drives Marion Township’s History grade

On its age, its old homes and the National Register, Marion Township is more historic than 95% of U.S. towns, #61 of 993 in Ohio. All 2 inputs are above most U.S. towns; its National Register listings ranks highest and its share of homes from before 1940 lowest.

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HistoryA character grade: shown, never part of Marion Township’s overall grade.
All U.S. towns we grade (21,289)Ahead of 95%
NewerOlder
Ohio towns of 2,500+ (993)Ahead of 94%

Ohio towns list about as much on the Register as the country (a typical Ohio town has 2.9 per 10,000 residents, the U.S. 2.4), so Marion Township’s 105 sits above most of its state (93% of Ohio towns have fewer) while its 35 historic buildings outnumber those of 83% of U.S. towns.

How sure. Graded on two of the three inputs, so a change in either one moves the letter more than it would with three. The pre-1940 share is a Census survey estimate (±8.1 points).

Founding year: our sources. Homes: Census ACS 2020–24. National Register: National Park Service, May 2026 list; each listing counted once (boundary changes and added documentation belong to their listing), and a historic district counts its contributing buildings. How TownRatings grades history →

What stands out about Marion Township’s past

Read from the archive, the National Register and the record. The page puts what stands out first.

★ What stands out · Places that used to be

Lost post offices, old corners, places now gone and burying grounds

Four other post offices opened and closed inside today’s town.

Maria Stein
1850–today
Carthagena
1852–1962
Cassella
1878–1905
Saint Rosa
1878–1905
Sebastian
1882–1904
18501940today
Hamlets and corners on the map
CarthagenaCassellaMaria SteinSaint JohnsSaint RosaSebastianSteinman
Gone or out of use
Cassella Post Officepost officePuthoff SchoolschoolSaint Rosa Post Officepost officeSebastian Post Officepost office
7cemeteries and burying grounds inside Marion Township
CassellaMaria Stein ConventPrecious BloodSaint Aloysious CatholicSaint Johns CatholicSaint Rose CatholicSaint Sebastian Catholic

US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).

On the map

Marion Township on the map, 1908 to 1982

Every edition of the U.S. Geological Survey’s map of Marion Township. Tap a year, or press play to watch the town change.

Marion Township on the 1908 USGS mapMarion Township on the 1961 USGS mapMarion Township on the 1973 USGS mapMarion Township on the 1982 USGS map1908St Henry 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 Marion Township.

On the National Register

10 historic places in Marion Township

The country’s official list of buildings and places worth saving.

places listed
10
National Historic Landmarks
0
none yet
historic buildings protected
35
each building in a district counts
first listed
1976
Maria Stein Convent
All 9 listings

National Park Service, National Register of Historic Places. Photos from Wikimedia Commons, credited on each place’s page.

The story so far

Marion Township, in brief

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 one of the fourteen townships of Mercer County, Ohio, United States. The 2020 census found 3,322 people in the township.

Between the 2010 and 2020 censuses its population grew from 2,970 to 3,322 (+12%).

Intro from Wikipedia. Population: U.S. Census Bureau.

Timeline

Marion Township, 1850 to 1962

Woven from the archive, old maps, post office records, the National Register and the people born here.

  1. 19th century
  2. 1850Post officeThe Maria Stein post office opens
  3. 1852Post officeThe Carthagena post office opens
  4. 1861BuiltSt. Charles Seminary and Chapel is built
  5. 1878Post officeThe Cassella post office opens
  6. 20th century
  7. 1905In the archiveMarion Steam Shovel Works
  8. 1905Post officeThe Cassella post office closes
  9. 1908On the mapFirst mapped by the U.S. Geological Survey
  10. 1912In the archiveHarding Memorial
  11. 1920In the archiveC.B. Huntress, children Marion, Douglas, & Jack
  12. 1962Post officeThe Carthagena post office closes
By decade

Marion Township, decade by decade

3 decades in the archive, from the 1900s to the 1920s. Scroll each row; tap a photo for its story.

Then & now

Stand where they stood

No then-and-now pairs yet. Take a photo from the same spot as an old one and they appear here side by side.

Marion Steam Shovel Works
Retake this viewMarion Steam Shovel Works, 1905

Find the spot, match the angle, and add your photo. It becomes the first then-and-now pair on Marion Township’s page.

Retake this view · +15
Help out

Finish Marion Township’s story

Most archives stop around 1920. The photos from after that are in family albums, not libraries.

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
3 of 10 decades. The empty ones are waiting for someone’s album.
Stories next door

History across the town line

Each neighbor’s History grade, on the same three inputs.

Questions about Marion Township’s history

How does Marion Township rank for history?

Marion Township is more historic than 95% of U.S. towns, #61 of 993 in Ohio. The History grade combines the town’s founding era, the share of homes built before 1940 and its National Register listings. It’s a character grade, so it isn’t part of the overall grade. How it works.

What is on the National Register in Marion Township?

10 listings: 9 buildings, among them the Maria Stein Convent (listed 1976, the first). 35 historic buildings in all.

How old are the homes in Marion Township?

26% of Marion Township’s homes were built before 1940 (Census estimate, ±8.1 points), against a typical 15% for an Ohio town; the median home was built in 1973.

Memory lane

What the archives can’t tell you, neighbors can.

Town Square →
Start a conversation
Sources

Where this page comes from

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).

From the Library of Congress (12), the National Register of Historic Places (9), 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.