Township · New Jersey
Hamilton Township, Mercer County, New Jersey
Hamilton Township, Mercer County, township, in Mercer County, New Jersey. Hamilton Township, Mercer County had 94,157 residents on July 1, 2025 by the Census Bureau's estimate, up 2.0% since 2020; the 2020 Census counted 92,297 and the ACS 2020-2024 5-year estimates put it at 92,506 (±80). GEOID 3402129310.
Residents, July 2025 estimate
94,157
Census Bureau estimate (no margin published)
2020 Census count: 92,297 · ACS 2020-2024: 92,506 ±80
Median household income
$100,771
±$3,960 (90% margin)
New Jersey: $103,556
Median home value
$335,500
±$7,271 (90% margin)
New Jersey: $454,400
Median gross rent
$1,634
±$59 (90% margin)
New Jersey: $1,720
Where is Hamilton Township, Mercer County and what county is it in?
Hamilton Township, Mercer County is a township in Mercer County, New Jersey. It covers 39.4 square miles of land, 2,340 residents per square mile in 2020.
5 places lie inside Hamilton Township (Mercer County): Mercerville (CDP, 13,447 in 2020), Hamilton Square (CDP, 12,679 in 2020), White Horse (CDP, 9,791 in 2020), Yardville (CDP, 6,965 in 2020) and Groveville (CDP, 3,106 in 2020).
Hamilton Township, Mercer County is in the Trenton-Princeton, NJ metropolitan statistical area (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Hamilton Township, Mercer County, and is it growing?
The Census Bureau estimates that 94,157 people lived in Hamilton Township, Mercer County on July 1, 2025, up 2.0% since 2020, slower than New Jersey (+2.8%). The 2020 Census counted 92,297 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 92,506 (±80).
| Measure | Hamilton Township, Mercer County | Mercer County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 92,506±80 | 385,864 | +5,082 |
| Households | 36,705±970 | 144,114 | +3,769 |
| Average household size | 2.50±0.07 | 2.56 | −0.14 |
| Housing units | 37,628±959 | 151,138 | +2,699 |
Hamilton Township, Mercer County's population since 2000
From 87,109 in 2000 to 94,157 in 2025: up 8.1%. The 2000, 2010 and 2020 figures are census counts, each for Hamilton Township, Mercer County as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Hamilton Township, Mercer County?
The median resident of Hamilton Township, Mercer County is 42.0 years old; 19.9% are under 18 and 20.1% are 65 or older. The largest group is non-Hispanic white residents at 56.6%, then Hispanic or Latino residents (of any race) at 23.7%. 20.1% of residents were born outside the United States.
| Measure | Hamilton Township, Mercer County | Mercer County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 42.0±1.3 | 39.5 | no clear change |
| Under 18 years | 19.9%±1.4 pts | 22.0% | – |
| 65 years and over | 20.1%±0.9 pts | 16.0% | – |
| Male | 49.9%±1.2 pts | 49.4% | – |
| Hispanic or Latino (any race) | 23.7%±1.6 pts | 23.1% | +7.9 pts |
| White alone, not Hispanic | 56.6%±1.9 pts | 42.7% | −7.1 pts |
| Black or African American alone, not Hispanic | 12.2%±1.6 pts | 17.9% | −2.2 pts |
| Asian alone, not Hispanic | 3.8%±0.8 pts | 12.3% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±0.1 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.1 pts | 0.0% | – |
| Two or more races, not Hispanic | 2.9%±0.7 pts | 3.4% | – |
| Some other race alone, not Hispanic | 0.7%±0.4 pts | 0.5% | – |
| Born outside the United States | 20.1%±1.7 pts | 27.0% | +3.5 pts |
| Speak a language other than English at home (age 5+) | 28.3%±2.0 pts | 35.7% | – |
| Civilian veterans (age 18+) | 4.5%±0.6 pts | 3.4% | – |
| With a disability | 12.8%±1.2 pts | 10.7% | – |
| No health insurance coverage | 7.0%±1.2 pts | 7.9% | no clear change |
| High school graduate or higher (age 25+) | 91.4%±1.1 pts | 89.4% | – |
| Bachelor's degree or higher (age 25+) | 34.5%±2.1 pts | 45.4% | +3.9 pts |
| Graduate or professional degree (age 25+) | 10.5%±1.1 pts | 21.2% | – |
| Lived in the same house a year earlier | 92.3%±1.3 pts | 88.0% | – |
| Moved from another state in the past year | 1.2%±0.5 pts | 2.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Hamilton Township, Mercer County earn?
Half of Hamilton Township, Mercer County's 36,705 households earn less than $100,771 a year (±$3,960), against $100,645 in Mercer County and $103,556 in New Jersey. In 2015-2019 it was $96,212 in 2024 dollars; the margins of error cannot tell the two periods apart. 6.7% of residents live below the poverty line.
| Measure | Hamilton Township, Mercer County | Mercer County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $100,771±$3,960 | $100,645 | no clear change |
| Mean household income | $119,855±$3,762 | $142,368 | – |
| Per capita income | $47,521±$1,553 | $53,765 | no clear change |
| People below the poverty line | 6.7%±1.3 pts | 10.3% | no clear change |
| Children under 18 below the poverty line | 9.0%±3.1 pts | 13.2% | no clear change |
| Households receiving SNAP | 5.9%±1.2 pts | 9.3% | – |
| Households with a computer | 96.2%±0.9 pts | 95.6% | – |
| Households with a broadband subscription | 93.0%±1.1 pts | 91.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Hamilton Township, Mercer County?
Owners occupy 71.6% of Hamilton Township, Mercer County's occupied homes and renters 28.4%. The median owner-occupied home is valued at $335,500 by its owner (±$7,271). The median renter pays $1,634 a month including utilities, and 44.0% of renters pay 35% or more of their income on rent.
| Measure | Hamilton Township, Mercer County | Mercer County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $335,500±$7,271 | $377,700 | +$30,288 |
| Median gross rent | $1,634±$59 | $1,623 | no clear change |
| Renters paying 35% or more of income on rent | 44.0%±5.6 pts | 41.3% | no clear change |
| Median monthly owner costs, with a mortgage | $2,350±$56 | $2,615 | – |
| Owner-occupied homes | 71.6%±2.0 pts | 62.2% | no clear change |
| Renter-occupied homes | 28.4%±2.0 pts | 37.8% | – |
| Housing units | 37,628±959 | 151,138 | +2,699 |
| Homeowner vacancy rate | 0.4%±0.4 pts | 0.4% | – |
| Rental vacancy rate | 2.1%±1.5 pts | 2.9% | – |
| Single-family detached homes | 63.1%±1.9 pts | 47.5% | – |
| Mobile homes | 0.6%±0.5 pts | 0.5% | – |
| Built 2020 or later | 0.7%±0.5 pts | 0.9% | – |
| Built 2010 to 2019 | 3.1%±0.7 pts | 4.8% | – |
| Built 1939 or earlier | 14.0%±1.7 pts | 17.9% | – |
| Households with no vehicle | 7.2%±1.1 pts | 11.2% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Hamilton Township, Mercer County building?
Builders took permits for 33 new housing units in Hamilton Township, Mercer County in 2025 (29 in single-family houses), 0.4 per 1,000 residents against 2.9 across New Jersey.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Hamilton Township, Mercer County work and get to work?
74.2% of Hamilton Township, Mercer County's workers drive alone and 12.9% work from home. The average trip to work takes 24.7 minutes. The unemployment rate in 2020-2024 averaged 5.9%.
| Measure | Hamilton Township, Mercer County | Mercer County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 65.5%±1.4 pts | 65.3% | – |
| Unemployment rate | 5.9%±1.1 pts | 6.3% | no clear change |
| Drove alone to work | 74.2%±2.1 pts | 60.2% | – |
| Carpooled | 9.0%±1.4 pts | 8.7% | – |
| Public transportation | 1.8%±0.5 pts | 4.6% | – |
| Walked | 0.6%±0.2 pts | 3.6% | – |
| Worked from home | 12.9%±1.6 pts | 19.5% | +9.2 pts |
| Mean travel time to work | 24.7 min±0.8 | 27.1 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Hamilton Township, Mercer County?
17 census tracts lie mostly in Hamilton Township, Mercer County (2020 census blocks). Their median household incomes run from $65,886 (Tract 30.09) to $144,623 (Tract 29.04).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 25Mercer County | 8,747 | $91,250 |
| Tract 27.02Mercer County | 7,022 | $73,633 |
| Tract 28Mercer County | 6,655 | $93,341 |
| Tract 30.01Mercer County | 5,852 | $118,804 |
| Tract 30.02Mercer County | 5,852 | $134,257 |
| Tract 30.09Mercer County | 5,670 | $65,886 |
| Tract 30.03Mercer County | 5,665 | $86,844 |
| Tract 30.04Mercer County | 5,607 | $103,103 |
| Tract 29.02Mercer County | 5,404 | $97,167 |
| Tract 30.08Mercer County | 5,342 | $133,110 |
| Tract 30.06Mercer County | 4,956 | $137,982 |
| Tract 26.01Mercer County | 4,936 | $86,875 |
Every census tract in Hamilton Township, Mercer County, with its figures
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Hamilton Township, Mercer County) · Census block assignment files
How does Hamilton Township, Mercer County compare with other places in New Jersey?
By the Census Bureau's July 2025 estimates, Hamilton Township, Mercer County is the 53rd-most populous of the 16,079 U.S. towns and townships that have one and the 5th-most populous of 241 in New Jersey.
Hamilton Township, Mercer County ranks 490th of 771 places in New Jersey with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 5th | 241 |
| Growth 2020-2025 (PEP) | 264th | 532 |
| Residents per square mile | 366th | 787 |
| Median household income | 490th | 771 |
| Per capita income | 523rd | 785 |
| Median home value | 583rd | 777 |
| Median gross rent | 470th | 701 |
| Poverty rate | 279th | 539 |
| Bachelor's degree or higher | 517th | 780 |
| Median age | 426th | 786 |
| Owner-occupied share | 508th | 777 |
| Work from home | 483rd | 695 |
| Travel time to work | 672nd | 787 |
Hamilton Township, Mercer County's figures with every place in New Jersey (CSV)
Every place in New Jersey, sortable · Compare Hamilton Township, Mercer County with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Hamilton Township, Mercer County?
6 of the 57 figures for Hamilton Township, Mercer County on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Hamilton Township, Mercer County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.