Ontwa is a township in Cass County, Michigan, home to about 6,870 people across 19 square miles. Its ZIP code is 49112.
Homes sold for a median of $182 per square foot in the three months ending August 2026, a seller’s market.
Mostly Ontwa; also Mason Township (Cass County) and Jefferson Township (Cass County)
Each card is that ZIP code’s whole market, including any part outside Ontwa. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Ontwa’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Gerald R. Ford International Airport (GRR)79 miles away |
|---|---|
| Closer regional airport | South Bend International Airport (SBN)16 miles away |
| Nearest city of 250,000+ | Fort Wayne, IN67 miles away |
| Nearest city of 1 million+ | Chicago, IL85 miles away |
Straight-line distances from the center of Ontwa; 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.
Ontwa had 6,904 residents in the 2020 census, up 18% since 2000.
It’s the 280th largest of 1,531 towns in Michigan by population.
Cass County grew from 20,876 residents in 1900 to 51,589 in 2020.
Cass County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 83°F in summer, and winter lows average 19°F. About 41.5 inches of rain and melted snow fall in a typical year, with about 63 inches of snow.
Source: NOAA 1991–2020 climate normals, Niles, MI weather station (13 miles away).
7,632 jobs at 777 businesses in Cass County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
17 doctors and other health care providers list an office in Ontwa.
Nearest hospitals
Providers with an office here
| Primary care doctors | 3 |
|---|---|
| Specialist doctors | 1 |
| Nurse practitioners and physician assistants | 2 |
| Mental health providers | 3 |
| Physical and occupational therapists | 4 |
| Optometrists | 1 |
| Chiropractors | 3 |
| Pharmacies | 1 |
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.
Grocery stores
Pharmacies
Libraries
Museums
Counts are within about 3 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 Edwardsburg Public Schools. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Edwardsburg Primary SchoolEdwardsburg | K–1 | 342 | Public | 3.3 mi |
| Eagle Lake Elementary SchoolEdwardsburg | 2–3 | 385 | Public | 0.3 mi |
| Edwardsburg Intermediate SchoolEdwardsburg | 4–5 | 361 | Public | 3.4 mi |
| Edwardsburg Middle SchoolEdwardsburg | 6–8 | 612 | Public | 3.3 mi |
| Edwardsburg Alternative Learning CenterEdwardsburg | 9–12 | 46 | Alternative Education | 3.2 mi |
| Edwardsburg High SchoolEdwardsburg | 9–12 | 773 | Public | 3.3 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 Mason Township (Cass County), Jefferson Township (Cass County) and Howard.
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.