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History · Diamondville

Diamondville’s post office opened in 1895, and 25% of its homes were built before 1940

Below: 2 old photos and papers, maps from 1907 on, and the census since 1910.

1895first post office
0on the National Register
25%homes built before 1940
2old photos & papers
Add an old photoShare a memory
From Diamondville’s archive · credits on each photo
Quick answers

How Diamondville began

When was Diamondville founded?

1895

The Diamondville post office opened in 1895, the earliest record of the town by name.

First census: 696 in 19102020 census: 520131 years
Founding year: the first Diamondville post office (Blevins & Helbock, CC0).The full story ↓

What stands out about Diamondville’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 2 old photos are in the public archives. The rest are in attics and albums.Boom and bustPeaked at 1,000 in 1980; 520 people lived here in 2020.Mapped building by building4 fire insurance maps, 1907 to 1930, drew every building in Diamondville.
★ What stands out · Help out

Start Diamondville’s collection

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

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
1 of 10 decades. The empty ones are waiting for someone’s album.
Retake an old viewDiamondville Coal Mine, Wyoming: stand where they stood+15Share a family photoSign in to add one+10
People over time

Diamondville, census by census

02004006008001,000192019401960198020002020Peak: 1,000

Peaked at 1,000 in 1980; 520 people lived here in 2020.

12 censuses, 1910–2020.

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

Every building

Diamondville, building by building, 1907–1930

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.

Diamondville fire insurance map, 1907, sheet 31907Sheet 3 of 3
Edition
BrickWoodStone

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

The story

How Diamondville came to be

From Wikipedia’s history of Diamondville.

Read it all →

Harrison Church discovered coal near the Hams Fork River in 1868. He gathered financial backing from a group in Minneapolis, and they formed the Hams Fork River Coal Company. Diamondville was built to house the miners. The management of the coal company came to S.F. Fields in Salt Lake City. He sought backing from the Anaconda Mining Company and renamed it Diamond Coal and Coke Company.

Many of the workers came from Almy, Wyoming where the mines had several explosions. The miners mainly lived in a "shack town" as no houses were built.

The town was named for the superior-grade coal that came from the local mines. The coal resembled black diamonds.

ChaptersMine

Text from Wikipedia, licensed CC BY-SA 4.0.

Timeline

Diamondville, 1895 to 1980

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

  1. 19th century
  2. 1895Post officeThe Diamondville post office opens
  3. 20th century
  4. 1903In the archiveDiamondville Coal Mine, Wyoming
  5. 1954On the mapFirst mapped by the U.S. Geological Survey
  6. 1980CensusPopulation peaks at 1,000
By decade

Diamondville, decade by decade

One decade in the archive so far: the 1900s. Scroll each row; tap a photo for its story.

1900s2 items
Diamondville Coal Mine, Wyoming1903Diamondville Coal Mine, WyomingDiamondville, Wyoming1903Diamondville, Wyoming
1910s–1990snothing yet
Nothing in the archives for these yearsWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
Add from your album
On the map

Diamondville on the map, 1954 to 1985

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

Diamondville on the 1954 USGS mapDiamondville on the 1985 USGS map1954Kemmerer 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 Diamondville.

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.

Diamondville Coal Mine, Wyoming
Retake this viewDiamondville Coal Mine, Wyoming, 1903

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

Retake this view · +15
Famous people

Famous people close to Diamondville

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

See all →
David M. KennedyAmerican diplomat · b. 1905
Edgar HerschlerAmerican politician · b. 1918
John BuckAmerican baseball player, 2004-2014 major leagu… · b. 1980
Merrill BradshawAmerican composer · b. 1929
Places that used to be

Places now gone and burying grounds

Diamondville’s post office has been open since 1895.

Gone or out of use
Diamondville Number 1 Minemine
1cemetery inside Diamondville
South Lincoln

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.

Kemmerer4 historic placesB

Questions about Diamondville’s history

What year was Diamondville founded?

The Diamondville post office opened in 1895, 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), Wikipedia, 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.