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History · Twin Brooks

Twin Brooks’ post office opened in 1879, and 19% of its homes were built before 1940

Below: maps from 1973 on and the census since 1910.

1879first post office
0on the National Register
19%homes built before 1940
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Quick answers

How Twin Brooks began

When was Twin Brooks founded?

1879

The Twin Brooks post office opened in 1879, the earliest record of the town by name.

First census: 190 in 19102020 census: 47147 years
Founding year: the first Twin Brooks post office (Blevins & Helbock, CC0).

What stands out about Twin Brooks’ 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 Twin Brooks are in the public archives yet. The rest are in attics and albums.
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Start Twin Brooks’s collection

The first neighbors to add old photos shape how Twin Brooks’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

Twin Brooks, in brief

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

Twin Brooks is a town in Grant County, South Dakota, United States. The population was 47 at the 2020 census. Twin Brooks was named for two small streams near the town site; an early variant name was Two Creeks.

Its first post office opened in 1879. Between the 2010 and 2020 censuses its population fell from 69 to 47 (-32%).

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

By decade

Twin Brooks, decade by decade

Today1 recent
SDMap-doton-TwinBrooks2004SDMap-doton-TwinBrooks
On the map

Twin Brooks on the map, 1973 to 1985

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

Twin Brooks on the 1973 USGS mapTwin Brooks on the 1985 USGS map1973Twin Brooks 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 Twin Brooks.

People over time

Twin Brooks, census by census

0100200192019401960198020002020Peak: 190

Between 47 and 190 people in every census since 1910.

12 censuses, 1910–2020.

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

Questions about Twin Brooks’ history

What year was Twin Brooks founded?

The Twin Brooks post office opened in 1879, 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 (1), 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.