How old are the homes in Hamilton Township (Mercer County), NJ?

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

74.6% (±3.6 points) of the homes in Hamilton Township (Mercer County), NJ were built before 1980 (2020–2024 American Community Survey).

14.0% were built before 1940.

3.8% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 74.6% (±3.6 points)
Built before 1940: 14.0%
Built 2010 or later: 3.8%

When the homes in Hamilton Township (Mercer County) were built

Housing units by year structure built, 2020–2024
Year built	Hamilton Township (Mercer County)	Mercer County	New Jersey	United States
2020 or later	0.7% (±0.5 points)	0.9%	1.1%	2.0%
2010 to 2019	3.1% (±0.7 points)	4.8%	6.2%	9.4%
2000 to 2009	5.8% (±1.0 points)	9.0%	9.2%	13.6%
1990 to 1999	5.3% (±0.9 points)	8.5%	8.9%	12.4%
1980 to 1989	10.6% (±1.3 points)	12.6%	11.8%	12.9%
1970 to 1979	15.0% (±1.6 points)	12.9%	12.3%	14.2%
1960 to 1969	16.7% (±1.7 points)	12.9%	12.8%	9.9%
1950 to 1959	22.0% (±1.9 points)	15.0%	13.8%	9.5%
1940 to 1949	6.9% (±0.9 points)	5.5%	6.5%	4.4%
1939 or earlier	14.0% (±1.7 points)	17.9%	17.4%	11.7%

In Hamilton Township (Mercer County), the share of homes built before 1980 is higher than in Mercer County (64.2%).

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

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

In Mercer County, Hamilton Township (Mercer County) ranks 4 of 12 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 198 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 (59.6%) and the share built before 1980 (74.6%).

Homes built before 1980 in places near Hamilton Township (Mercer County)

Nearest places with a published estimate, compared with Hamilton Township (Mercer County)
Place	Distance	Homes built before 1980	Compared with this place
Hamilton Township (Mercer County)	—	74.6% (±3.6 points)	—
Robbinsville Center	2.6 mi	17.1% (±10.5 points)	Lower
Bordentown	4.3 mi	88.1% (±9.9 points)	Higher
Robbinsville Township	4.4 mi	18.5% (±4.1 points)	Lower
Trenton	4.8 mi	79.3% (±4.2 points)	Not measurably different
Allentown Borough	4.9 mi	86.8% (±11.4 points)	Higher
Bordentown Township	5.4 mi	47.9% (±6.7 points)	Lower
Morrisville	5.5 mi	84.0% (±13.3 points)	Not measurably different
Fieldsboro Borough	5.8 mi	62.5% (±14.5 points)	Not measurably different

Nearby places with a measurably lower figure: Robbinsville Center, NJ (17.1%), Robbinsville Township, NJ (18.5%), Bordentown Township, NJ (47.9%).

Nearby places with a measurably higher figure: Bordentown, NJ (88.1%), Allentown Borough, NJ (86.8%).

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

Homes built before 1980 across Mercer County, place by place

Rank	Place	Homes built before 1980
1	Trenton	79.3% (±4.2 points)
2	Hopewell Borough	79.0% (±10.5 points)
3	Hightstown Borough	75.6% (±16.6 points)
4	Hamilton Township (Mercer County)	74.6% (±3.6 points)
5	Ewing Township	71.6% (±5.6 points)
6	Pennington Borough	71.2% (±10.2 points)
7	Princeton	63.8% (±6.0 points)
8	East Windsor Township	59.8% (±5.6 points)
9	Hopewell Township (Mercer County)	53.0% (±7.0 points)
10	Lawrence Township (Mercer County)	51.2% (±4.9 points)

Showing 10 of 12 places in Mercer County, ranked from highest to lowest.

The figures for Hamilton Township (Mercer County) include the places inside it that have pages of their own: Groveville, Hamilton Square, Mercerville, White Horse, Yardville.

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 Hamilton Township (Mercer County)

How old are most homes in Hamilton Township (Mercer County)?

74.6% of homes in Hamilton Township (Mercer County), NJ were built before 1980 (2020–2024 American Community Survey).

Do homes in Hamilton Township (Mercer County) 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 59.6% and 74.6% of homes in Hamilton Township (Mercer County) were built before then.

Does a contractor need lead certification to work on older homes in Hamilton Township (Mercer County)?

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 — Hamilton township, Mercer 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 Hamilton township, Mercer County, New Jersey (county subdivision:29310, in state:34 county:021).

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.