Census tract · Mercer County
Census Tract 21, Mercer County, New Jersey
Census Tract 21, GEOID 34021002100, in Mercer County, New Jersey, entirely within Trenton. 6,310 residents in the ACS 2020-2024 5-year estimates (±1,464); the 2020 Census counted 5,670.
Residents, 2020-2024
6,310
±1,464 (90% margin)
2020 Census count: 5,670
Median household income
$28,720
±$16,064 (90% margin)
Mercer County: $100,645
Median home value
not published
Mercer County: $377,700
Median gross rent
$1,174
±$142 (90% margin)
Mercer County: $1,623
Where is Census Tract 21?
Census Tract 21 is one of 84 census tracts in Mercer County, New Jersey. It covers 0.36 square miles of land, 15,706 residents per square mile in 2020. Its GEOID, 34021002100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Trenton | 100% |
7 census tracts border Census Tract 21: Tract 5 ($52,679), Tract 6 ($69,950), Tract 7 ($61,318), Tract 8 ($78,785), Tract 9 ($79,260), Tract 20 ($39,734) and Tract 22 ($83,443). 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 21?
The 2020-2024 American Community Survey puts Census Tract 21's population at 6,310 (±1,464) in 1,941 households; the 2020 Census counted 5,670 residents and 2,344 housing units.
| Measure | Tract 21 | Trenton |
|---|---|---|
| Total population | 6,310 ±1,464 | 90,338 |
| Households | 1,941 ±244 | 32,052 |
| Average household size | 3.24 ±0.62 | 2.74 |
| Housing units | 2,022 ±216 | 34,513 |
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 21?
The median resident of Census Tract 21 is 30.8 years old; 30.4% are under 18 and 8.1% are 65 or older. The largest group is Hispanic or Latino residents (of any race) at 56.4%, then non-Hispanic Black residents at 33.6%. 36.1% of residents were born outside the United States.
| Measure | Tract 21 | Trenton |
|---|---|---|
| Median age | 30.8 ±5.4 | 34.8 |
| Under 18 years | 30.4% ±6.3 pts | 27.8% |
| 65 years and over | 8.1% ±3.5 pts | 12.0% |
| Hispanic or Latino (any race) | 56.4% ±12.0 pts | 46.4% |
| White alone, not Hispanic | 4.7% ±2.9 pts | 10.6% |
| Black or African American alone, not Hispanic | 33.6% ±11.1 pts | 40.0% |
| Asian alone, not Hispanic | 0.0% ±0.7 pts | 0.4% |
| American Indian and Alaska Native alone, not Hispanic | 0.2% ±0.4 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.7 pts | 0.0% |
| Two or more races, not Hispanic | 5.1% ±4.9 pts | 2.4% |
| Some other race alone, not Hispanic | 0.0% ±0.7 pts | 0.2% |
| Born outside the United States | 36.1% ±8.5 pts | 30.9% |
| Speak a language other than English at home (age 5+) | 55.0% ±12.3 pts | 45.9% |
| Civilian veterans (age 18+) | 3.7% ±3.3 pts | 4.3% |
| With a disability | 15.0% ±6.6 pts | 14.4% |
| No health insurance coverage | 38.6% ±8.1 pts | 17.6% |
| High school graduate or higher (age 25+) | 60.9% ±12.0 pts | 74.6% |
| Bachelor's degree or higher (age 25+) | 9.8% ±6.2 pts | 16.2% |
| Graduate or professional degree (age 25+) | 1.1% ±1.4 pts | 4.9% |
| Lived in the same house a year earlier | 87.7% ±6.1 pts | 88.0% |
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 21 earn?
Half of the 1,941 households in Census Tract 21 earn less than $28,720 a year (±$16,064), against $100,645 across Mercer County: 80th highest of the county's 81 tracts with a reliable estimate. 23.5% of residents live below the poverty line.
| Measure | Tract 21 | Trenton |
|---|---|---|
| Median household income | $28,720 ±$16,064 | $52,537 |
| Mean household income | $56,435 ±$13,606 | $77,515 |
| Per capita income | $18,368 ±$3,223 | $28,236 |
| People below the poverty line | 23.5% ±9.6 pts | 21.6% |
| Children under 18 below the poverty line | 11.4% ±11.3 pts | 26.3% |
| Households receiving SNAP | 41.5% ±11.8 pts | 25.9% |
| Households with a computer | 85.1% ±8.9 pts | 90.4% |
| Households with a broadband subscription | 71.4% ±10.5 pts | 82.0% |
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 21?
Owners occupy 22.7% of Census Tract 21's occupied homes and renters 77.3%. The median renter pays $1,174 a month including utilities, and 54.5% of renters pay 35% or more of their income on rent.
| Measure | Tract 21 | Trenton |
|---|---|---|
| Median gross rent | $1,174 ±$142 | $1,294 |
| Renters paying 35% or more of income on rent | 54.5% ±15.5 pts | 47.9% |
| Median monthly owner costs, with a mortgage | $916 ±$786 | $1,717 |
| Owner-occupied homes | 22.7% ±9.4 pts | 37.9% |
| Renter-occupied homes | 77.3% ±9.4 pts | 62.1% |
| Housing units | 2,022 ±216 | 34,513 |
| Single-family detached homes | 3.3% ±3.5 pts | 16.2% |
| Mobile homes | 0.0% ±2.2 pts | 0.2% |
| Built 2020 or later | 0.0% ±2.2 pts | 0.7% |
| Built 2010 to 2019 | 2.2% ±2.6 pts | 4.0% |
| Built 1939 or earlier | 31.8% ±13.1 pts | 38.1% |
| Households with no vehicle | 30.9% ±9.6 pts | 26.7% |
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 21 get to work?
67.0% of Census Tract 21's workers drive alone. The average trip to work takes 23.0 minutes. The unemployment rate in 2020-2024 averaged 14.3%.
| Measure | Tract 21 | Trenton |
|---|---|---|
| In the labor force (age 16+) | 67.9% ±7.9 pts | 61.4% |
| Unemployment rate | 14.3% ±8.3 pts | 10.1% |
| Drove alone to work | 67.0% ±17.9 pts | 57.7% |
| Carpooled | 20.2% ±15.4 pts | 15.8% |
| Public transportation | 4.8% ±5.3 pts | 6.6% |
| Walked | 4.7% ±6.8 pts | 3.9% |
| Worked from home | 0.4% ±0.6 pts | 7.1% |
| Mean travel time to work | 23.0 min ±3.9 | 26.9 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 21 compare with the other tracts in Mercer County?
Among Mercer County's tracts with a reliable estimate, Census Tract 21 ranks as shown below (1 = highest).
| Measure | In Mercer County | In Trenton |
|---|---|---|
| Population | 15th of 84 | 2nd of 25 |
| Residents per square mile | 8th of 84 | 8th of 25 |
| Median household income | 80th of 81 | 22nd of 23 |
| Per capita income | 79th of 83 | 20th of 24 |
| Median gross rent | 70th of 76 | 16th of 22 |
| Poverty rate | 11th of 47 | 10th of 18 |
| Bachelor's degree or higher | 75th of 79 | 17th of 20 |
| Median age | 73rd of 84 | 20th of 25 |
| Owner-occupied share | 79th of 81 | 20th of 22 |
The tracts next to it on Mercer County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 16 | 77th | $36,190±$15,493 · within the margin of this tract |
| Tract 11.01 | 78th | $35,015±$11,508 · within the margin of this tract |
| Tract 11.02 | 79th | $33,035±$8,429 · within the margin of this tract |
| Tract 21 | 80th | $28,720±$16,064 |
| Tract 10 | 81st | $24,659±$8,206 · 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 21?
2 of the 17 figures for Census Tract 21 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