How Spencer Brook Township began, and where its name came from
When was Spencer Brook Township founded?
1857
The Spencer Brook Township post office opened in 1857, the earliest record of the town by name. Another post office, Spencer Brook (1857), opened inside today’s town and later closed.
2020 census: 1,670169 years
How did Spencer Brook Township get its name?
Spencer Brook Township was named after Benjamin Nicholson Spencer (1806-1881) who came from Turkeyfoot, PA and...
How historic is Spencer Brook Township?
B
More historic than 55% of U.S. towns, on its age, its old homes and the National Register.
Founding year: the first Spencer Brook Township post office (Blevins & Helbock, CC0). Name: Wikipedia, licensed CC BY-SA 4.0.
History grade
What drives Spencer Brook Township’s History grade
On its age, its old homes and the National Register, Spencer Brook Township is more historic than 55% of U.S. towns. Its National Register listings hold the grade up; its age pulls it down.
B
HistoryA character grade: shown, never part of Spencer Brook Township’s overall grade.
Minnesota towns list about as much on the Register as the country (a typical Minnesota town has 2.1 per 10,000 residents, the U.S. 2.4), so Spencer Brook Township’s 10.2 sits above most of its state (76% of Minnesota towns have fewer) while its 2 historic buildings outnumber those of 60% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from C+ to B+. The pre-1940 share is a Census survey estimate (±3.9 points). The founding year is the first post office, not a stated founding date.
Founding year: the first post office (other dates in Quick answers). Homes: Census ACS 2020–24. National Register: National Park Service, May 2026 list; each listing counted once (boundary changes and added documentation belong to their listing), and a historic district counts its contributing buildings. How TownRatings grades history →
What stands out about Spencer Brook Township’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Wikipedia doesn’t have a history of Spencer Brook Township yet. The photos, dates and memories neighbors add here are how it gets written.
Spencer Brook is an unincorporated community in Spencer Brook Township, Isanti County, Minnesota, United States. Isanti County Roads 7 and 40 are two of the main routes in the community. Spencer Brook is located between Bradford and Princeton. The Rum River and Spencer Brook both flow through the community. Spencer Brook was one of the first communities in Isanti County, settled in the late 1850s by Yankees from the east coast, many Civil War veterans. Spencer Brook includes the historic country school and Able Hearts Community and Christian Counseling formerly Spencer Brook United Methodist Church. It was named after Benjamin Nicholson Spencer (1806-1881) who came from Turkeyfoot, PA and...
Its first post office opened in 1857. Between the 2010 and 2020 censuses its population grew from 1,589 to 1,670 (+5%).
Intro from Wikipedia. Population: U.S. Census Bureau.
Timeline
Spencer Brook Township, 1857 to 1961
Woven from the archive, old maps, post office records, the National Register and the people born here.
The U.S. Geological Survey’s map of Spencer Brook Township.
1961Wyanett 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 Spencer Brook Township.
On the National Register
1 historic place in Spencer Brook Township
The country’s official list of buildings and places worth saving.
The Spencer Brook Township post office opened in 1857, the earliest record of the town by name (U.S. post office records).
How does Spencer Brook Township rank for history?
Spencer Brook Township is more historic than 55% of U.S. towns. The History grade combines the town’s founding era, the share of homes built before 1940 and its National Register listings. It’s a character grade, so it isn’t part of the overall grade. How it works.
What is on the National Register in Spencer Brook Township?
One place: the District No. 1 School (listed 1980).
How old are the homes in Spencer Brook Township?
13% of Spencer Brook Township’s homes were built before 1940 (Census estimate, ±3.9 points), against a typical 8.1% for a Minnesota town; the median home was built in 1978.
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).
From the National Register of Historic Places (1), U.S. Geological Survey historical maps, 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.
