How old are the homes in Mount Arlington Borough, NJ?

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

44.4% (±8.6 points) of the homes in Mount Arlington Borough, NJ were built before 1980 (2020–2024 American Community Survey).

8.8% were built before 1940.

11.4% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 44.4% (±8.6 points)
Built before 1940: 8.8%
Built 2010 or later: 11.4%

When the homes in Mount Arlington Borough were built

Housing units by year structure built, 2020–2024
Year built	Mount Arlington Borough	Morris County	New Jersey	United States
2020 or later	0.0% (±1.5 points)	0.9%	1.1%	2.0%
2010 to 2019	11.4% (±3.3 points)	5.2%	6.2%	9.4%
2000 to 2009	14.2% (±5.3 points)	7.5%	9.2%	13.6%
1990 to 1999	25.6% (±5.4 points)	11.3%	8.9%	12.4%
1980 to 1989	4.4% (±2.4 points)	12.6%	11.8%	12.9%
1970 to 1979	12.4% (±4.7 points)	13.5%	12.3%	14.2%
1960 to 1969	13.8% (±5.0 points)	16.0%	12.8%	9.9%
1950 to 1959	6.6% (±3.3 points)	14.7%	13.8%	9.5%
1940 to 1949	2.8% (±1.7 points)	5.8%	6.5%	4.4%
1939 or earlier	8.8% (±3.6 points)	12.4%	17.4%	11.7%

In Mount Arlington Borough, the share of homes built before 1980 is lower than in Morris County (62.4%).

It is also lower than in New Jersey (62.8%).

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

In Morris County, Mount Arlington Borough ranks 37 of 39 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 485 of 564.

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 (32.0%) and the share built before 1980 (44.4%).

Homes built before 1980 in places near Mount Arlington Borough

Nearest places with a published estimate, compared with Mount Arlington Borough
Place	Distance	Homes built before 1980	Compared with this place
Mount Arlington Borough	—	44.4% (±8.6 points)	—
Landing	1.5 mi	75.9% (±14.2 points)	Higher
Roxbury Township	2.3 mi	64.7% (±5.5 points)	Higher
Hopatcong Borough	2.4 mi	83.0% (±7.4 points)	Higher
Ledgewood	3.0 mi	32.1% (±8.0 points)	Lower
Kenvil	3.0 mi	92.8% (±23.6 points)	Higher
Lake Hopatcong	3.1 mi	72.4% (±11.2 points)	Higher
Stanhope Borough	3.3 mi	73.6% (±13.4 points)	Higher
Netcong Borough	3.5 mi	87.4% (±21.2 points)	Higher

Nearby places with a measurably lower figure: Ledgewood, NJ (32.1%).

Nearby places with a measurably higher figure: Landing, NJ (75.9%), Roxbury Township, NJ (64.7%), Hopatcong Borough, NJ (83.0%).

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

Homes built before 1980 across Morris County, place by place

Rank	Place	Homes built before 1980
31	Mendham Township	56.0% (±11.5 points)
32	Randolph Township	55.6% (±5.8 points)
33	Mount Olive Township	54.0% (±5.1 points)
34	Washington Township (Morris County)	51.7% (±6.5 points)
35	Montville Township	50.9% (±6.8 points)
36	Chester Township	47.4% (±8.5 points)
37	Mount Arlington Borough	44.4% (±8.6 points)
38	Riverdale Borough	42.1% (±7.9 points)
39	Florham Park Borough	42.0% (±5.9 points)

Showing 9 of 39 places in Morris 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 Mount Arlington Borough

How old are most homes in Mount Arlington Borough?

44.4% of homes in Mount Arlington Borough, NJ were built before 1980 (2020–2024 American Community Survey).

Do homes in Mount Arlington Borough 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 32.0% and 44.4% of homes in Mount Arlington Borough were built before then.

Does a contractor need lead certification to work on older homes in Mount Arlington Borough?

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 — Mount Arlington borough, Morris County, New Jersey

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 Mount Arlington borough, Morris County, New Jersey (county subdivision:48690, in state:34 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.