How old are the homes in the Town of Johnstown (Rock County), WI?

Name: Age of homes in the Town of Johnstown (Rock County), WI, 2020–2024
Creator: US Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

79.1% (±12.7 points) of the homes in the Town of Johnstown (Rock County), WI were built before 1980 (2020–2024 American Community Survey).

41.0% were built before 1940.

2.6% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 79.1% (±12.7 points)
Built before 1940: 41.0%
Built 2010 or later: 2.6%

When the homes in the Town of Johnstown (Rock County) were built

Housing units by year structure built, 2020–2024
Year built	Town of Johnstown (Rock County)	Rock County	Wisconsin	United States
2020 or later	0.0% (±7.1 points)	1.2%	1.4%	2.0%
2010 to 2019	2.6% (±1.9 points)	4.3%	7.1%	9.4%
2000 to 2009	5.6% (±2.8 points)	10.8%	12.5%	13.6%
1990 to 1999	4.3% (±2.9 points)	10.8%	12.5%	12.4%
1980 to 1989	8.5% (±4.1 points)	8.0%	9.5%	12.9%
1970 to 1979	23.0% (±6.6 points)	14.4%	14.2%	14.2%
1960 to 1969	3.6% (±3.1 points)	13.4%	9.4%	9.9%
1950 to 1959	4.9% (±4.5 points)	10.7%	10.3%	9.5%
1940 to 1949	6.6% (±4.9 points)	7.2%	5.3%	4.4%
1939 or earlier	41.0% (±8.0 points)	19.2%	17.8%	11.7%

In the Town of Johnstown (Rock County), the share of homes built before 1980 is higher than in Rock County (64.9%).

It is also higher than in Wisconsin (57.0%).

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

In Rock County, the Town of Johnstown (Rock County) ranks 5 of 28 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 93 of 1,848.

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 (56.1%) and the share built before 1980 (79.1%).

Homes built before 1980 in places near the Town of Johnstown (Rock County)

Nearest places with a published estimate, compared with the Town of Johnstown (Rock County)
Place	Distance	Homes built before 1980	Compared with this place
Town of Johnstown (Rock County)	—	79.1% (±12.7 points)	—
Town of Harmony (Rock County)	5.5 mi	46.0% (±11.1 points)	Lower
Town of Lima (Rock County)	5.6 mi	67.3% (±15.8 points)	Not measurably different
Town of Richmond (Walworth County)	6.4 mi	58.2% (±10.7 points)	Lower
Town of Whitewater	6.6 mi	59.6% (±10.8 points)	Lower
Town of Bradford	6.6 mi	66.6% (±15.5 points)	Not measurably different
Milton	6.7 mi	56.9% (±10.4 points)	Lower
Town of La Prairie	8.3 mi	82.2% (±14.7 points)	Not measurably different
Town of Darien	8.7 mi	56.5% (±13.4 points)	Lower

Nearby places with a measurably lower figure: Town of Harmony (Rock County), WI (46.0%), Town of Richmond (Walworth County), WI (58.2%), Town of Whitewater, WI (59.6%).

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

Homes built before 1980 across Rock County, place by place

Rank	Place	Homes built before 1980
1	Footville	86.0% (±17.0 points)
2 (tie)	Town of La Prairie	82.2% (±14.7 points)
2 (tie)	Town of Turtle	82.2% (±14.5 points)
4	Town of Avon	81.3% (±19.6 points)
5	Town of Johnstown (Rock County)	79.1% (±12.7 points)
6	Town of Spring Valley	78.8% (±14.2 points)
7	Beloit	77.8% (±5.1 points)
8	Orfordville	71.3% (±19.0 points)
9	Town of Newark	70.8% (±11.3 points)
10	Town of Clinton (Rock County)	70.5% (±20.6 points)
11	Town of Plymouth (Rock County)	69.5% (±11.8 points)

Showing 11 of 28 places in Rock 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.

What you can do on Seayora in Town of Johnstown (Rock County)

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Questions about Town of Johnstown (Rock County)

How old are most homes in the Town of Johnstown (Rock County)?

79.1% of homes in the Town of Johnstown (Rock County), WI were built before 1980 (2020–2024 American Community Survey).

Do homes in the Town of Johnstown (Rock County) 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 56.1% and 79.1% of homes in the Town of Johnstown (Rock County) were built before then.

Does a contractor need lead certification to work on older homes in the Town of Johnstown (Rock County)?

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 — Johnstown town, Rock County, Wisconsin

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 Johnstown town, Rock County, Wisconsin (county subdivision:38450, in state:55 county:105).

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.