How old are the homes in Monmouth Junction, NJ?

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

18.0% (±5.8 points) of the homes in Monmouth Junction, NJ were built before 1980 (2020–2024 American Community Survey).

2.8% were built before 1940.

13.9% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 18.0% (±5.8 points)
Built before 1940: 2.8%
Built 2010 or later: 13.9%

When the homes in Monmouth Junction were built

Housing units by year structure built, 2020–2024
Year built	Monmouth Junction	Middlesex County	New Jersey	United States
2020 or later	0.4% (±0.6 points)	0.9%	1.1%	2.0%
2010 to 2019	13.5% (±5.3 points)	6.6%	6.2%	9.4%
2000 to 2009	8.2% (±2.9 points)	9.0%	9.2%	13.6%
1990 to 1999	37.1% (±6.0 points)	10.0%	8.9%	12.4%
1980 to 1989	22.8% (±5.1 points)	16.0%	11.8%	12.9%
1970 to 1979	7.7% (±3.3 points)	11.7%	12.3%	14.2%
1960 to 1969	4.3% (±3.1 points)	14.9%	12.8%	9.9%
1950 to 1959	3.2% (±2.9 points)	15.2%	13.8%	9.5%
1940 to 1949	0.0% (±1.3 points)	5.2%	6.5%	4.4%
1939 or earlier	2.8% (±1.9 points)	10.4%	17.4%	11.7%

In Monmouth Junction, the share of homes built before 1980 is lower than in Middlesex County (57.4%).

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

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

In Middlesex County, Monmouth Junction ranks 23 of 32 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 228 of 252.

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 (10.3%) and the share built before 1980 (18.0%).

Homes built before 1980 in places near Monmouth Junction

Nearest places with a published estimate, compared with Monmouth Junction
Place	Distance	Homes built before 1980	Compared with this place
Monmouth Junction	—	18.0% (±5.8 points)	—
Heathcote	1.5 mi	12.9% (±6.4 points)	Not measurably different
Kendall Park	2.6 mi	58.7% (±8.4 points)	Higher
Dayton	2.6 mi	20.1% (±5.7 points)	Not measurably different
Princeton Meadows	2.8 mi	22.7% (±4.9 points)	Not measurably different
Plainsboro Township	2.9 mi	25.7% (±4.5 points)	Higher
Deans	2.9 mi	10.3% (±20.5 points)	Not measurably different
Kingston	3.0 mi	68.7% (±30.6 points)	Higher
Plainsboro Center	3.6 mi	52.0% (±15.1 points)	Higher

Nearby places with a measurably higher figure: Kendall Park, NJ (58.7%), Plainsboro Township, NJ (25.7%), Kingston, NJ (68.7%).

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

Homes built before 1980 across Middlesex County, place by place

Rank	Place	Homes built before 1980
17	Avenel	52.6% (±7.8 points)
18	Plainsboro Center	52.0% (±15.1 points)
19	Cranbury	49.7% (±15.4 points)
20	Brownville	32.0% (±10.3 points)
21	Princeton Meadows	22.7% (±4.9 points)
22	Dayton	20.1% (±5.7 points)
23	Monmouth Junction	18.0% (±5.8 points)
24	Concordia	13.6% (±7.5 points)
25	Whittingham	13.4% (±6.7 points)
26	Heathcote	12.9% (±6.4 points)
27	Deans	10.3% (±20.5 points)
28	Monroe Manor	8.2% (±18.3 points)
29	Forsgate	4.5% (±11.9 points)

Showing 13 of 32 places in Middlesex County, ranked from highest to lowest.

Monmouth Junction is a census-designated place: an unincorporated community the Census Bureau draws for statistics, with no municipal government of its own.

It lies inside South Brunswick Township, whose figures include it.

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 Monmouth Junction

How old are most homes in Monmouth Junction?

18.0% of homes in Monmouth Junction, NJ were built before 1980 (2020–2024 American Community Survey).

Do homes in Monmouth Junction 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 10.3% and 18.0% of homes in Monmouth Junction were built before then.

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

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 — Monmouth Junction CDP, 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 Monmouth Junction CDP, New Jersey (place:47190, in state:34).

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.