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Brockton Montana PanoramaPhoto: I, the copyright holder of this work, hereby publish it under the following license: · CC BY-SA 3.0
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History · Brockton

Brockton’s post office opened in 1904

Most of Brockton was built recently: 6% of its homes predate 1940 and the median home dates from 1981.

1904first post office
0on the National Register
6%homes built before 1940
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Photo: I, the copyright holder of this work, hereby publish it under the following license: · CC BY-SA 3.0
Quick answers

How Brockton began

When was Brockton founded?

1904

The Brockton post office opened in 1904, the earliest record of the town by name.

2020 census: 358122 years
Founding year: the first Brockton post office (Blevins & Helbock, CC0).

What stands out about Brockton’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 Brockton are in the public archives yet. The rest are in attics and albums.
★ What stands out · Help out

Start Brockton’s collection

The first neighbors to add old photos shape how Brockton’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

Brockton, in brief

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

Brockton is a census-designated place and former town in Roosevelt County, Montana, United States. The population was 358 at the 2020 census. Brockton's first post office was established in 1904. Fort Peck Indian Reservation was opened to non-Native settlers in 1913 and the town boomed. It was incorporated in 1952, and was disincorporated on January 23, 2018.

Its first post office opened in 1904. Between the 2010 and 2020 censuses its population grew from 255 to 358 (+40%).

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

By decade

Brockton, decade by decade

Today3 recent
Brockton Montana Panorama2013Brockton Montana PanoramaI don't know what they are harvesting here but it doesn't look good2010I don't know what they are harvesting here but it doe…MTMap-doton-Brockton2005MTMap-doton-Brockton
Places that used to be

Places now gone

Brockton’s post office has been open since 1904.

Gone or out of use
Occident ElevatorlocaleTreasure State Elevatorlocale

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

Questions about Brockton’s history

What year was Brockton founded?

The Brockton post office opened in 1904, 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 →
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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.