Census tract · Los Angeles County
Census Tract 4310.03, Los Angeles County, California
Census Tract 4310.03, GEOID 06037431003, in Los Angeles County, California, entirely within Monrovia. 4,613 residents in the ACS 2020-2024 5-year estimates (±1,276); the 2020 Census counted 3,831.
Residents, 2020-2024
4,613
±1,276 (90% margin)
2020 Census count: 3,831
Median household income
$89,099
±$28,164 (90% margin)
Los Angeles County: $90,112
Median home value
$797,100
±$83,579 (90% margin)
Los Angeles County: $834,200
Median gross rent
$2,081
±$251 (90% margin)
Los Angeles County: $1,954
Where is Census Tract 4310.03?
Census Tract 4310.03 is one of 2,498 census tracts in Los Angeles County, California. It covers 0.33 square miles of land, 11,609 residents per square mile in 2020. Its GEOID, 06037431003, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Monrovia | 100% |
4 census tracts border Census Tract 4310.03: Tract 4303.02 ($103,512), Tract 4304 ($182,292), Tract 4309.01 ($85,560) and Tract 4310.04 ($84,833). 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 4310.03?
The 2020-2024 American Community Survey puts Census Tract 4310.03's population at 4,613 (±1,276) in 1,587 households; the 2020 Census counted 3,831 residents and 1,616 housing units.
| Measure | Tract 4310.03 | Monrovia |
|---|---|---|
| Total population | 4,613±1,276 | 37,571 |
| Households | 1,587±238 | 14,181 |
| Average household size | 2.91±0.45 | 2.63 |
| Housing units | 1,661±227 | 14,855 |
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 4310.03?
The median resident of Census Tract 4310.03 is 35.0 years old; 29.1% are under 18 and 8.4% are 65 or older. The largest group is Hispanic or Latino residents (of any race) at 55.9%, then non-Hispanic white residents at 18.7%. 29.4% of residents were born outside the United States.
| Measure | Tract 4310.03 | Monrovia |
|---|---|---|
| Median age | 35.0±3.7 | 38.3 |
| Under 18 years | 29.1%±10.2 pts | 21.7% |
| 65 years and over | 8.4%±3.4 pts | 14.7% |
| Hispanic or Latino (any race) | 55.9%±12.7 pts | 45.2% |
| White alone, not Hispanic | 18.7%±7.6 pts | 28.1% |
| Black or African American alone, not Hispanic | 8.5%±5.6 pts | 5.5% |
| Asian alone, not Hispanic | 12.5%±5.9 pts | 15.6% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±0.9 pts | 0.3% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.9 pts | 0.4% |
| Two or more races, not Hispanic | 3.5%±2.4 pts | 4.3% |
| Some other race alone, not Hispanic | 0.9%±1.3 pts | 0.6% |
| Born outside the United States | 29.4%±6.9 pts | 26.3% |
| Speak a language other than English at home (age 5+) | 49.9%±14.7 pts | 43.6% |
| Civilian veterans (age 18+) | 2.0%±1.9 pts | 3.0% |
| With a disability | 6.1%±3.0 pts | 9.3% |
| No health insurance coverage | 1.1%±1.0 pts | 4.9% |
| High school graduate or higher (age 25+) | 90.6%±7.7 pts | 88.8% |
| Bachelor's degree or higher (age 25+) | 43.2%±8.3 pts | 42.7% |
| Graduate or professional degree (age 25+) | 16.8%±6.8 pts | 16.7% |
| Lived in the same house a year earlier | 97.4%±2.0 pts | 90.5% |
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 4310.03 earn?
Half of the 1,587 households in Census Tract 4310.03 earn less than $89,099 a year (±$28,164), against $90,112 across Los Angeles County: 1,207th highest of the county's 2,422 tracts with a reliable estimate. 27.3% of residents live below the poverty line.
| Measure | Tract 4310.03 | Monrovia |
|---|---|---|
| Median household income | $89,099±$28,164 | $96,021 |
| Mean household income | $101,628±$16,253 | $127,219 |
| Per capita income | $35,473±$6,485 | $48,568 |
| People below the poverty line | 27.3%±17.0 pts | 10.3% |
| Children under 18 below the poverty line | 50.2%±28.6 pts | 14.2% |
| Households receiving SNAP | 9.6%±3.4 pts | 9.9% |
| Households with a computer | 98.5%±1.8 pts | 96.7% |
| Households with a broadband subscription | 98.5%±1.5 pts | 93.0% |
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 4310.03?
Owners occupy 30.4% of Census Tract 4310.03's occupied homes and renters 69.6%. The median owner-occupied home is valued at $797,100 by its owner (±$83,579). The median renter pays $2,081 a month including utilities, and 41.9% of renters pay 35% or more of their income on rent.
| Measure | Tract 4310.03 | Monrovia |
|---|---|---|
| Median home value (owner-occupied) | $797,100±$83,579 | $909,400 |
| Median gross rent | $2,081±$251 | $2,114 |
| Renters paying 35% or more of income on rent | 41.9%±17.9 pts | 43.4% |
| Median monthly owner costs, with a mortgage | $2,567±$419 | $3,134 |
| Owner-occupied homes | 30.4%±8.5 pts | 46.3% |
| Renter-occupied homes | 69.6%±8.5 pts | 53.7% |
| Housing units | 1,661±227 | 14,855 |
| Single-family detached homes | 40.2%±11.1 pts | 57.5% |
| Mobile homes | 0.0%±2.5 pts | 1.1% |
| Built 2020 or later | 0.4%±0.6 pts | 0.4% |
| Built 2010 to 2019 | 1.3%±1.2 pts | 4.9% |
| Built 1939 or earlier | 14.7%±7.1 pts | 16.7% |
| Households with no vehicle | 3.3%±2.5 pts | 4.7% |
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 4310.03 get to work?
62.5% of Census Tract 4310.03's workers drive alone and 15.0% work from home. The average trip to work takes 32.9 minutes.
| Measure | Tract 4310.03 | Monrovia |
|---|---|---|
| In the labor force (age 16+) | 61.3%±5.5 pts | 66.4% |
| Unemployment rate | 1.8%±1.6 pts | 5.1% |
| Drove alone to work | 62.5%±8.2 pts | 67.6% |
| Carpooled | 20.8%±9.0 pts | 8.6% |
| Public transportation | 0.4%±0.7 pts | 2.4% |
| Walked | 0.4%±0.9 pts | 1.8% |
| Worked from home | 15.0%±7.7 pts | 18.0% |
| Mean travel time to work | 32.9 min±3.9 | 30.1 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 4310.03 compare with the other tracts in Los Angeles County?
Among Los Angeles County's tracts with a reliable estimate, Census Tract 4310.03 ranks as shown below (1 = highest).
| Measure | In Los Angeles County | In Monrovia |
|---|---|---|
| Population | 732nd of 2,470 | 4th of 8 |
| Residents per square mile | 1,151st of 2,495 | 1st of 8 |
| Median household income | 1,207th of 2,422 | 4th of 8 |
| Per capita income | 1,355th of 2,468 | 8th of 8 |
| Median home value | 1,136th of 2,319 | 6th of 8 |
| Median gross rent | 1,025th of 2,396 | 4th of 8 |
| Poverty rate | 220th of 1,890 | 1st of 7 |
| Bachelor's degree or higher | 871st of 2,410 | 5th of 8 |
| Median age | 1,786th of 2,473 | 7th of 8 |
| Owner-occupied share | 1,656th of 2,272 | 7th of 8 |
The tracts next to it on Los Angeles County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 1436.06 | 1,204th | $89,176±$19,204 · within the margin of this tract |
| Tract 5545.15 | 1,205th | $89,161±$11,468 · within the margin of this tract |
| Tract 1920.01 | 1,206th | $89,102±$32,306 · within the margin of this tract |
| Tract 4310.03 | 1,207th | $89,099±$28,164 |
| Tract 9010.07 | 1,208th | $89,063±$24,528 · within the margin of this tract |
| Tract 4015 | 1,209th | $89,034±$10,870 · within the margin of this tract |
| Tract 2942 | 1,210th | $88,958±$18,575 · 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 4310.03?
1 of the 18 figures for Census Tract 4310.03 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