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History · Flensburg

Flensburg’s post office opened in 1892, and 22% of its homes were built before 1940

Below: maps from 1947 on and the census since 1920.

1892first post office
0on the National Register
22%homes built before 1940
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Photo: Andrew Filer · CC BY-SA 2.0
Quick answers

How Flensburg began

When was Flensburg founded?

1892

The Flensburg post office opened in 1892, the earliest record of the town by name.

First census: 210 in 19202020 census: 216134 years
Founding year: the first Flensburg post office (Blevins & Helbock, CC0).The full story ↓

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

Start Flensburg’s collection

The first neighbors to add old photos shape how Flensburg’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

How Flensburg came to be

From Wikipedia’s history of Flensburg.

Read it all →

After the Little Falls and Dakota Railroad was completed in 1882, there was a sidetrack to a mill at the site which later became Flensburg Village. The mill was called "Flen's Landing" or "Flynn's Siding", with a depot, and named for J. C. Flynn of Little Falls. Flynn was a teacher in the Little Falls schools in the late 1870s. Later, Flynn was an inspector for the Northern Pacific Railroad and a representative in the state legislature. He was also instrumental in developing the Little Falls & Dakota (L.F.& D.) railroad which ran through the future town of Flensburg.

Text from Wikipedia, licensed CC BY-SA 4.0.

By decade

Flensburg, decade by decade

Today6 recent
Flensburg, Minnesota2006Flensburg, MinnesotaFlensburg, Minnesota2006Flensburg, MinnesotaFlensburg, Minnesota2006Flensburg, MinnesotaFlensburg, Minnesota2006Flensburg, MinnesotaFlensburg, Minnesota2006Flensburg, MinnesotaMNMap-doton-Flensburg2005MNMap-doton-Flensburg
On the map

Flensburg on the map, 1947 to 1978

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

Flensburg on the 1947 USGS mapFlensburg on the 1951 USGS mapFlensburg on the 1978 USGS map1947Flensburg sheet · 1:25,000

U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Flensburg.

People over time

Flensburg, census by census

0100200300192019401960198020002020Peak: 284

Between 210 and 284 people in every census since 1920.

11 censuses, 1920–2020.

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

Places that used to be

Places now gone and burying grounds

Flensburg’s post office has been open since 1892.

Gone or out of use
Flensburglocale
2cemeteries and burying grounds inside Flensburg
Sacred HeartSacred Heart Cemetery East

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.

Culdrum TownshipIts storynot graded: under 1,000 residents or part of its townPike Creek Township1 historic placenot graded: under 1,000 residents or part of its town

Questions about Flensburg’s history

What year was Flensburg founded?

The Flensburg post office opened in 1892, 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 (6), Wikipedia, 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.