Census tract · Mercer County
Census Tract 45.01, Mercer County, New Jersey
Census Tract 45.01, GEOID 34021004501, in Mercer County, New Jersey, entirely within Princeton. 6,678 residents in the ACS 2020-2024 5-year estimates (±345); the 2020 Census counted 6,474.
Residents, 2020-2024
6,678
±345 (90% margin)
2020 Census count: 6,474
Median household income
$197,434
±$49,316 (90% margin)
Mercer County: $100,645
Median home value
$1,130,900
±$55,374 (90% margin)
Mercer County: $377,700
Median gross rent
$2,449
±$383 (90% margin)
Mercer County: $1,623
Where is Census Tract 45.01?
Census Tract 45.01 is one of 84 census tracts in Mercer County, New Jersey. It covers 0.61 square miles of land, 10,613 residents per square mile in 2020. Its GEOID, 34021004501, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Princeton | 100% |
3 census tracts border Census Tract 45.01: Tract 40 ($110,375), Tract 42.04 ($207,207) and Tract 45.02. 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 45.01?
The 2020-2024 American Community Survey puts Census Tract 45.01's population at 6,678 (±345) in 681 households; the 2020 Census counted 6,474 residents and 831 housing units.
| Measure | Tract 45.01 | Princeton |
|---|---|---|
| Total population | 6,678 ±345 | 30,756 |
| Households | 681 ±122 | 9,300 |
| Average household size | 2.29 ±0.19 | 2.54 |
| Housing units | 848 ±149 | 9,906 |
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 45.01?
The median resident of Census Tract 45.01 is 21.0 years old; 3.6% are under 18 and 6.4% are 65 or older. The largest group is non-Hispanic white residents at 50.7%, then non-Hispanic Asian residents at 22.5%. 23.5% of residents were born outside the United States.
| Measure | Tract 45.01 | Princeton |
|---|---|---|
| Median age | 21.0 ±0.3 | 28.5 |
| Under 18 years | 3.6% ±1.0 pts | 18.8% |
| 65 years and over | 6.4% ±2.7 pts | 13.0% |
| Hispanic or Latino (any race) | 11.1% ±2.2 pts | 8.0% |
| White alone, not Hispanic | 50.7% ±4.0 pts | 57.8% |
| Black or African American alone, not Hispanic | 7.4% ±1.8 pts | 6.1% |
| Asian alone, not Hispanic | 22.5% ±2.9 pts | 21.5% |
| American Indian and Alaska Native alone, not Hispanic | 0.7% ±0.8 pts | 0.3% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.7 pts | 0.0% |
| Two or more races, not Hispanic | 7.6% ±1.7 pts | 5.4% |
| Some other race alone, not Hispanic | 0.1% ±0.3 pts | 0.8% |
| Born outside the United States | 23.5% ±2.7 pts | 30.9% |
| Speak a language other than English at home (age 5+) | 34.5% ±4.0 pts | 35.2% |
| Civilian veterans (age 18+) | 1.0% ±0.7 pts | 1.6% |
| With a disability | 4.8% ±1.6 pts | 6.6% |
| No health insurance coverage | 3.0% ±1.3 pts | 1.8% |
| High school graduate or higher (age 25+) | 100.0% ±2.6 pts | 97.7% |
| Bachelor's degree or higher (age 25+) | 86.9% ±5.4 pts | 84.7% |
| Graduate or professional degree (age 25+) | 58.7% ±8.6 pts | 56.8% |
| Lived in the same house a year earlier | 61.3% ±3.8 pts | 77.0% |
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 45.01 earn?
Half of the 681 households in Census Tract 45.01 earn less than $197,434 a year (±$49,316), against $100,645 across Mercer County: 11th highest of the county's 81 tracts with a reliable estimate.
| Measure | Tract 45.01 | Princeton |
|---|---|---|
| Median household income | $197,434 ±$49,316 | $192,079 |
| Mean household income | $257,508 ±$36,683 | $275,137 |
| Per capita income | $38,260 ±$5,528 | $87,301 |
| People below the poverty line | 6.5% ±4.9 pts | 6.1% |
| Children under 18 below the poverty line | 0.0% ±18.2 pts | 3.7% |
| Households receiving SNAP | 1.0% ±1.3 pts | 2.0% |
| Households with a computer | 100.0% ±6.4 pts | 99.4% |
| Households with a broadband subscription | 95.6% ±3.0 pts | 93.4% |
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 Census Tract 45.01?
Owners occupy 49.9% of Census Tract 45.01's occupied homes and renters 50.1%. The median owner-occupied home is valued at $1,130,900 by its owner (±$55,374). The median renter pays $2,449 a month including utilities, and 24.9% of renters pay 35% or more of their income on rent.
| Measure | Tract 45.01 | Princeton |
|---|---|---|
| Median home value (owner-occupied) | $1,130,900 ±$55,374 | $1,050,600 |
| Median gross rent | $2,449 ±$383 | $2,636 |
| Renters paying 35% or more of income on rent | 24.9% ±12.7 pts | 30.7% |
| Median monthly owner costs, with a mortgage | $4,000 or more | $4,000 or more |
| Owner-occupied homes | 49.9% ±8.8 pts | 55.4% |
| Renter-occupied homes | 50.1% ±8.8 pts | 44.6% |
| Housing units | 848 ±149 | 9,906 |
| Single-family detached homes | 38.0% ±7.8 pts | 54.2% |
| Mobile homes | 0.0% ±5.2 pts | 0.0% |
| Built 2020 or later | 3.1% ±2.8 pts | 2.7% |
| Built 2010 to 2019 | 3.3% ±2.5 pts | 9.8% |
| Built 1939 or earlier | 46.8% ±10.5 pts | 23.3% |
| Households with no vehicle | 13.7% ±6.2 pts | 11.9% |
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 45.01 get to work?
18.4% of Census Tract 45.01's workers drive alone and 25.5% work from home. The average trip to work takes 15.4 minutes. The unemployment rate in 2020-2024 averaged 7.4%.
| Measure | Tract 45.01 | Princeton |
|---|---|---|
| In the labor force (age 16+) | 54.1% ±3.2 pts | 63.3% |
| Unemployment rate | 7.4% ±2.8 pts | 4.3% |
| Drove alone to work | 18.4% ±4.3 pts | 32.1% |
| Carpooled | 1.3% ±1.2 pts | 2.1% |
| Public transportation | 5.0% ±2.2 pts | 7.7% |
| Walked | 43.5% ±5.4 pts | 19.9% |
| Worked from home | 25.5% ±4.4 pts | 32.7% |
| Mean travel time to work | 15.4 min ±2.6 | 24.2 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 45.01 compare with the other tracts in Mercer County?
Among Mercer County's tracts with a reliable estimate, Census Tract 45.01 ranks as shown below (1 = highest).
| Measure | In Mercer County | In Princeton |
|---|---|---|
| Population | 11th of 84 | 1st of 7 |
| Residents per square mile | 16th of 84 | 1st of 7 |
| Median household income | 11th of 81 | 4th of 6 |
| Per capita income | 51st of 83 | 7th of 7 |
| Median home value | 4th of 76 | 4th of 7 |
| Median gross rent | 8th of 76 | 4th of 6 |
| Bachelor's degree or higher | 5th of 79 | 2nd of 7 |
| Median age | 84th of 84 | 7th of 7 |
| Owner-occupied share | 58th of 81 | 5th of 7 |
The tracts next to it on Mercer County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 33.04 | 8th | $219,091±$69,924 · within the margin of this tract |
| Tract 42.04 | 9th | $207,207±$41,920 · within the margin of this tract |
| Tract 43.07 | 10th | $200,355±$17,729 · within the margin of this tract |
| Tract 45.01 | 11th | $197,434±$49,316 |
| Tract 39.03 | 12th | $192,586±$25,175 · within the margin of this tract |
| Tract 42.06 | 13th | $181,528±$64,204 · within the margin of this tract |
| Tract 43.16 | 14th | $177,344±$40,374 · 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 45.01?
1 of the 18 figures for Census Tract 45.01 on this page carries a coefficient of variation over 40% and is 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