How old are the homes in Mars, PA?

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

83.8% (±15.4 points) of the homes in Mars, PA were built before 1980 (2020–2024 American Community Survey).

33.6% were built before 1940.

3.7% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 83.8% (±15.4 points)
Built before 1940: 33.6%
Built 2010 or later: 3.7%

When the homes in Mars were built

Housing units by year structure built, 2020–2024
Year built	Mars	Butler County	Pennsylvania	United States
2020 or later	0.0% (±4.8 points)	2.4%	1.0%	2.0%
2010 to 2019	3.7% (±3.6 points)	9.6%	5.1%	9.4%
2000 to 2009	3.1% (±2.8 points)	13.2%	8.1%	13.6%
1990 to 1999	2.3% (±3.3 points)	14.3%	8.9%	12.4%
1980 to 1989	7.2% (±5.3 points)	10.3%	9.6%	12.9%
1970 to 1979	30.2% (±8.7 points)	11.9%	12.4%	14.2%
1960 to 1969	15.1% (±7.2 points)	8.6%	9.9%	9.9%
1950 to 1959	4.6% (±4.1 points)	9.4%	13.0%	9.5%
1940 to 1949	0.3% (±1.2 points)	4.8%	7.0%	4.4%
1939 or earlier	33.6% (±9.5 points)	15.5%	25.0%	11.7%

In Mars, the share of homes built before 1980 is higher than in Butler County (50.2%).

It is also higher than in Pennsylvania (67.3%).

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

In Butler County, Mars ranks 9 of 57 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 565 of 2,558.

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 (53.6%) and the share built before 1980 (83.8%).

Homes built before 1980 in places near Mars

Nearest places with a published estimate, compared with Mars
Place	Distance	Homes built before 1980	Compared with this place
Mars	—	83.8% (±15.4 points)	—
Adams Township (Butler County)	1.5 mi	19.5% (±4.9 points)	Lower
Valencia	1.9 mi	28.0% (±12.9 points)	Lower
Seven Fields	2.7 mi	8.4% (±6.1 points)	Lower
Callery	3.2 mi	65.8% (±23.4 points)	Not measurably different
Pine Township (Allegheny County)	3.8 mi	18.5% (±4.9 points)	Lower
Middlesex Township (Butler County)	4.6 mi	55.9% (±12.0 points)	Lower
Richland Township (Allegheny County)	4.7 mi	46.5% (±9.1 points)	Lower
Cranberry Township (Butler County)	4.9 mi	20.1% (±2.5 points)	Lower

Nearby places with a measurably lower figure: Adams Township (Butler County), PA (19.5%), Valencia, PA (28.0%), Seven Fields, PA (8.4%).

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

Homes built before 1980 across Butler County, place by place

Rank	Place	Homes built before 1980
3	Eau Claire	90.7% (±20.4 points)
4	Evans City	89.7% (±11.4 points)
5	Karns City	88.9% (±44.1 points)
6	West Sunbury	86.1% (±37.6 points)
7	Fairview	85.5% (±35.5 points)
8	Bruin	84.1% (±17.8 points)
9	Mars	83.8% (±15.4 points)
10	Harmony	81.4% (±17.0 points)
11 (tie)	Chicora	79.0% (±15.9 points)
11 (tie)	Portersville	79.0% (±21.5 points)
13	Harrisville	76.6% (±13.9 points)
14	East Butler	76.3% (±19.3 points)
15	Fairview Township (Butler County)	75.2% (±14.6 points)

Showing 13 of 57 places in Butler 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 Mars

One account for renting, owning, managing and fixing homes, with these figures beside you.

Do repairs, renovations or maintenance?

Get found by owners and renters near Mars, and send estimates and invoices from your phone.

Join as a pro · Find a pro

Own or manage a rental?

List it, sign the lease and collect rent online, with the figures for Mars beside you.

Create a landlord account · See what landlords get

Looking for a place to rent?

Browse homes for rent near Mars, save the ones you like and apply online.

Browse rentals · Create a renter account

Questions about Mars

How old are most homes in Mars?

83.8% of homes in Mars, PA were built before 1980 (2020–2024 American Community Survey).

Do homes in Mars 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 53.6% and 83.8% of homes in Mars were built before then.

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

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 — Mars borough, Pennsylvania

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 Mars borough, Pennsylvania (place:47672, in state:42).

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.