Spencer Brook is a township in Isanti County, Minnesota, home to about 1,952 people across 34 square miles. It has no ZIP code of its own: it’s part of 55040 and 55371.
Homes sold for a median of $200 per square foot across 2 ZIP codes in the three months ending August 2026, and all of them were seller’s markets.
Mostly Isanti City; part is in Spencer Brook
Mostly Princeton City (Mille Lacs County); part is in Spencer Brook
Each card is that ZIP code’s whole market, including any part outside Spencer Brook. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Spencer Brook’s story and what everyday life there is like, for people thinking about moving in.
Are you a local agent who knows Spencer Brook well? Agents who advertise here will be able to write the guide. Advertise on OfferBacked
| Nearest major airport | Minneapolis–Saint Paul International Airport / Wold–Chamberlain Field (MSP)49 miles away |
|---|---|
| Closer regional airport | Saint Cloud Regional Airport (STC)27 miles away |
| Nearest city of 250,000+ | Minneapolis, MN43 miles away |
| Nearest city of 1 million+ | Chicago, IL388 miles away |
Straight-line distances from the center of Spencer Brook; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Spencer Brook had 1,670 residents in the 2020 census, up 12% since 2000.
It’s the 345th largest of 2,727 towns in Minnesota by population.
Isanti County grew from 11,675 residents in 1900 to 41,135 in 2020.
Isanti County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 81°F in summer, and winter lows average 4°F. About 30.7 inches of rain and melted snow fall in a typical year, with about 49 inches of snow.
Source: NOAA 1991–2020 climate normals, Santiago 3 E, MN weather station (12 miles away).
9,859 jobs at 1,004 businesses in Isanti County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
181 doctors and other health care providers list an office in Spencer Brook’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 35 |
|---|---|
| Specialist doctors | 15 |
| Dentists | 12 |
| Nurse practitioners and physician assistants | 15 |
| Mental health providers | 59 |
| Physical and occupational therapists | 27 |
| Optometrists | 3 |
| Chiropractors | 15 |
| Pharmacies | 8 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (3 nearby)
Grocery stores (1 nearby)
Libraries (1 nearby)
Counts are within about 4 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Princeton Public School District, Cambridge-Isanti Public School Dist, Art and Science Academy. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Early Childhood Special EducationPrinceton | Pre-K | 100 | Special Education | 3.8 mi |
| Isanti Early Childhood Special EdIsanti | Pre-K | 71 | Special Education | 13.1 mi |
| Isanti Primary SchoolIsanti | Pre-K–2 | 407 | Public | 13.1 mi |
| Princeton Primary SchoolPrinceton | Pre-K–2 | 639 | Public | 4.1 mi |
| Art and Science AcademyIsanti | K–4 | 171 | Charter | 13.8 mi |
| Brookside AcademyCambridge | K–12 | 13 | Special Education | 13.7 mi |
| Cambridge-Isanti STEAM SchoolIsanti | K–5 | 139 | Public | 14.3 mi |
| Princeton Online MN K-5Princeton | K–5 | 53 | Public | 3.8 mi |
| Isanti Intermediate SchoolIsanti | 3–5 | 422 | Public | 14.3 mi |
| Princeton Intermediate SchoolPrinceton | 3–5 | 675 | Public | 4.1 mi |
| Art & Science Academy Middle SchoolIsanti | 5–8 | 125 | Charter | 13.8 mi |
| Isanti Middle SchoolIsanti | 6–8 | 449 | Public | 12.7 mi |
| M Health Fairview C&TPrinceton | 6–12 | 2 | Alternative Education | 4.0 mi |
| Princeton Middle SchoolPrinceton | 6–8 | 740 | Public | 3.7 mi |
| Princeton Online MN 6-8Princeton | 6–8 | 25 | Public | 3.8 mi |
| Riverside Academy MLPCambridge | 6–8 | 3 | Alternative Education | 13.7 mi |
| Credit RecoveryPrinceton | 9–12 | 19 | Alternative Education | 4.4 mi |
| Princeton Area Learning CenterPrinceton | 9–12 | 24 | Alternative Education | 4.4 mi |
| Princeton High SchoolPrinceton | 9–12 | 940 | Public | 3.8 mi |
| Princeton Online MNPrinceton | 9–12 | 63 | Public | 3.8 mi |
| Riverside AcademyCambridge | 9–12 | 40 | Alternative Education | 13.7 mi |
| Riverside Academy ISCambridge | 9–12 | 34 | Alternative Education | 13.7 mi |
| Moving ForwardCambridge | 12 | 23 | Special Education | 13.7 mi |
| Onward Transition ProgramPrinceton | 12 | 11 | Special Education | 3.8 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Discovery Montessori AcademyPrinceton | Pre-K–7 | 61 | Nonsectarian | 3.6 mi |
| St Scholastica Hsc AcademyIsanti | 1–12 | 40 | Roman Catholic | 12.8 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
Buying or selling around Spencer Brook? Tell us what you need and when. No agents advertise here yet, so we’ll keep your request for up to 30 days and send it to local agents who join. No obligation, and you choose who to work with.
Loading map…
Shares ZIP codes with Isanti City, Baldwin, Princeton City (Mille Lacs County), Athens, Princeton Township, Bradford, Blue Hill, Wyanett, Stanford, Greenbush Township, Isanti Township, Santiago, Bogus Brook, Princeton City (Sherburne County) and St. Francis City.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.