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History · Leidy Township

Leidy Township’s post office opened in 1853

Most of Leidy Township was built recently: 8% of its homes predate 1940 and the median home dates from 1968. Below: maps from 1946 on and the census since 1980.

1853first post office
0on the National Register
8%homes built before 1940
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Photo: Nicholas · CC BY 2.0
Quick answers

How Leidy Township began

When was Leidy Township founded?

1853

The Leidy Township post office opened in 1853, the earliest record of the town by name. Three smaller post offices, Leidy (1853), Hammersley Fork (1859) and Tamarack (1907), opened inside today’s town and later closed.

First census: 263 in 19802020 census: 155173 years
Founding year: the first Leidy Township post office (Blevins & Helbock, CC0).

What stands out about Leidy Township’s past

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

A history waiting to be writtenNo old photos of Leidy Township are in the public archives yet. The rest are in attics and albums.Lost villages3 post offices opened and closed inside today’s Leidy Township, and 3 old place names are still on the map.
★ What stands out · Help out

Start Leidy Township’s collection

The first neighbors to add old photos shape how Leidy Township’s history is told.

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
0 of 10 decades. The empty ones are waiting for someone’s album.
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Places that used to be

Lost post offices, old corners and burying grounds

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

Leidy
1853–1916
Hammersley Fork
1859–1972
Tamarack
1907–1945
18501940today
Hamlets and corners on the map
Hammersley ForkLeidyTamarack
5cemeteries and burying grounds inside Leidy Township
Gospel CampLaurel HillMcCoyNew Maple GroveSummerson

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

The story so far

Leidy Township, in brief

Wikipedia doesn’t have a history of Leidy Township yet. The photos, dates and memories neighbors add here are how it gets written.

Leidy Township is a township that is located in Clinton County, Pennsylvania, United States. The population was 155 at the time of the 2020 census, down from 180 in 2010. Kettle Creek State Park is located in Leidy Township.

Its first post office opened in 1853. Between the 2010 and 2020 censuses its population fell from 180 to 155 (-14%).

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

Timeline

Leidy Township, 1853 to 1972

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

  1. 19th century
  2. 1853Post officeThe Leidy post office opens
  3. 1859Post officeThe Hammersley Fork post office opens
  4. 20th century
  5. 1907Post officeThe Tamarack post office opens
  6. 1916Post officeThe Leidy post office closes
  7. 1945Post officeThe Tamarack post office closes
  8. 1946On the mapFirst mapped by the U.S. Geological Survey
  9. 1972Post officeThe Hammersley Fork post office closes
By decade

Leidy Township, decade by decade

Today2 recent
Leidy Township Roadside2008Leidy Township RoadsideAlvin R. Bush Dam, Pennsylvania2007Alvin R. Bush Dam, Pennsylvania
On the map

Leidy Township on the map, 1946 to 1971

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

Leidy Township on the 1946 USGS mapLeidy Township on the 1971 USGS map1946Hammersley Fork sheet · 1:24,000

U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Leidy Township.

People over time

Leidy Township, census by census

0100200198020002020Peak: 263

Between 155 and 263 people in every census since 1980.

5 censuses, 1980–2020.

U.S. Census Bureau decennial counts, from the census table on Leidy Township’s Wikipedia page.

Stories next door

History across the town line

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

Chapman TownshipIts storynot graded: under 1,000 residents or part of its townNoyes TownshipIts storynot graded: under 1,000 residents or part of its townWharton TownshipIts storynot graded: under 1,000 residents or part of its townEast Keating Township1 historic placenot graded: under 1,000 residents or part of its townStewardson TownshipIts storynot graded: under 1,000 residents or part of its town

Questions about Leidy Township’s history

What year was Leidy Township founded?

The Leidy Township post office opened in 1853, the earliest record of the town by name (U.S. post office records).

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). How TownRatings grades history →

From Wikimedia Commons (2), 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.