Census tract · Union County
Census Tract 366, Union County, New Jersey
Census Tract 366, GEOID 34039036600, in Union County, New Jersey, entirely within Westfield. 4,265 residents in the ACS 2020-2024 5-year estimates (±578); the 2020 Census counted 4,100.
Residents, 2020-2024
4,265
±578 (90% margin)
2020 Census count: 4,100
Median household income
$141,726
±$58,358 (90% margin)
Union County: $103,202
Median home value
$722,500
±$61,590 (90% margin)
Union County: $529,200
Median gross rent
$2,442
±$288 (90% margin)
Union County: $1,730
Where is Census Tract 366?
Census Tract 366 is one of 120 census tracts in Union County, New Jersey. It covers 0.89 square miles of land, 4,596 residents per square mile in 2020. Its GEOID, 34039036600, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Westfield | 100% |
6 census tracts border Census Tract 366: Tract 364 ($250,000 or more), Tract 365 ($250,000 or more), Tract 367 ($196,375), Tract 369 ($110,670), Tract 385 ($185,504) and Tract 386.01 ($144,716). 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 366?
The 2020-2024 American Community Survey puts Census Tract 366's population at 4,265 (±578) in 1,771 households; the 2020 Census counted 4,100 residents and 1,815 housing units.
| Measure | Tract 366 | Westfield |
|---|---|---|
| Total population | 4,265 ±578 | 31,111 |
| Households | 1,771 ±267 | 10,900 |
| Average household size | 2.40 ±0.26 | 2.84 |
| Housing units | 1,858 ±284 | 11,192 |
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 366?
The median resident of Census Tract 366 is 37.9 years old; 24.5% are under 18 and 12.9% are 65 or older. The largest group is non-Hispanic white residents at 64.5%, then non-Hispanic Asian residents at 11.6%. 22.6% of residents were born outside the United States.
| Measure | Tract 366 | Westfield |
|---|---|---|
| Median age | 37.9 ±3.9 | 40.7 |
| Under 18 years | 24.5% ±4.8 pts | 28.7% |
| 65 years and over | 12.9% ±3.1 pts | 14.9% |
| Hispanic or Latino (any race) | 9.7% ±5.0 pts | 8.0% |
| White alone, not Hispanic | 64.5% ±9.2 pts | 76.5% |
| Black or African American alone, not Hispanic | 6.6% ±4.6 pts | 2.4% |
| Asian alone, not Hispanic | 11.6% ±5.5 pts | 8.8% |
| American Indian and Alaska Native alone, not Hispanic | 0.2% ±0.3 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±1.0 pts | 0.0% |
| Two or more races, not Hispanic | 7.4% ±4.5 pts | 3.2% |
| Some other race alone, not Hispanic | 0.0% ±1.0 pts | 1.1% |
| Born outside the United States | 22.6% ±6.8 pts | 13.6% |
| Speak a language other than English at home (age 5+) | 25.1% ±8.8 pts | 19.6% |
| Civilian veterans (age 18+) | 2.3% ±1.5 pts | 2.6% |
| With a disability | 6.3% ±2.4 pts | 5.4% |
| No health insurance coverage | 4.4% ±3.9 pts | 2.7% |
| High school graduate or higher (age 25+) | 93.7% ±5.7 pts | 97.8% |
| Bachelor's degree or higher (age 25+) | 67.2% ±7.9 pts | 78.1% |
| Graduate or professional degree (age 25+) | 19.8% ±5.2 pts | 38.2% |
| Lived in the same house a year earlier | 90.1% ±4.2 pts | 93.1% |
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 366 earn?
Half of the 1,771 households in Census Tract 366 earn less than $141,726 a year (±$58,358), against $103,202 across Union County: 29th highest of the county's 118 tracts with a reliable estimate.
| Measure | Tract 366 | Westfield |
|---|---|---|
| Median household income | $141,726 ±$58,358 | $232,629 |
| Mean household income | $227,167 ±$34,435 | $306,889 |
| Per capita income | $90,315 ±$12,912 | $107,640 |
| People below the poverty line | 5.4% ±4.3 pts | 1.8% |
| Children under 18 below the poverty line | 6.8% ±10.2 pts | 0.8% |
| Households receiving SNAP | 3.3% ±2.6 pts | 1.6% |
| Households with a computer | 97.4% ±3.4 pts | 98.4% |
| Households with a broadband subscription | 96.8% ±3.4 pts | 97.6% |
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 366?
Owners occupy 52.1% of Census Tract 366's occupied homes and renters 47.9%. The median owner-occupied home is valued at $722,500 by its owner (±$61,590). The median renter pays $2,442 a month including utilities, and 19.6% of renters pay 35% or more of their income on rent.
| Measure | Tract 366 | Westfield |
|---|---|---|
| Median home value (owner-occupied) | $722,500 ±$61,590 | $953,400 |
| Median gross rent | $2,442 ±$288 | $2,357 |
| Renters paying 35% or more of income on rent | 19.6% ±11.9 pts | 28.6% |
| Median monthly owner costs, with a mortgage | $3,996 ±$452 | $4,000 or more |
| Owner-occupied homes | 52.1% ±9.4 pts | 81.1% |
| Renter-occupied homes | 47.9% ±9.4 pts | 18.9% |
| Housing units | 1,858 ±284 | 11,192 |
| Single-family detached homes | 39.7% ±8.0 pts | 78.1% |
| Mobile homes | 0.0% ±2.4 pts | 0.2% |
| Built 2020 or later | 0.4% ±0.8 pts | 1.2% |
| Built 2010 to 2019 | 7.5% ±3.5 pts | 5.9% |
| Built 1939 or earlier | 55.6% ±8.9 pts | 37.3% |
| Households with no vehicle | 2.6% ±1.8 pts | 3.1% |
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 366 get to work?
47.8% of Census Tract 366's workers drive alone and 31.9% work from home. The average trip to work takes 36.2 minutes. The unemployment rate in 2020-2024 averaged 7.9%.
| Measure | Tract 366 | Westfield |
|---|---|---|
| In the labor force (age 16+) | 74.1% ±6.3 pts | 67.9% |
| Unemployment rate | 7.9% ±4.4 pts | 3.6% |
| Drove alone to work | 47.8% ±9.0 pts | 49.7% |
| Carpooled | 3.0% ±2.3 pts | 2.1% |
| Public transportation | 13.4% ±5.8 pts | 11.8% |
| Walked | 2.1% ±1.5 pts | 1.0% |
| Worked from home | 31.9% ±9.6 pts | 34.3% |
| Mean travel time to work | 36.2 min ±5.8 | 36.7 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 366 compare with the other tracts in Union County?
Among Union County's tracts with a reliable estimate, Census Tract 366 ranks as shown below (1 = highest).
| Measure | In Union County | In Westfield |
|---|---|---|
| Population | 76th of 120 | 5th of 5 |
| Residents per square mile | 90th of 120 | 2nd of 5 |
| Median household income | 29th of 118 | 5th of 5 |
| Per capita income | 12th of 119 | 5th of 5 |
| Median home value | 17th of 115 | 5th of 5 |
| Median gross rent | 14th of 113 | 3rd of 5 |
| Bachelor's degree or higher | 18th of 114 | 5th of 5 |
| Median age | 76th of 120 | 5th of 5 |
| Owner-occupied share | 69th of 115 | 5th of 5 |
The tracts next to it on Union County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 330 | 26th | $149,152±$32,949 · within the margin of this tract |
| Tract 334 | 27th | $148,650±$45,976 · within the margin of this tract |
| Tract 386.01 | 28th | $144,716±$28,245 · within the margin of this tract |
| Tract 366 | 29th | $141,726±$58,358 |
| Tract 321.02 | 30th | $140,682±$13,775 · within the margin of this tract |
| Tract 362 | 31st | $138,654±$16,278 · within the margin of this tract |
| Tract 370 | 32nd | $138,421±$52,478 · 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 366?
2 of the 18 figures for Census Tract 366 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