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Lyndon Il Lyndon Bridge1Photo: IvoShandor · CC BY 2.5
–Not graded
History · Lyndon Township

Lyndon Township’s post office opened in 1838, and 16% of its homes were built before 1940

Below: 1 old photo or paper from 1850 on.

1838first post office
0on the National Register
16%homes built before 1940
1old photo or paper
Add an old photoShare a memory
From Lyndon Township’s archive · credits on each photo
Quick answers

How Lyndon Township began

When was Lyndon Township founded?

1838

The Lyndon Township post office opened in 1838, the earliest record of the town by name. Another post office, Denrock (1890), opened inside today’s town and later closed.

2020 census: 930188 years
Founding year: the first Lyndon Township post office (Blevins & Helbock, CC0).

What stands out about Lyndon 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 writtenOnly 1 old photo is in the public archives. The rest are in attics and albums.Lost villages1 post office opened and closed inside today’s Lyndon Township, and 4 old place names are still on the map.Deep rootsA post office since 1838: 188 years of Lyndon Township.Old housesHalf of Lyndon Township’s homes were built before 1964.
★ What stands out · Help out

Start Lyndon Township’s collection

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

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
0 of 10 decades. The empty ones are waiting for someone’s album.
Retake an old view1940 Census Enumeration District Descri…: stand where they stood+15Share a family photoSign in to add one+10
Places that used to be

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

Another post office, Denrock, opened and closed inside today’s town.

Hamlets and corners on the map
DenrockHamilton CornersSandsValley Vista Estates
Gone or out of use
Greene SchoolschoolHiland AirportairportLangdon SchoolschoolRichman SchoolschoolThe Bend Schoolschool
1cemetery inside Lyndon Township
Lyndon

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

Timeline

Lyndon Township, 1850 to 1911

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

  1. 19th century
  2. 1850In the archive1940 Census Enumeration District Descriptions - Illinois - Whiteside County - ED 98-20, E…
  3. 1890Post officeThe Denrock post office opens
  4. 20th century
  5. 1911Post officeThe Denrock post office closes
The story so far

Lyndon Township, in brief

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

Lyndon is a village in Whiteside County, Illinois, United States. The population was 537 at the 2020 census, down from 648 in the 2010 census.

Its first post office opened in 1838. Between the 2010 and 2020 censuses its population fell from 1,057 to 930 (-12%).

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

By decade

Lyndon Township, decade by decade

One decade in the archive so far: the 1850s. Scroll each row; tap a photo for its story.

1850s1 item
1940 Census Enumeration District Descriptions - Illinois - Whiteside County - ED 98-20, ED 98-21, ED 98-22, ED 98-23, E…18501940 Census Enumeration District Descriptions - Illin…
Today2 recent
Lyndon Township Whiteside2007Lyndon Township WhitesideILMap-doton-Lyndon2006ILMap-doton-Lyndon
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.

1940 Census Enumeration District Descriptions - Illinois - Whiteside County - ED 98-20, ED 98-21, ED 98-22, ED 98-23, E…
Retake this view1940 Census Enumeration District Descriptions - Illinois - Whiteside County - ED 98-20, ED 98-21, ED 98-22, ED 98-23, E…, 1850

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

Retake this view · +15
Stories next door

History across the town line

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

Prophetstown Township1 historic placeAHume TownshipIts storynot graded: under 1,000 residents or part of its townMount Pleasant Township2 historic placesA+Fenton TownshipIts storynot graded: under 1,000 residents or part of its townHopkins TownshipIts storyC+

Questions about Lyndon Township’s history

What year was Lyndon Township founded?

The Lyndon Township post office opened in 1838, 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 (3), 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.