How old are the homes in Hillsborough, NJ?

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

30.9% (±4.2 points) of the homes in Hillsborough, NJ were built before 1980 (2020–2024 American Community Survey).

1.1% were built before 1940.

3.0% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 30.9% (±4.2 points)
Built before 1940: 1.1%
Built 2010 or later: 3.0%

When the homes in Hillsborough were built

Housing units by year structure built, 2020–2024
Year built	Hillsborough	Somerset County	New Jersey	United States
2020 or later	1.3% (±0.8 points)	1.3%	1.1%	2.0%
2010 to 2019	1.7% (±1.2 points)	6.1%	6.2%	9.4%
2000 to 2009	3.2% (±1.3 points)	9.7%	9.2%	13.6%
1990 to 1999	21.4% (±3.1 points)	16.8%	8.9%	12.4%
1980 to 1989	41.5% (±4.2 points)	19.7%	11.8%	12.9%
1970 to 1979	21.2% (±3.4 points)	9.3%	12.3%	14.2%
1960 to 1969	3.8% (±1.4 points)	12.9%	12.8%	9.9%
1950 to 1959	4.5% (±2.0 points)	10.3%	13.8%	9.5%
1940 to 1949	0.3% (±0.3 points)	4.5%	6.5%	4.4%
1939 or earlier	1.1% (±0.6 points)	9.3%	17.4%	11.7%

In Hillsborough, the share of homes built before 1980 is lower than in Somerset County (46.3%).

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

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

In Somerset County, Hillsborough ranks 14 of 24 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 205 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 (9.7%) and the share built before 1980 (30.9%).

Homes built before 1980 in places near Hillsborough

Nearest places with a published estimate, compared with Hillsborough
Place	Distance	Homes built before 1980	Compared with this place
Hillsborough	—	30.9% (±4.2 points)	—
Belle Mead	2.7 mi	12.9% (±8.4 points)	Lower
Millstone Borough	3.1 mi	96.7% (±27.6 points)	Higher
Blackwells Mills	3.4 mi	31.2% (±6.0 points)	Not measurably different
Manville Borough	4.1 mi	87.2% (±10.8 points)	Higher
Weston	4.3 mi	1.3% (±7.6 points)	Lower
Raritan Borough	4.4 mi	58.3% (±8.8 points)	Higher
Bradley Gardens	4.5 mi	23.9% (±4.8 points)	Lower
Neshanic Station	4.6 mi	25.3% (±9.0 points)	Not measurably different

Nearby places with a measurably lower figure: Belle Mead, NJ (12.9%), Weston, NJ (1.3%), Bradley Gardens, NJ (23.9%).

Nearby places with a measurably higher figure: Millstone Borough, NJ (96.7%), Manville Borough, NJ (87.2%), Raritan Borough, NJ (58.3%).

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

Homes built before 1980 across Somerset County, place by place

Rank	Place	Homes built before 1980
8	Finderne	56.6% (±13.1 points)
9	Green Knoll	51.1% (±8.2 points)
10	Somerset	49.4% (±6.2 points)
11	Liberty Corner	48.0% (±16.7 points)
12	Lyons	32.8% (±9.2 points)
13	Blackwells Mills	31.2% (±6.0 points)
14	Hillsborough	30.9% (±4.2 points)
15	Ten Mile Run	30.3% (±21.5 points)
16	Voorhees	28.5% (±16.3 points)
17	Neshanic Station	25.3% (±9.0 points)
18	Bradley Gardens	23.9% (±4.8 points)
19	Franklin Center	19.5% (±7.7 points)
20	Six Mile Run	16.6% (±9.6 points)

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

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

It lies inside Hillsborough 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 Hillsborough

How old are most homes in Hillsborough?

30.9% of homes in Hillsborough, NJ were built before 1980 (2020–2024 American Community Survey).

Do homes in Hillsborough 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 9.7% and 30.9% of homes in Hillsborough were built before then.

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

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 — Hillsborough 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 Hillsborough CDP, New Jersey (place:31880, 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.