History · Onarga

Onarga’s post office opened in 1854, and 41% of its homes were built before 1940

More historic than 54% of U.S. towns. What drives it

Below: 1 old photo or paper, maps from 1894 on, and the census since 1880.

1854first post office

0on the National Register

41%homes built before 1940

1old photo or paper

3famous people

Add an old photo Share a memory

From Onarga’s archive · credits on each photo

Quick answers

How Onarga began

When was Onarga founded?

1854

The Onarga post office opened in 1854, the earliest record of the town by name.

First census: 1,061 in 18802020 census: 1,333172 years

How historic is Onarga?

B⁻

More historic than 54% of U.S. towns, on its age, its old homes and the National Register.

What drives the grade ↓

Founding year: the first Onarga post office (Blevins & Helbock, CC0).The full story ↓

History grade

What drives Onarga’s History grade

On its age, its old homes and the National Register, Onarga is more historic than 54% of U.S. towns. Its share of homes from before 1940 holds the grade up; its National Register listings pull it down.

B⁻

HistoryA character grade: shown, never part of Onarga’s overall grade.

Founding era1854, from the first post office: founded 1850–1899, an older era than 37% of U.S. townsC⁺Homes built before 194040.9% of homes (±8.4) · typical IL town 10.6% · U.S. 8.4%A National RegisterNo listings counted · typical IL town 0.5 per 10,000 · U.S. 2.4C

All U.S. towns we grade (21,289)Ahead of 54%

NewerOlder

Few Illinois towns list much on the Register (a typical Illinois town has 0.5 per 10,000 residents, the U.S. 2.4), so Onarga’s 0.0 sits below most of its state (28% of Illinois towns have fewer) while its 0 listings outnumber those of 23% of U.S. towns.

How sure. Graded on any two of the three inputs instead, the letter would range from C− to B+. The pre-1940 share is a Census survey estimate (±8.4 points). The founding year is the first post office, not a stated founding date.

Founding year: the first post office (other dates in Quick answers). 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 Onarga’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.Mapped building by building5 fire insurance maps, 1894 to 1914, drew every building in Onarga.Old housesHalf of Onarga’s homes were built before 1953.

★ What stands out · Help out

Start Onarga’s collection

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

Decades since 1900 with photos

00s10s20s30s40s50s60s70s80s90s

0 of 10 decades. The empty ones are waiting for someone’s album.

Date a photo1 archive item has no date. Guess the decade.+2 Retake an old viewAllan Pinkerton House: stand where they stood+15 Share a family photoSign in to add one+10

Every building

Onarga, building by building, 1894–1914

Fire insurance maps drew every building, what it was made of and what it was used for, so insurers could price the risk of fire. Pick a year, then a sheet.

Onarga fire insurance map, 1894, sheet 1

1894Sheet 1 of 1

Edition

Sheets

BrickWoodStone

Sanborn Map Company, via the Library of Congress. Editions published in 1930 or earlier, which are in the public domain.

The story

How Onarga came to be

From Wikipedia’s history of Onarga.

Read it all →

Onarga was originally laid out in the mid-19th century alongside the development of the railroad from Chicago. Because of its close proximity to Spring Creek, Onarga was one of the first settled areas of Iroquois County. The town grew rapidly but it leveled off and it now maintains small population.

The name Onarga likely comes from an Iroquois name meaning "a place of rocky hills."

Text from Wikipedia, licensed CC BY-SA 4.0.

Timeline

Onarga, 1854 to 1948

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

19th century
1854Post officeThe Onarga post office opens
1869Born hereClarence Z. Hubbell is born here
1869Post officeThe Onarga post office closes
1869Post officeThe Onargo post office opens
1899Born hereJack Crangle is born here
20th century
1948On the mapFirst mapped by the U.S. Geological Survey

By decade

Onarga, decade by decade

Date unknown1 to date

Date?Allan Pinkerton House

Today5 recent

2024Onarga Township Cemetery

2024Onarga Theater

2024Onaga, IL skyline

2015Onarga Public Library

2010Town of

On the map

Onarga on the map, 1948 to 1986

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

1948Buckley 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 Onarga.

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.

Retake this viewAllan Pinkerton House

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

Retake this view · +15

People over time

Onarga, census by census

Between 994 and 1,469 people in every census since 1880.

15 censuses, 1880–2020.

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

Famous people

3 famous people were born in Onarga

Writers, athletes, leaders and more, ranked by how widely they’re known.

See all →

Shane CultraAmerican politician

Jack CrangleAmerican football player and coach · b. 1899

Clarence Z. HubbellAmerican architect · b. 1869

Places that used to be

Lost post offices and burying grounds

Onarga had its own post office from 1854 to 1869.

Onarga

1854–1869

Onargo

1869–today

18501940today

1cemetery inside Onarga

Onarga

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

Questions about Onarga’s history

What year was Onarga founded?

The Onarga post office opened in 1854, the earliest record of the town by name (U.S. post office records).

How does Onarga rank for history?

Onarga is more historic than 54% of U.S. towns. 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.

How old are the homes in Onarga?

41% of Onarga’s homes were built before 1940 (Census estimate, ±8.4 points), against a typical 11% for an Illinois town; the median home was built in 1953.

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 Wikimedia Commons (5), the Library of Congress (1), Wikipedia, Wikidata and Wikipedia for famous people, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock), the USGS Geographic Names Information System and Sanborn fire insurance maps (Library of Congress). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.

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