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History · Arimo

Arimo’s post office opened in 1912, and 37% of its homes were built before 1940

Below: maps from 1968 on and the census since 1930.

1912first post office
0on the National Register
37%homes built before 1940
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Quick answers

How Arimo began

When was Arimo founded?

1912

The Arimo post office opened in 1912, the earliest record of the town by name. Another post office, Oneida (1878), opened inside today’s city and later closed.

First census: 290 in 19302020 census: 354114 years
Founding year: the first Arimo post office (Blevins & Helbock, CC0).

What stands out about Arimo’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 Arimo are in the public archives yet. The rest are in attics and albums.Old housesHalf of Arimo’s homes were built before 1950.
★ What stands out · Help out

Start Arimo’s collection

The first neighbors to add old photos shape how Arimo’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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The story so far

Arimo, in brief

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

Arimo is a city in the Marsh Valley in central Bannock County, Idaho, United States, that is part of the Pocatello metropolitan statistical area. The population was 354 at the 2020 census.

Its first post office opened in 1912. Its population held steady between the last two censuses: 355 in 2010, 354 in 2020.

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

Timeline

Arimo, 1878 to 1968

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

  1. 19th century
  2. 1878Post officeThe Oneida post office opens
  3. 20th century
  4. 1912Post officeThe Oneida post office closes
  5. 1912Post officeThe Arimo post office opens
  6. 1968On the mapFirst mapped by the U.S. Geological Survey
By decade

Arimo, decade by decade

Today3 recent
The sun warms not only the air but also the appeal of the southeast Idaho landscape near the town of Arimo2022The sun warms not only the air but also the appeal of…The grass is not greener for the cows in this field near the town of Arimo in rugged southeast Idaho2022The grass is not greener for the cows in this field n…IDMap-doton-Arimo2004IDMap-doton-Arimo
On the map

Arimo on the map, 1968 to 1984

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

Arimo on the 1968 USGS mapArimo on the 1984 USGS map1968Arimo 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 Arimo.

People over time

Arimo, census by census

010020030019401960198020002020Peak: 355

Between 252 and 355 people in every census since 1930.

10 censuses, 1930–2020.

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

Famous people

Famous people close to Arimo

Nobody well known was born in Arimo itself, so here are the best known from just nearby.

See all →
Kayla BarronAmerican astronaut · b. 1987
Tara WestoverAmerican historian and author · b. 1986
Gloria DicksonAmerican actress · b. 1917
C
Colin JoyceAmerican bicycle racer · b. 1994
B
Billie BirdAmerican actress · b. 1908
Harold B. LeePresident of The Church of Jesus Christ of Latt… · b. 1899
Places that used to be

Lost post offices and burying grounds

Arimo’s post office has been open since 1912. Another post office, Oneida, opened and closed inside today’s town.

Oneida
1878–1912
Arimo
1912–today
18701950today
1cemetery inside Arimo
Arimo

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

Questions about Arimo’s history

What year was Arimo founded?

The Arimo post office opened in 1912, 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 (1), the Library of Congress (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.