Township · Minnesota
Spencer Brook Township, Minnesota
Spencer Brook Township, township, in Isanti County, Minnesota. Spencer Brook Township had 1,734 residents on July 1, 2025 by the Census Bureau's estimate, up 4.0% since 2020; the 2020 Census counted 1,670 and the ACS 2020-2024 5-year estimates put it at 1,952 (±231). GEOID 2705961672.
Residents, July 2025 estimate
1,734
Census Bureau estimate (no margin published)
2020 Census count: 1,670 · ACS 2020-2024: 1,952 ±231
Median household income
$103,818
±$3,805 (90% margin)
Minnesota: $89,062
Median home value
$338,300
±$19,759 (90% margin)
Minnesota: $329,300
Median gross rent
not published
Minnesota: $1,280
Where is Spencer Brook Township and what county is it in?
Spencer Brook Township is a township in Isanti County, Minnesota. It covers 33.7 square miles of land, 50 residents per square mile in 2020.
Spencer Brook Township is in the Minneapolis-St. Paul-Bloomington, MN-WI metropolitan statistical area, which takes in 15 counties (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Spencer Brook Township, and is it growing?
The Census Bureau estimates that 1,734 people lived in Spencer Brook Township on July 1, 2025, up 4.0% since 2020, faster than Minnesota (+2.2%). The 2020 Census counted 1,670 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 1,952 (±231).
| Measure | Spencer Brook Township | Isanti County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 1,952±231 | 42,596 | +310 |
| Households | 639±80 | 16,293 | no clear change |
| Average household size | 3.05±0.27 | 2.59 | no clear change |
| Housing units | 734±93 | 17,268 | no clear change |
Spencer Brook Township's population since 2000
From 1,495 in 2000 to 1,734 in 2025: up 16.0%. The 2000, 2010 and 2020 figures are census counts, each for Spencer Brook Township as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Spencer Brook Township?
The median resident of Spencer Brook Township is 39.8 years old; 30.5% are under 18 and 15.0% are 65 or older. The largest group is non-Hispanic white residents at 92.3%, then Hispanic or Latino residents (of any race) at 3.8%.
| Measure | Spencer Brook Township | Isanti County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 39.8±2.9 | 40.2 | no clear change |
| Under 18 years | 30.5%±4.3 pts | 23.2% | – |
| 65 years and over | 15.0%±3.6 pts | 17.2% | – |
| Male | 52.0%±3.0 pts | 50.6% | – |
| Hispanic or Latino (any race) | 3.8%±2.6 pts | 2.6% | – |
| White alone, not Hispanic | 92.3%±4.1 pts | 90.8% | no clear change |
| Black or African American alone, not Hispanic | 0.0%±1.1 pts | 0.9% | – |
| Asian alone, not Hispanic | 0.0%±1.1 pts | 1.9% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.2%±0.2 pts | 0.4% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±1.1 pts | 0.0% | – |
| Two or more races, not Hispanic | 3.7%±3.2 pts | 3.3% | – |
| Some other race alone, not Hispanic | 0.0%±1.1 pts | 0.2% | – |
| Born outside the United States | 2.6%±2.2 pts | 2.4% | – |
| Speak a language other than English at home (age 5+) | 4.0%±2.9 pts | 2.9% | – |
| Civilian veterans (age 18+) | 6.6%±2.5 pts | 8.1% | – |
| With a disability | 10.3%±2.9 pts | 12.6% | – |
| No health insurance coverage | 7.7%±3.3 pts | 4.5% | +5.6 pts |
| High school graduate or higher (age 25+) | 94.5%±2.5 pts | 93.2% | – |
| Bachelor's degree or higher (age 25+) | 17.2%±3.4 pts | 20.7% | no clear change |
| Graduate or professional degree (age 25+) | 5.6%±2.1 pts | 5.4% | – |
| Lived in the same house a year earlier | 92.5%±3.7 pts | 89.8% | – |
| Moved from another state in the past year | 0.3%±0.4 pts | 0.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Spencer Brook Township earn?
Half of Spencer Brook Township's 639 households earn less than $103,818 a year (±$3,805), against $87,440 in Isanti County and $89,062 in Minnesota. In 2015-2019 it was $101,312 in 2024 dollars; the margins of error cannot tell the two periods apart. 5.6% of residents live below the poverty line.
| Measure | Spencer Brook Township | Isanti County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $103,818±$3,805 | $87,440 | no clear change |
| Mean household income | $120,129±$11,026 | $101,012 | – |
| Per capita income | $40,941±$4,028 | $39,737 | no clear change |
| People below the poverty line | 5.6%±2.5 pts | 7.5% | no clear change |
| Children under 18 below the poverty line | 6.1%±4.2 pts | 8.1% | – |
| Households receiving SNAP | 4.4%±2.8 pts | 6.7% | – |
| Households with a computer | 95.9%±2.6 pts | 95.5% | – |
| Households with a broadband subscription | 90.9%±3.5 pts | 90.7% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Spencer Brook Township?
Owners occupy 97.7% of Spencer Brook Township's occupied homes and renters 2.3%. The median owner-occupied home is valued at $338,300 by its owner (±$19,759).
| Measure | Spencer Brook Township | Isanti County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $338,300±$19,759 | $306,200 | no clear change |
| Renters paying 35% or more of income on rent | 69.2%±42.0 pts | 41.5% | – |
| Median monthly owner costs, with a mortgage | $2,000±$216 | $1,850 | – |
| Owner-occupied homes | 97.7%±1.9 pts | 83.7% | no clear change |
| Renter-occupied homes | 2.3%±1.9 pts | 16.3% | – |
| Housing units | 734±93 | 17,268 | no clear change |
| Homeowner vacancy rate | 0.0%±3.4 pts | 1.0% | – |
| Rental vacancy rate | 0.0%±63.7 pts | 0.3% | – |
| Single-family detached homes | 98.8%±1.4 pts | 82.4% | – |
| Mobile homes | 1.2%±1.4 pts | 2.5% | – |
| Built 2020 or later | 1.2%±1.2 pts | 2.9% | – |
| Built 2010 to 2019 | 3.3%±1.7 pts | 10.1% | – |
| Built 1939 or earlier | 12.5%±4.0 pts | 10.4% | – |
| Households with no vehicle | 0.5%±0.8 pts | 3.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Spencer Brook Township work and get to work?
79.2% of Spencer Brook Township's workers drive alone and 9.4% work from home. The average trip to work takes 34.3 minutes.
| Measure | Spencer Brook Township | Isanti County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 69.8%±5.2 pts | 67.1% | – |
| Unemployment rate | 1.5%±1.3 pts | 4.1% | – |
| Drove alone to work | 79.2%±5.1 pts | 76.4% | – |
| Carpooled | 9.6%±4.4 pts | 7.4% | – |
| Public transportation | 0.0%±2.2 pts | 0.7% | – |
| Walked | 0.9%±1.0 pts | 1.9% | – |
| Worked from home | 9.4%±3.5 pts | 12.2% | no clear change |
| Mean travel time to work | 34.3 min±2.6 | 30.7 min | −5.7 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Spencer Brook Township?
No census tract lies mostly in Spencer Brook Township; 1 tract reaches into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 1306Isanti County | 4,177 | $102,528 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Spencer Brook Township) · Census block assignment files
How does Spencer Brook Township compare with other places in Minnesota?
By the Census Bureau's July 2025 estimates, Spencer Brook Township is the 5,422nd-most populous of the 16,079 U.S. towns and townships that have one and the 94th-most populous of 1,772 in Minnesota.
Spencer Brook Township ranks 178th of 558 places in Minnesota with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 94th | 1,772 |
| Growth 2020-2025 (PEP) | 146th | 556 |
| Residents per square mile | 463rd | 562 |
| Median household income | 178th | 558 |
| Per capita income | 322nd | 562 |
| Median home value | 235th | 559 |
| Poverty rate | 316th | 461 |
| Bachelor's degree or higher | 508th | 559 |
| Median age | 345th | 561 |
| Owner-occupied share | 27th | 561 |
| Work from home | 369th | 525 |
| Travel time to work | 26th | 562 |
Spencer Brook Township's figures with every place in Minnesota (CSV)
Every place in Minnesota, sortable · Compare Spencer Brook Township with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Spencer Brook Township?
20 of the 56 figures for Spencer Brook Township on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Spencer Brook Township are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.