Grass Lake is a charter township in Jackson County, Michigan, home to about 6,177 people across 46 square miles. Its ZIP code is 49240.
Homes sold for a median of $193 per square foot in the three months ending August 2026, a seller’s market.
Mostly Grass Lake; also Leoni and Waterloo
Each card is that ZIP code’s whole market, including any part outside Grass Lake. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Grass Lake’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Detroit Metropolitan Wayne County Airport (DTW)43 miles away |
|---|---|
| Nearest city of 250,000+ | Toledo, OH52 miles away |
| Nearest city of 1 million+ | Chicago, IL181 miles away |
Straight-line distances from the center of Grass Lake; 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.
Grass Lake had 6,069 residents in the 2020 census, up 32% since 2000.
It’s the 305th largest of 1,531 towns in Michigan by population.
Jackson County grew from 48,222 residents in 1900 to 160,366 in 2020.
Jackson County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 82°F in summer, and winter lows average 16°F. About 34.6 inches of rain and melted snow fall in a typical year, with about 33 inches of snow.
Source: NOAA 1991–2020 climate normals, Chelsea, MI weather station (10 miles away).
50,612 jobs at 2,991 businesses in Jackson County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
27 doctors and other health care providers list an office in Grass Lake.
Nearest hospitals
Providers with an office here
| Primary care doctors | 6 |
|---|---|
| Specialist doctors | 1 |
| Dentists | 2 |
| Nurse practitioners and physician assistants | 5 |
| Mental health providers | 6 |
| Physical and occupational therapists | 4 |
| Chiropractors | 3 |
| Pharmacies | 5 |
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 (6 nearby)
Grocery stores (1 nearby)
Pharmacies
Libraries (1 nearby)
Museums (3 nearby)
Theaters and performance venues
Counts are within about 4.5 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 Grass Lake Community Schools. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| George Long Elementary SchoolGrass Lake | K–5 | 650 | Public | 1.6 mi |
| Grass Lake Middle SchoolGrass Lake | 6–8 | 290 | Public | 1.5 mi |
| Grass Lake High SchoolGrass Lake | 9–12 | 394 | Public | 2.0 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Leoni, Waterloo, Sharon, Norvell, Sylvan Township (Washtenaw County) and Napoleon.
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.