How old are the homes in Mason City Township, IL?

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

86.2% (±11.8 points) of the homes in Mason City Township, IL were built before 1980 (2020–2024 American Community Survey).

45.8% were built before 1940.

1.2% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 86.2% (±11.8 points)
Built before 1940: 45.8%
Built 2010 or later: 1.2%

When the homes in Mason City Township were built

Housing units by year structure built, 2020–2024
Year built	Mason City Township	Mason County	Illinois	United States
2020 or later	0.0% (±3.0 points)	0.3%	0.7%	2.0%
2010 to 2019	1.2% (±2.1 points)	2.6%	5.0%	9.4%
2000 to 2009	2.0% (±2.0 points)	4.5%	11.2%	13.6%
1990 to 1999	6.7% (±4.7 points)	6.1%	10.5%	12.4%
1980 to 1989	3.9% (±2.3 points)	4.6%	9.2%	12.9%
1970 to 1979	10.5% (±3.6 points)	19.9%	14.2%	14.2%
1960 to 1969	11.3% (±4.5 points)	11.2%	11.5%	9.9%
1950 to 1959	14.8% (±5.6 points)	14.9%	11.9%	9.5%
1940 to 1949	3.8% (±2.6 points)	6.8%	5.6%	4.4%
1939 or earlier	45.8% (±8.3 points)	29.1%	20.2%	11.7%

In Mason City Township, the share of homes built before 1980 is not measurably different from Mason County (81.9%).

It is also higher than in Illinois (63.4%).

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

In Mason County, Mason City Township ranks 10 of 22 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 374 of 2,751.

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 (75.7%) and the share built before 1980 (86.2%).

Homes built before 1980 in places near Mason City Township

Nearest places with a published estimate, compared with Mason City Township
Place	Distance	Homes built before 1980	Compared with this place
Mason City Township	—	86.2% (±11.8 points)	—
Mason City	2.2 mi	87.5% (±12.5 points)	Not measurably different
New Holland	4.1 mi	93.3% (±23.0 points)	Not measurably different
Salt Creek Township	5.9 mi	53.5% (±38.5 points)	Not measurably different
Sheridan Township	6.2 mi	93.7% (±16.9 points)	Not measurably different
Allens Grove Township	6.7 mi	90.6% (±20.2 points)	Not measurably different
Middletown	7.0 mi	85.2% (±21.8 points)	Not measurably different
Pennsylvania Township	7.8 mi	91.9% (±56.2 points)	Not measurably different
Greenview	8.2 mi	80.0% (±16.3 points)	Not measurably different

None of the nearby places differs measurably from this one on this figure.

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

Homes built before 1980 across Mason County, place by place

Rank	Place	Homes built before 1980
4	Easton	90.3% (±22.6 points)
5	Sherman Township	90.2% (±19.5 points)
6	Lynchburg Township	89.5% (±43.4 points)
7	Havana	88.6% (±15.8 points)
8	Forest City	88.3% (±26.4 points)
9	Mason City	87.5% (±12.5 points)
10	Mason City Township	86.2% (±11.8 points)
11	Havana Township	84.5% (±12.0 points)
12	Manito	80.7% (±11.9 points)
13	Kilbourne Township	78.2% (±20.8 points)
14	Kilbourne	77.6% (±22.6 points)
15	Forest City Township	77.0% (±27.2 points)
16	Manito Township	76.8% (±10.5 points)

Showing 13 of 22 places in Mason County, ranked from highest to lowest.

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 Mason City Township

How old are most homes in Mason City Township?

86.2% of homes in Mason City Township, IL were built before 1980 (2020–2024 American Community Survey).

Do homes in Mason City 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 75.7% and 86.2% of homes in Mason City Township were built before then.

Does a contractor need lead certification to work on older homes in Mason City 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 — Mason City township, Mason County, Illinois

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 Mason City township, Mason County, Illinois (county subdivision:47482, in state:17 county:125).

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.