Census tract · Middlesex County
Census Tract 3581, Middlesex County, Massachusetts
Census Tract 3581, GEOID 25017358100, in Middlesex County, Massachusetts, entirely within Lexington. 5,281 residents in the ACS 2020-2024 5-year estimates (±394); the 2020 Census counted 5,282.
Residents, 2020-2024
5,281
±394 (90% margin)
2020 Census count: 5,282
Median household income
$233,056
±$39,449 (90% margin)
Middlesex County: $130,847
Median home value
$1,112,900
±$87,096 (90% margin)
Middlesex County: $727,800
Median gross rent
$2,783
±$510 (90% margin)
Middlesex County: $2,201
Where is Census Tract 3581?
Census Tract 3581 is one of 357 census tracts in Middlesex County, Massachusetts. It covers 2.11 square miles of land, 2,506 residents per square mile in 2020. Its GEOID, 25017358100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Lexington | 100% |
6 census tracts border Census Tract 3581: Tract 3565 ($149,844), Tract 3577 ($138,958), Tract 3578 ($235,063), Tract 3583 ($250,000 or more), Tract 3584 ($184,299) and Tract 3585 ($250,000 or more). 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 3581?
The 2020-2024 American Community Survey puts Census Tract 3581's population at 5,281 (±394) in 1,900 households; the 2020 Census counted 5,282 residents and 1,887 housing units.
| Measure | Tract 3581 | Lexington |
|---|---|---|
| Total population | 5,281±394 | 34,295 |
| Households | 1,900±143 | 12,477 |
| Average household size | 2.75±0.13 | 2.72 |
| Housing units | 1,982±163 | 12,754 |
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 3581?
The median resident of Census Tract 3581 is 44.8 years old; 26.3% are under 18 and 17.4% are 65 or older. The largest group is non-Hispanic white residents at 57.4%, then non-Hispanic Asian residents at 31.9%. 33.2% of residents were born outside the United States.
| Measure | Tract 3581 | Lexington |
|---|---|---|
| Median age | 44.8±3.7 | 47.3 |
| Under 18 years | 26.3%±2.2 pts | 25.5% |
| 65 years and over | 17.4%±2.5 pts | 21.7% |
| Hispanic or Latino (any race) | 1.0%±0.9 pts | 3.5% |
| White alone, not Hispanic | 57.4%±6.3 pts | 55.2% |
| Black or African American alone, not Hispanic | 0.5%±0.5 pts | 1.7% |
| Asian alone, not Hispanic | 31.9%±5.6 pts | 33.8% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±0.8 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.8 pts | 0.0% |
| Two or more races, not Hispanic | 7.8%±4.3 pts | 4.9% |
| Some other race alone, not Hispanic | 1.4%±1.9 pts | 0.9% |
| Born outside the United States | 33.2%±4.3 pts | 34.4% |
| Speak a language other than English at home (age 5+) | 43.4%±6.0 pts | 40.3% |
| Civilian veterans (age 18+) | 2.7%±1.8 pts | 3.7% |
| With a disability | 3.4%±1.6 pts | 6.8% |
| No health insurance coverage | 2.3%±1.5 pts | 1.0% |
| High school graduate or higher (age 25+) | 98.0%±1.6 pts | 96.9% |
| Bachelor's degree or higher (age 25+) | 83.0%±3.6 pts | 84.3% |
| Graduate or professional degree (age 25+) | 61.8%±4.7 pts | 58.6% |
| Lived in the same house a year earlier | 89.6%±4.8 pts | 88.9% |
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 3581 earn?
Half of the 1,900 households in Census Tract 3581 earn less than $233,056 a year (±$39,449), against $130,847 across Middlesex County: 23rd highest of the county's 350 tracts with a reliable estimate.
| Measure | Tract 3581 | Lexington |
|---|---|---|
| Median household income | $233,056±$39,449 | $238,444 |
| Mean household income | $290,130±$29,611 | $311,976 |
| Per capita income | $106,263±$9,713 | $114,758 |
| People below the poverty line | 1.8%±1.3 pts | 4.7% |
| Children under 18 below the poverty line | 0.7%±1.2 pts | 4.3% |
| Households receiving SNAP | 2.5%±1.9 pts | 4.2% |
| Households with a computer | 98.9%±1.2 pts | 98.6% |
| Households with a broadband subscription | 99.1%±1.1 pts | 98.2% |
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 3581?
Owners occupy 86.4% of Census Tract 3581's occupied homes and renters 13.6%. The median owner-occupied home is valued at $1,112,900 by its owner (±$87,096). The median renter pays $2,783 a month including utilities, and 23.9% of renters pay 35% or more of their income on rent.
| Measure | Tract 3581 | Lexington |
|---|---|---|
| Median home value (owner-occupied) | $1,112,900±$87,096 | $1,203,100 |
| Median gross rent | $2,783±$510 | $2,891 |
| Renters paying 35% or more of income on rent | 23.9%±14.9 pts | 44.5% |
| Median monthly owner costs, with a mortgage | $4,000 or more | $4,000 or more |
| Owner-occupied homes | 86.4%±4.4 pts | 80.5% |
| Renter-occupied homes | 13.6%±4.4 pts | 19.5% |
| Housing units | 1,982±163 | 12,754 |
| Single-family detached homes | 78.2%±5.7 pts | 73.7% |
| Mobile homes | 0.0%±2.1 pts | 0.0% |
| Built 2020 or later | 3.6%±4.4 pts | 2.7% |
| Built 2010 to 2019 | 4.3%±2.7 pts | 9.9% |
| Built 1939 or earlier | 27.3%±6.3 pts | 21.2% |
| Households with no vehicle | 1.7%±2.6 pts | 4.4% |
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 3581 get to work?
50.4% of Census Tract 3581's workers drive alone and 37.8% work from home. The average trip to work takes 31.5 minutes. The unemployment rate in 2020-2024 averaged 3.5%.
| Measure | Tract 3581 | Lexington |
|---|---|---|
| In the labor force (age 16+) | 67.8%±3.8 pts | 63.9% |
| Unemployment rate | 3.5%±1.7 pts | 2.9% |
| Drove alone to work | 50.4%±6.3 pts | 50.9% |
| Carpooled | 5.6%±3.2 pts | 4.3% |
| Public transportation | 4.8%±2.2 pts | 4.7% |
| Walked | 0.8%±0.9 pts | 1.8% |
| Worked from home | 37.8%±7.3 pts | 36.7% |
| Mean travel time to work | 31.5 min±2.8 | 30.7 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 3581 compare with the other tracts in Middlesex County?
Among Middlesex County's tracts with a reliable estimate, Census Tract 3581 ranks as shown below (1 = highest).
| Measure | In Middlesex County | In Lexington |
|---|---|---|
| Population | 125th of 354 | 5th of 6 |
| Residents per square mile | 240th of 357 | 1st of 6 |
| Median household income | 23rd of 350 | 5th of 6 |
| Per capita income | 35th of 354 | 6th of 6 |
| Median home value | 46th of 350 | 6th of 6 |
| Median gross rent | 62nd of 327 | 5th of 5 |
| Bachelor's degree or higher | 55th of 354 | 5th of 6 |
| Median age | 73rd of 354 | 6th of 6 |
| Owner-occupied share | 62nd of 351 | 2nd of 6 |
The tracts next to it on Middlesex County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3586 | 20th | $238,636±$33,218 · within the margin of this tract |
| Tract 3201.02 | 21st | $237,411±$30,001 · within the margin of this tract |
| Tract 3578 | 22nd | $235,063±$35,597 · within the margin of this tract |
| Tract 3581 | 23rd | $233,056±$39,449 |
| Tract 3632.01 | 24th | $232,000±$34,954 · within the margin of this tract |
| Tract 3381 | 25th | $227,083±$57,490 · within the margin of this tract |
| Tract 3201.06 | 26th | $226,689±$34,708 · 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 3581?
3 of the 18 figures for Census Tract 3581 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