Census tract · Mercer County
Census Tract 39.04, Mercer County, New Jersey
Census Tract 39.04, GEOID 34021003904, in Mercer County, New Jersey, entirely within Hopewell Township, Mercer County. 5,951 residents in the ACS 2020-2024 5-year estimates (±607); the 2020 Census counted 6,122.
Residents, 2020-2024
5,951
±607 (90% margin)
2020 Census count: 6,122
Median household income
$164,554
±$29,706 (90% margin)
Mercer County: $100,645
Median home value
$495,800
±$34,514 (90% margin)
Mercer County: $377,700
Median gross rent
$1,424
±$313 (90% margin)
Mercer County: $1,623
Where is Census Tract 39.04?
Census Tract 39.04 is one of 84 census tracts in Mercer County, New Jersey. It covers 6.20 square miles of land, 987 residents per square mile in 2020. Its GEOID, 34021003904, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Hopewell Township, Mercer County | 100% |
7 census tracts border Census Tract 39.04: Tract 32.01 ($117,179), Tract 33.04 ($219,091), Tract 37.03 ($104,715), Tract 37.04 ($142,120), Tract 38 ($171,250), Tract 39.03 ($192,586) and Tract 39.05 ($230,125). The figure in brackets is each tract's median household income.
Whether a tract counts as low- or moderate-income for bank lending (the Community Reinvestment Act) is set by the FFIEC against its metro area's family income: look it up in the FFIEC census geocoder.
Source: 2024 Gazetteer and 2020 block assignment files, U.S. Census Bureau · Census reference files
How many people live in Census Tract 39.04?
The 2020-2024 American Community Survey puts Census Tract 39.04's population at 5,951 (±607) in 2,271 households; the 2020 Census counted 6,122 residents and 2,471 housing units.
| Measure | Tract 39.04 | Hopewell Township, Mercer County |
|---|---|---|
| Total population | 5,951 ±607 | 17,595 |
| Households | 2,271 ±180 | 6,288 |
| Average household size | 2.61 ±0.21 | 2.72 |
| Housing units | 2,289 ±174 | 6,612 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Census Tract 39.04?
The median resident of Census Tract 39.04 is 39.8 years old; 26.2% are under 18 and 17.7% are 65 or older. The largest group is non-Hispanic white residents at 61.5%, then non-Hispanic Asian residents at 29.2%. 22.6% of residents were born outside the United States.
| Measure | Tract 39.04 | Hopewell Township, Mercer County |
|---|---|---|
| Median age | 39.8 ±3.3 | 41.9 |
| Under 18 years | 26.2% ±4.1 pts | 23.7% |
| 65 years and over | 17.7% ±4.1 pts | 17.4% |
| Hispanic or Latino (any race) | 3.4% ±3.0 pts | 4.0% |
| White alone, not Hispanic | 61.5% ±8.5 pts | 72.9% |
| Black or African American alone, not Hispanic | 2.3% ±2.2 pts | 3.8% |
| Asian alone, not Hispanic | 29.2% ±9.9 pts | 14.2% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.8 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.8 pts | 0.0% |
| Two or more races, not Hispanic | 3.6% ±2.7 pts | 4.7% |
| Some other race alone, not Hispanic | 0.0% ±0.8 pts | 0.3% |
| Born outside the United States | 22.6% ±6.1 pts | 16.8% |
| Speak a language other than English at home (age 5+) | 27.4% ±8.4 pts | 18.5% |
| Civilian veterans (age 18+) | 3.9% ±2.0 pts | 3.4% |
| With a disability | 8.0% ±3.0 pts | 9.3% |
| No health insurance coverage | 1.3% ±1.6 pts | 1.5% |
| High school graduate or higher (age 25+) | 97.4% ±2.4 pts | 97.4% |
| Bachelor's degree or higher (age 25+) | 73.4% ±4.9 pts | 66.6% |
| Graduate or professional degree (age 25+) | 36.1% ±6.6 pts | 32.8% |
| Lived in the same house a year earlier | 95.4% ±2.7 pts | 91.6% |
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 Census Tract 39.04 earn?
Half of the 2,271 households in Census Tract 39.04 earn less than $164,554 a year (±$29,706), against $100,645 across Mercer County: 17th highest of the county's 81 tracts with a reliable estimate. 3.5% of residents live below the poverty line.
| Measure | Tract 39.04 | Hopewell Township, Mercer County |
|---|---|---|
| Median household income | $164,554 ±$29,706 | $178,167 |
| Mean household income | $193,426 ±$21,979 | $224,501 |
| Per capita income | $72,401 ±$9,500 | $80,522 |
| People below the poverty line | 3.5% ±2.1 pts | 3.2% |
| Children under 18 below the poverty line | 2.8% ±3.5 pts | 1.1% |
| Households receiving SNAP | 4.0% ±3.2 pts | 1.6% |
| Households with a computer | 99.3% ±1.1 pts | 99.0% |
| Households with a broadband subscription | 98.2% ±1.7 pts | 98.3% |
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 Census Tract 39.04?
Owners occupy 92.2% of Census Tract 39.04's occupied homes and renters 7.8%. The median owner-occupied home is valued at $495,800 by its owner (±$34,514). The median renter pays $1,424 a month including utilities, and 58.2% of renters pay 35% or more of their income on rent.
| Measure | Tract 39.04 | Hopewell Township, Mercer County |
|---|---|---|
| Median home value (owner-occupied) | $495,800 ±$34,514 | $561,900 |
| Median gross rent | $1,424 ±$313 | $2,128 |
| Renters paying 35% or more of income on rent | 58.2% ±21.6 pts | 39.0% |
| Median monthly owner costs, with a mortgage | $3,102 ±$352 | $3,609 |
| Owner-occupied homes | 92.2% ±3.7 pts | 91.2% |
| Renter-occupied homes | 7.8% ±3.7 pts | 8.8% |
| Housing units | 2,289 ±174 | 6,612 |
| Single-family detached homes | 70.0% ±5.7 pts | 85.5% |
| Mobile homes | 0.0% ±1.9 pts | 0.0% |
| Built 2020 or later | 0.0% ±1.9 pts | 0.0% |
| Built 2010 to 2019 | 3.8% ±3.6 pts | 2.2% |
| Built 1939 or earlier | 3.8% ±3.3 pts | 12.1% |
| Households with no vehicle | 3.7% ±2.4 pts | 2.3% |
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 do people in Census Tract 39.04 get to work?
60.0% of Census Tract 39.04's workers drive alone and 32.0% work from home. The average trip to work takes 29.6 minutes. The unemployment rate in 2020-2024 averaged 4.4%.
| Measure | Tract 39.04 | Hopewell Township, Mercer County |
|---|---|---|
| In the labor force (age 16+) | 66.9% ±5.1 pts | 67.6% |
| Unemployment rate | 4.4% ±2.6 pts | 4.0% |
| Drove alone to work | 60.0% ±9.2 pts | 62.8% |
| Carpooled | 3.6% ±3.1 pts | 3.6% |
| Public transportation | 4.3% ±4.0 pts | 2.2% |
| Walked | 0.0% ±1.5 pts | 0.1% |
| Worked from home | 32.0% ±8.6 pts | 31.1% |
| Mean travel time to work | 29.6 min ±5.9 | 28.5 min |
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
How does Census Tract 39.04 compare with the other tracts in Mercer County?
Among Mercer County's tracts with a reliable estimate, Census Tract 39.04 ranks as shown below (1 = highest).
| Measure | In Mercer County |
|---|---|
| Population | 19th of 84 |
| Residents per square mile | 72nd of 84 |
| Median household income | 17th of 81 |
| Per capita income | 19th of 83 |
| Median home value | 25th of 76 |
| Median gross rent | 59th of 76 |
| Poverty rate | 45th of 47 |
| Bachelor's degree or higher | 15th of 79 |
| Median age | 46th of 84 |
| Owner-occupied share | 8th of 81 |
The tracts next to it on Mercer County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 43.16 | 14th | $177,344±$40,374 · within the margin of this tract |
| Tract 38 | 15th | $171,250±$32,106 · within the margin of this tract |
| Tract 43.14 | 16th | $167,458±$41,042 · within the margin of this tract |
| Tract 39.04 | 17th | $164,554±$29,706 |
| Tract 33.01 | 18th | $156,926±$15,839 · within the margin of this tract |
| Tract 33.03 | 19th | $152,983±$23,296 · within the margin of this tract |
| Tract 44.08 | 20th | $151,191±$11,491 · within the margin of this tract |
"Within the margin": the two incomes differ by less than their combined 90% margins, so the survey cannot say which is higher and the ranks between them are not firm.
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · How ranks are computed
How reliable are the figures for Census Tract 39.04?
2 of the 18 figures for Census Tract 39.04 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.
A census tract's figures rest on a few hundred sampled households over five years, so its margins are wider than a city's. Two tracts differ only when the gap between them is larger than their combined 90% margin (the square root of the sum of the two squared margins). 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 · Check it at data.census.gov
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections