Census tract · Los Alamos County
Census Tract 4, Los Alamos County, New Mexico
Census Tract 4, GEOID 35028000400, in Los Alamos County, New Mexico, mostly within Los Alamos (72% of its census blocks). 4,346 residents in the ACS 2020-2024 5-year estimates (±441); the 2020 Census counted 3,907.
Residents, 2020-2024
4,346
±441 (90% margin)
2020 Census count: 3,907
Median household income
$104,028
±$13,495 (90% margin)
Los Alamos County: $147,139
Median home value
$363,800
±$46,075 (90% margin)
Los Alamos County: $495,800
Median gross rent
$1,141
±$260 (90% margin)
Los Alamos County: $1,375
Where is Census Tract 4?
Census Tract 4 is one of 4 census tracts in Los Alamos County, New Mexico. It covers 31.07 square miles of land, 126 residents per square mile in 2020. Its GEOID, 35028000400, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Los Alamos | 72% |
5 census tracts border Census Tract 4: Tract 1 ($155,556), Tract 2 ($161,867), Tract 5 ($156,639), Tract 9403 in Sandoval County and Tract 9403 in Santa Fe County ($69,063). 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 4?
The 2020-2024 American Community Survey puts Census Tract 4's population at 4,346 (±441) in 2,450 households; the 2020 Census counted 3,907 residents and 2,325 housing units.
| Measure | Tract 4 | Los Alamos |
|---|---|---|
| Total population | 4,346 ±441 | 13,317 |
| Households | 2,450 ±208 | 5,975 |
| Average household size | 1.74 ±0.13 | 2.21 |
| Housing units | 2,519 ±190 | 6,190 |
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 4?
The median resident of Census Tract 4 is 34.2 years old; 13.6% are under 18 and 16.6% are 65 or older. The largest group is non-Hispanic white residents at 55.4%, then Hispanic or Latino residents (of any race) at 24.3%. 19.4% of residents were born outside the United States.
| Measure | Tract 4 | Los Alamos |
|---|---|---|
| Median age | 34.2 ±2.4 | 38.8 |
| Under 18 years | 13.6% ±2.8 pts | 20.2% |
| 65 years and over | 16.6% ±3.4 pts | 17.4% |
| Hispanic or Latino (any race) | 24.3% ±5.8 pts | 17.9% |
| White alone, not Hispanic | 55.4% ±6.7 pts | 69.5% |
| Black or African American alone, not Hispanic | 3.5% ±2.6 pts | 0.8% |
| Asian alone, not Hispanic | 10.7% ±4.4 pts | 6.3% |
| American Indian and Alaska Native alone, not Hispanic | 1.2% ±1.3 pts | 0.5% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.4% ±0.6 pts | 0.1% |
| Two or more races, not Hispanic | 3.2% ±2.3 pts | 4.4% |
| Some other race alone, not Hispanic | 1.4% ±1.6 pts | 0.5% |
| Born outside the United States | 19.4% ±5.7 pts | 11.5% |
| Speak a language other than English at home (age 5+) | 24.7% ±6.0 pts | 18.3% |
| Civilian veterans (age 18+) | 6.4% ±3.1 pts | 6.0% |
| With a disability | 11.1% ±4.3 pts | 9.8% |
| No health insurance coverage | 5.3% ±3.2 pts | 3.4% |
| High school graduate or higher (age 25+) | 97.2% ±1.7 pts | 97.6% |
| Bachelor's degree or higher (age 25+) | 70.3% ±6.8 pts | 69.8% |
| Graduate or professional degree (age 25+) | 47.1% ±6.9 pts | 46.5% |
| Lived in the same house a year earlier | 70.1% ±7.7 pts | 85.5% |
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 4 earn?
Half of the 2,450 households in Census Tract 4 earn less than $104,028 a year (±$13,495), against $147,139 across Los Alamos County: 4th highest of the county's 4 tracts with a reliable estimate. 7.5% of residents live below the poverty line.
| Measure | Tract 4 | Los Alamos |
|---|---|---|
| Median household income | $104,028 ±$13,495 | $141,018 |
| Mean household income | $127,471 ±$14,633 | $164,414 |
| Per capita income | $72,613 ±$7,672 | $76,146 |
| People below the poverty line | 7.5% ±4.7 pts | 4.1% |
| Children under 18 below the poverty line | 19.3% ±15.5 pts | 6.0% |
| Households receiving SNAP | 5.2% ±3.9 pts | 4.8% |
| Households with a computer | 98.1% ±2.5 pts | 98.4% |
| Households with a broadband subscription | 91.8% ±4.4 pts | 94.5% |
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 4?
Owners occupy 45.4% of Census Tract 4's occupied homes and renters 54.6%. The median owner-occupied home is valued at $363,800 by its owner (±$46,075). The median renter pays $1,141 a month including utilities, and 22.3% of renters pay 35% or more of their income on rent.
| Measure | Tract 4 | Los Alamos |
|---|---|---|
| Median home value (owner-occupied) | $363,800 ±$46,075 | $501,800 |
| Median gross rent | $1,141 ±$260 | $1,359 |
| Renters paying 35% or more of income on rent | 22.3% ±9.9 pts | 18.8% |
| Median monthly owner costs, with a mortgage | $1,808 ±$411 | $2,274 |
| Owner-occupied homes | 45.4% ±7.8 pts | 66.5% |
| Renter-occupied homes | 54.6% ±7.8 pts | 33.5% |
| Housing units | 2,519 ±190 | 6,190 |
| Single-family detached homes | 26.1% ±6.6 pts | 51.3% |
| Mobile homes | 8.0% ±5.9 pts | 4.2% |
| Built 2020 or later | 9.8% ±6.9 pts | 1.8% |
| Built 2010 to 2019 | 3.3% ±2.4 pts | 5.4% |
| Built 1939 or earlier | 0.0% ±1.7 pts | 0.0% |
| Households with no vehicle | 4.9% ±3.3 pts | 2.8% |
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 4 get to work?
68.7% of Census Tract 4's workers drive alone and 12.2% work from home. The average trip to work takes 10.9 minutes.
| Measure | Tract 4 | Los Alamos |
|---|---|---|
| In the labor force (age 16+) | 73.4% ±4.7 pts | 68.6% |
| Unemployment rate | 0.5% ±0.7 pts | 0.8% |
| Drove alone to work | 68.7% ±6.5 pts | 70.5% |
| Carpooled | 5.0% ±5.0 pts | 5.6% |
| Public transportation | 2.4% ±2.5 pts | 1.4% |
| Walked | 7.2% ±4.2 pts | 3.2% |
| Worked from home | 12.2% ±5.3 pts | 16.8% |
| Mean travel time to work | 10.9 min ±1.4 | 12.4 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 4 compare with the other tracts in Los Alamos County?
Among Los Alamos County's tracts with a reliable estimate, Census Tract 4 ranks as shown below (1 = highest).
| Measure | In Los Alamos County | In Los Alamos |
|---|---|---|
| Population | 3rd of 4 | 2nd of 3 |
| Residents per square mile | 4th of 4 | 3rd of 3 |
| Median household income | 4th of 4 | 3rd of 3 |
| Per capita income | 2nd of 4 | 2nd of 3 |
| Median home value | 4th of 4 | 3rd of 3 |
| Median gross rent | 2nd of 3 | 2nd of 3 |
| Bachelor's degree or higher | 3rd of 4 | 2nd of 3 |
| Median age | 4th of 4 | 3rd of 3 |
| Owner-occupied share | 4th of 4 | 3rd of 3 |
The tracts next to it on Los Alamos County's income ladder
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 4?
1 of the 18 figures for Census Tract 4 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