How old are the homes in the Town of Koshkonong, WI?

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

52.9% (±10.2 points) of the homes in the Town of Koshkonong, WI were built before 1980 (2020–2024 American Community Survey).

11.5% were built before 1940.

10.2% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 52.9% (±10.2 points)
Built before 1940: 11.5%
Built 2010 or later: 10.2%

When the homes in the Town of Koshkonong were built

Housing units by year structure built, 2020–2024
Year built	Town of Koshkonong	Jefferson County	Wisconsin	United States
2020 or later	0.8% (±1.2 points)	1.1%	1.4%	2.0%
2010 to 2019	9.4% (±4.1 points)	5.4%	7.1%	9.4%
2000 to 2009	14.1% (±4.6 points)	13.5%	12.5%	13.6%
1990 to 1999	15.6% (±3.9 points)	13.8%	12.5%	12.4%
1980 to 1989	7.3% (±3.7 points)	7.4%	9.5%	12.9%
1970 to 1979	19.5% (±6.3 points)	13.3%	14.2%	14.2%
1960 to 1969	6.6% (±3.3 points)	7.6%	9.4%	9.9%
1950 to 1959	8.9% (±4.8 points)	9.9%	10.3%	9.5%
1940 to 1949	6.4% (±3.6 points)	3.9%	5.3%	4.4%
1939 or earlier	11.5% (±4.2 points)	24.3%	17.8%	11.7%

In the Town of Koshkonong, the share of homes built before 1980 is not measurably different from Jefferson County (59.0%).

It is not measurably different from Wisconsin (57.0%).

It is not measurably different from the national figure (49.7%).

In Jefferson County, the Town of Koshkonong ranks 17 of 24 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 972 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 (33.4%) and the share built before 1980 (52.9%).

Homes built before 1980 in places near the Town of Koshkonong

Nearest places with a published estimate, compared with the Town of Koshkonong
Place	Distance	Homes built before 1980	Compared with this place
Town of Koshkonong	—	52.9% (±10.2 points)	—
Fort Atkinson	2.1 mi	69.0% (±7.5 points)	Higher
Town of Jefferson (Jefferson County)	6.0 mi	55.0% (±13.7 points)	Not measurably different
Town of Cold Spring	6.1 mi	48.5% (±11.9 points)	Not measurably different
Whitewater	6.5 mi	49.3% (±6.5 points)	Not measurably different
Town of Lima (Rock County)	6.6 mi	67.3% (±15.8 points)	Not measurably different
Town of Hebron	6.7 mi	75.2% (±19.9 points)	Not measurably different
Town of Sumner (Jefferson County)	7.4 mi	75.0% (±13.3 points)	Higher
Jefferson	7.8 mi	58.8% (±8.2 points)	Not measurably different

Nearby places with a measurably higher figure: Fort Atkinson, WI (69.0%), Town of Sumner (Jefferson County), WI (75.0%).

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

Homes built before 1980 across Jefferson County, place by place

Rank	Place	Homes built before 1980
11	Jefferson	58.8% (±8.2 points)
12	Town of Concord	58.6% (±13.4 points)
13	Town of Watertown	57.9% (±10.1 points)
14	Sullivan	57.1% (±13.2 points)
15	Town of Jefferson (Jefferson County)	55.0% (±13.7 points)
16	Lake Mills	53.6% (±9.9 points)
17	Town of Koshkonong	52.9% (±10.2 points)
18	Town of Ixonia	49.5% (±12.6 points)
19	Town of Waterloo (Jefferson County)	49.1% (±12.5 points)
20	Town of Cold Spring	48.5% (±11.9 points)
21	Town of Oakland (Jefferson County)	46.6% (±11.2 points)
22	Town of Lake Mills	42.3% (±9.7 points)
23	Town of Sullivan	39.6% (±8.5 points)

Showing 13 of 24 places in Jefferson County, ranked from highest to lowest.

The figures for the Town of Koshkonong include the places inside it that have pages of their own: Lake Koshkonong.

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 Town of Koshkonong

How old are most homes in the Town of Koshkonong?

52.9% of homes in the Town of Koshkonong, WI were built before 1980 (2020–2024 American Community Survey).

Do homes in the Town of Koshkonong 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 33.4% and 52.9% of homes in the Town of Koshkonong were built before then.

Does a contractor need lead certification to work on older homes in the Town of Koshkonong?

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 — Koshkonong town, Jefferson 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 Koshkonong town, Jefferson County, Wisconsin (county subdivision:40375, in state:55 county:055).

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.