Census tract · Los Angeles County
Census Tract 4033.21, Los Angeles County, California
Census Tract 4033.21, GEOID 06037403321, in Los Angeles County, California, entirely within Diamond Bar. 4,927 residents in the ACS 2020-2024 5-year estimates (±594); the 2020 Census counted 5,275.
Residents, 2020-2024
4,927
±594 (90% margin)
2020 Census count: 5,275
Median household income
$117,222
±$22,980 (90% margin)
Los Angeles County: $90,112
Median home value
$891,500
±$25,766 (90% margin)
Los Angeles County: $834,200
Median gross rent
$2,173
±$510 (90% margin)
Los Angeles County: $1,954
Where is Census Tract 4033.21?
Census Tract 4033.21 is one of 2,498 census tracts in Los Angeles County, California. It covers 2.46 square miles of land, 2,147 residents per square mile in 2020. Its GEOID, 06037403321, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Diamond Bar | 100% |
7 census tracts border Census Tract 4033.21: Tract 4033.16 ($93,151), Tract 4033.17 ($126,083), Tract 4033.19 ($93,211), Tract 4033.20 ($126,059), Tract 1.03 in San Bernardino County ($121,875), Tract 1.04 in San Bernardino County ($130,938) and Tract 1.18 in San Bernardino County ($140,350). 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 4033.21?
The 2020-2024 American Community Survey puts Census Tract 4033.21's population at 4,927 (±594) in 1,738 households; the 2020 Census counted 5,275 residents and 1,746 housing units.
| Measure | Tract 4033.21 | Diamond Bar |
|---|---|---|
| Total population | 4,927±594 | 53,355 |
| Households | 1,738±181 | 18,005 |
| Average household size | 2.82±0.20 | 2.95 |
| Housing units | 1,789±181 | 18,969 |
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 4033.21?
The median resident of Census Tract 4033.21 is 47.1 years old; 17.0% are under 18 and 23.4% are 65 or older. The largest group is non-Hispanic Asian residents at 54.7%, then Hispanic or Latino residents (of any race) at 23.5%. 39.3% of residents were born outside the United States.
| Measure | Tract 4033.21 | Diamond Bar |
|---|---|---|
| Median age | 47.1±2.7 | 45.7 |
| Under 18 years | 17.0%±3.4 pts | 19.0% |
| 65 years and over | 23.4%±4.1 pts | 21.0% |
| Hispanic or Latino (any race) | 23.5%±7.5 pts | 17.4% |
| White alone, not Hispanic | 17.1%±5.5 pts | 11.8% |
| Black or African American alone, not Hispanic | 2.6%±2.3 pts | 3.0% |
| Asian alone, not Hispanic | 54.7%±8.7 pts | 62.4% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±0.9 pts | 0.5% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.9 pts | 0.3% |
| Two or more races, not Hispanic | 2.2%±1.9 pts | 4.0% |
| Some other race alone, not Hispanic | 0.0%±0.9 pts | 0.5% |
| Born outside the United States | 39.3%±6.5 pts | 47.3% |
| Speak a language other than English at home (age 5+) | 56.7%±7.5 pts | 63.3% |
| Civilian veterans (age 18+) | 1.9%±1.2 pts | 2.5% |
| With a disability | 9.6%±3.2 pts | 9.0% |
| No health insurance coverage | 4.7%±2.1 pts | 3.4% |
| High school graduate or higher (age 25+) | 94.2%±2.8 pts | 92.1% |
| Bachelor's degree or higher (age 25+) | 50.2%±8.2 pts | 52.8% |
| Graduate or professional degree (age 25+) | 22.9%±7.7 pts | 19.2% |
| Lived in the same house a year earlier | 94.4%±2.8 pts | 92.7% |
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 4033.21 earn?
Half of the 1,738 households in Census Tract 4033.21 earn less than $117,222 a year (±$22,980), against $90,112 across Los Angeles County: 588th highest of the county's 2,422 tracts with a reliable estimate. 14.7% of residents live below the poverty line.
| Measure | Tract 4033.21 | Diamond Bar |
|---|---|---|
| Median household income | $117,222±$22,980 | $108,281 |
| Mean household income | $128,502±$15,592 | $138,466 |
| Per capita income | $46,210±$6,321 | $47,945 |
| People below the poverty line | 14.7%±6.6 pts | 10.0% |
| Children under 18 below the poverty line | 16.6%±21.6 pts | 13.6% |
| Households receiving SNAP | 15.0%±7.8 pts | 8.0% |
| Households with a computer | 95.8%±4.4 pts | 98.6% |
| Households with a broadband subscription | 92.7%±6.2 pts | 96.0% |
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 4033.21?
Owners occupy 80.8% of Census Tract 4033.21's occupied homes and renters 19.2%. The median owner-occupied home is valued at $891,500 by its owner (±$25,766). The median renter pays $2,173 a month including utilities, and 81.1% of renters pay 35% or more of their income on rent.
| Measure | Tract 4033.21 | Diamond Bar |
|---|---|---|
| Median home value (owner-occupied) | $891,500±$25,766 | $902,200 |
| Median gross rent | $2,173±$510 | $2,521 |
| Renters paying 35% or more of income on rent | 81.1%±16.6 pts | 57.4% |
| Median monthly owner costs, with a mortgage | $3,101±$214 | $3,149 |
| Owner-occupied homes | 80.8%±6.9 pts | 77.3% |
| Renter-occupied homes | 19.2%±6.9 pts | 22.7% |
| Housing units | 1,789±181 | 18,969 |
| Single-family detached homes | 88.1%±6.2 pts | 69.7% |
| Mobile homes | 1.1%±1.7 pts | 1.9% |
| Built 2020 or later | 0.0%±2.3 pts | 0.1% |
| Built 2010 to 2019 | 0.0%±2.3 pts | 1.4% |
| Built 1939 or earlier | 0.5%±1.0 pts | 0.6% |
| Households with no vehicle | 6.9%±6.4 pts | 2.4% |
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 4033.21 get to work?
79.4% of Census Tract 4033.21's workers drive alone and 16.5% work from home. The average trip to work takes 32.8 minutes.
| Measure | Tract 4033.21 | Diamond Bar |
|---|---|---|
| In the labor force (age 16+) | 60.4%±4.7 pts | 61.1% |
| Unemployment rate | 5.2%±3.6 pts | 4.9% |
| Drove alone to work | 79.4%±6.7 pts | 69.9% |
| Carpooled | 2.4%±2.2 pts | 9.3% |
| Public transportation | 0.6%±1.0 pts | 1.0% |
| Walked | 0.0%±1.8 pts | 0.4% |
| Worked from home | 16.5%±6.1 pts | 18.4% |
| Mean travel time to work | 32.8 min±2.2 | 33.3 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 4033.21 compare with the other tracts in Los Angeles County?
Among Los Angeles County's tracts with a reliable estimate, Census Tract 4033.21 ranks as shown below (1 = highest).
| Measure | In Los Angeles County | In Diamond Bar |
|---|---|---|
| Population | 573rd of 2,470 | 6th of 10 |
| Residents per square mile | 2,319th of 2,495 | 8th of 10 |
| Median household income | 588th of 2,422 | 4th of 10 |
| Per capita income | 947th of 2,468 | 4th of 10 |
| Median home value | 818th of 2,319 | 5th of 10 |
| Median gross rent | 889th of 2,396 | 9th of 10 |
| Poverty rate | 901st of 1,890 | 1st of 6 |
| Bachelor's degree or higher | 687th of 2,410 | 7th of 10 |
| Median age | 283rd of 2,473 | 4th of 10 |
| Owner-occupied share | 322nd of 2,272 | 2nd of 10 |
The tracts next to it on Los Angeles County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 9203.29 | 585th | $117,391±$27,971 · within the margin of this tract |
| Tract 2753.13 | 586th | $117,341±$29,407 · within the margin of this tract |
| Tract 3109 | 587th | $117,292±$37,724 · within the margin of this tract |
| Tract 4033.21 | 588th | $117,222±$22,980 |
| Tract 9203.22 | 589th | $117,150±$33,995 · within the margin of this tract |
| Tract 5545.18 | 590th | $117,120±$20,906 · within the margin of this tract |
| Tract 4807.04 | 591st | $117,065±$18,585 · 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 4033.21?
1 of the 18 figures for Census Tract 4033.21 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