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History · Calio

Calio’s post office opened in 1905, and 11% of its homes were built before 1940

Below: maps from 1971 on and the census since 1920.

1905first post office
0on the National Register
11%homes built before 1940
1famous people
Add an old photoShare a memory
Photo: Andrew Filer from Seattle (ex-Minneapolis) · CC BY-SA 2.0
Quick answers

How Calio began

When was Calio founded?

1905

The Calio post office opened in 1905, the earliest record of the town by name. Another post office, Etna (1902), opened inside today’s city and later closed.

First census: 132 in 19202020 census: 8121 years
Founding year: the first Calio post office (Blevins & Helbock, CC0).

What stands out about Calio’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 Calio are in the public archives yet. The rest are in attics and albums.Boom and bustPeaked at 152 in 1930; 8 people lived here in 2020.
★ What stands out · Help out

Start Calio’s collection

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

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
0 of 10 decades. The empty ones are waiting for someone’s album.
Share a family photoSign in to add one+10
People over time

Calio, census by census

0100192019401960198020002020Peak: 152

Peaked at 152 in 1930; 8 people lived here in 2020.

11 censuses, 1920–2020.

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

The story so far

Calio, in brief

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

Calio is a city in Cavalier County, North Dakota, United States. The population was 8 at the 2020 census. Calio was founded in 1905.

Its first post office opened in 1905. Between the 2010 and 2020 censuses its population fell from 22 to 8 (-64%).

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

Timeline

Calio, 1902 to 1989

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

  1. 20th century
  2. 1902Post officeThe Etna post office opens
  3. 1905Post officeThe Etna post office closes
  4. 1905Post officeThe Calio post office opens
  5. 1911Born hereEldon Bernard Schuster is born here
  6. 1930CensusPopulation peaks at 152
  7. 1971On the mapFirst mapped by the U.S. Geological Survey
  8. 1989Post officeThe Calio post office closes
By decade

Calio, decade by decade

Today10 recent
Calio, North Dakota2009Calio, North DakotaCalio, North Dakota 7-19-20092009Calio, North Dakota 7-19-2009Calio, North Dakota2009Calio, North DakotaCalio, North Dakota2009Calio, North DakotaCalio, North Dakota2009Calio, North DakotaCalio, North Dakota2009Calio, North DakotaCalio, North Dakota2009Calio, North DakotaCalio, North Dakota2009Calio, North DakotaCalio, North Dakota2009Calio, North DakotaCalio, North Dakota2009Calio, North Dakota
On the map

Calio on the map, 1971 to 1985

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

Calio on the 1971 USGS mapCalio on the 1985 USGS map1971Calio 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 Calio.

Places that used to be

Lost post offices

Calio had its own post office from 1905 to 1989. Another post office, Etna, opened and closed inside today’s town.

Etna
1902–1905
Calio
1905–1989
19001960today

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

Stories next door

History across the town line

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

Seivert TownshipIts storynot graded: under 1,000 residents or part of its townTrier TownshipIts storynot graded: under 1,000 residents or part of its town

Questions about Calio’s history

What year was Calio founded?

The Calio post office opened in 1905, 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 (10), 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) 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.