How old are the homes in Ontwa Township, MI?

Name: Age of homes in Ontwa Township, MI, 2020–2024
Creator: US Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

58.7% (±7.8 points) of the homes in Ontwa Township, MI were built before 1980 (2020–2024 American Community Survey).

8.4% were built before 1940.

10.1% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 58.7% (±7.8 points)
Built before 1940: 8.4%
Built 2010 or later: 10.1%

When the homes in Ontwa Township were built

Housing units by year structure built, 2020–2024
Year built	Ontwa Township	Cass County	Michigan	United States
2020 or later	1.2% (±1.1 points)	1.0%	1.0%	2.0%
2010 to 2019	8.9% (±3.0 points)	6.0%	4.9%	9.4%
2000 to 2009	12.4% (±4.3 points)	12.4%	10.3%	13.6%
1990 to 1999	12.8% (±4.3 points)	11.4%	12.1%	12.4%
1980 to 1989	6.0% (±3.4 points)	8.1%	9.7%	12.9%
1970 to 1979	15.3% (±4.0 points)	15.7%	14.9%	14.2%
1960 to 1969	15.2% (±4.0 points)	11.2%	11.5%	9.9%
1950 to 1959	15.7% (±4.3 points)	11.1%	14.2%	9.5%
1940 to 1949	4.1% (±2.2 points)	6.2%	6.9%	4.4%
1939 or earlier	8.4% (±2.3 points)	17.0%	14.6%	11.7%

In Ontwa Township, the share of homes built before 1980 is not measurably different from Cass County (61.2%).

It is not measurably different from Michigan (62.1%).

It is higher than the national figure (49.7%).

In Cass County, Ontwa Township ranks 8 of 16 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 682 of 1,520.

Rankings use the estimates alone; where margins of error overlap, neighboring ranks may not truly differ.

Why the age of a home matters: lead-based paint

Federal law treats housing built before 1978 as likely to contain lead-based paint.

Before a lease or sale of most pre-1978 housing, the landlord or seller must disclose any known lead-based paint and hazards and give the tenant or buyer the EPA pamphlet (42 U.S.C. § 4852d; 40 CFR part 745, subpart F; 24 CFR part 35, subpart A).

A contractor paid to renovate, repair or paint a pre-1978 home must be a certified firm, use a certified renovator and follow lead-safe work practices under the Renovation, Repair and Painting Rule (40 CFR part 745, subpart E) whenever the job disturbs more than 6 square feet of painted surface in a room or more than 20 square feet outside; window replacement and demolition always count (40 CFR 745.83).

Certification comes from EPA, or from the state where EPA has authorized the state to run the program.

The Census Bureau groups construction by decade, so the share built before 1978 lies between the share built before 1970 (43.4%) and the share built before 1980 (58.7%).

Homes built before 1980 in places near Ontwa Township

Nearest places with a published estimate, compared with Ontwa Township
Place	Distance	Homes built before 1980	Compared with this place
Ontwa Township	—	58.7% (±7.8 points)	—
Jefferson Township (Cass County)	4.1 mi	43.9% (±10.3 points)	Lower
Simonton Lake	5.0 mi	36.4% (±8.2 points)	Lower
Cleveland Township (Elkhart County)	5.2 mi	35.4% (±7.5 points)	Lower
Harris Township	5.3 mi	19.4% (±3.5 points)	Lower
Granger	5.7 mi	33.9% (±3.6 points)	Lower
Mason Township (Cass County)	6.3 mi	43.8% (±9.9 points)	Lower
Milton Township (Cass County)	6.4 mi	48.8% (±9.5 points)	Not measurably different
Osolo Township	7.1 mi	49.2% (±4.6 points)	Lower

Nearby places with a measurably lower figure: Jefferson Township (Cass County), MI (43.9%), Simonton Lake, IN (36.4%), Cleveland Township (Elkhart County), IN (35.4%).

Distance is measured in a straight line between the Census Bureau’s internal points for each place.

Homes built before 1980 across Cass County, place by place

Rank	Place	Homes built before 1980
2	LaGrange Township	71.6% (±12.9 points)
3	Howard Township	68.8% (±10.2 points)
4	Porter Township (Cass County)	65.9% (±11.2 points)
5	Newberg Township	63.0% (±10.9 points)
6	Marcellus Township	60.5% (±10.1 points)
7	Pokagon Township	60.2% (±12.0 points)
8 (tie)	Ontwa Township	58.7% (±7.8 points)
8 (tie)	Wayne Township	58.7% (±11.4 points)
10	Silver Creek Township	57.7% (±11.0 points)
11	Penn Township	57.3% (±9.5 points)
12	Milton Township (Cass County)	48.8% (±9.5 points)
13	Volinia Township	46.9% (±10.4 points)
14	Jefferson Township (Cass County)	43.9% (±10.3 points)

Showing 13 of 16 places in Cass County, ranked from highest to lowest.

The figures for Ontwa Township include the places inside it that have pages of their own: Edwardsburg.

Survey years: 2020–2024 (American Community Survey 5-year estimates).

Margins of error are at the 90% confidence level.

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Questions about Ontwa Township

How old are most homes in Ontwa Township?

58.7% of homes in Ontwa Township, MI were built before 1980 (2020–2024 American Community Survey).

Do homes in Ontwa Township need a lead paint disclosure?

A home built before 1978 does, before it is rented or sold, unless an exemption applies (42 U.S.C. § 4852d); between 43.4% and 58.7% of homes in Ontwa Township were built before then.

Does a contractor need lead certification to work on older homes in Ontwa Township?

Yes, when the job disturbs more than 6 square feet of paint in a room or 20 square feet outside, or replaces a window: the firm must be certified and a certified renovator must direct the work under the Renovation, Repair and Painting Rule (40 CFR part 745, subpart E).

Sources

Selected Housing Characteristics (DP04), 2020–2024 ACS 5-year estimates — Ontwa township, Cass County, Michigan

To check these figures in the Census Bureau’s own API, request the variables below from the 2024 ACS 5-year data profile (acs/acs5/profile) for Ontwa township, Cass County, Michigan (county subdivision:60900, in state:26 county:027).

Each estimate (E or PE) has a margin of error beside it (M or PM).

The API needs a free key.

Request a Census API key.

DP04_0017PE, DP04_0017PM, DP04_0018PE, DP04_0018PM, DP04_0019PE, DP04_0019PM, DP04_0020PE, DP04_0020PM, DP04_0021PE, DP04_0021PM, DP04_0022PE, DP04_0022PM, DP04_0023PE, DP04_0023PM, DP04_0024PE, DP04_0024PM, DP04_0025PE, DP04_0025PM, DP04_0026PE, DP04_0026PM

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Figures are published by the US Census Bureau, HUD, the Bureau of Labor Statistics and the FBI; Seayora reproduces them and does not adjust them, except where a sentence says it compares dollar figures after inflation. They describe the whole place, not any one building or street, and are not an appraisal, a rent determination, a tax bill, a safety rating or legal advice.