Census tract · Middlesex County
Census Tract 3211, Middlesex County, Massachusetts
Census Tract 3211, GEOID 25017321100, in Middlesex County, Massachusetts, entirely within Marlborough. 6,976 residents in the ACS 2020-2024 5-year estimates (±910); the 2020 Census counted 7,218.
Residents, 2020-2024
6,976
±910 (90% margin)
2020 Census count: 7,218
Median household income
$86,250
±$17,711 (90% margin)
Middlesex County: $130,847
Median home value
$556,200
±$70,609 (90% margin)
Middlesex County: $727,800
Median gross rent
$1,899
±$415 (90% margin)
Middlesex County: $2,201
Where is Census Tract 3211?
Census Tract 3211 is one of 357 census tracts in Middlesex County, Massachusetts. It covers 5.88 square miles of land, 1,228 residents per square mile in 2020. Its GEOID, 25017321100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Marlborough | 100% |
6 census tracts border Census Tract 3211: Tract 3212 ($96,164), Tract 3216 ($104,375), Tract 3221 ($165,023), Tract 3652.02 ($222,614), Tract 3839.04 ($146,635) and Tract 7411.01 in Worcester County ($186,058). 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 3211?
The 2020-2024 American Community Survey puts Census Tract 3211's population at 6,976 (±910) in 2,985 households; the 2020 Census counted 7,218 residents and 3,120 housing units.
| Measure | Tract 3211 | Marlborough |
|---|---|---|
| Total population | 6,976 ±910 | 41,647 |
| Households | 2,985 ±304 | 16,665 |
| Average household size | 2.30 ±0.28 | 2.46 |
| Housing units | 3,024 ±320 | 17,247 |
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 3211?
The median resident of Census Tract 3211 is 42.6 years old; 21.9% are under 18 and 20.6% are 65 or older. The largest group is non-Hispanic white residents at 55.9%, then non-Hispanic residents of two or more races at 16.4%. 29.1% of residents were born outside the United States.
| Measure | Tract 3211 | Marlborough |
|---|---|---|
| Median age | 42.6 ±6.9 | 37.5 |
| Under 18 years | 21.9% ±4.7 pts | 20.8% |
| 65 years and over | 20.6% ±4.0 pts | 14.9% |
| Hispanic or Latino (any race) | 12.8% ±6.2 pts | 18.0% |
| White alone, not Hispanic | 55.9% ±7.8 pts | 54.1% |
| Black or African American alone, not Hispanic | 2.8% ±2.1 pts | 3.7% |
| Asian alone, not Hispanic | 11.3% ±5.3 pts | 5.3% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.6 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.6 pts | 0.0% |
| Two or more races, not Hispanic | 16.4% ±8.8 pts | 15.1% |
| Some other race alone, not Hispanic | 0.7% ±1.0 pts | 3.9% |
| Born outside the United States | 29.1% ±8.0 pts | 30.8% |
| Speak a language other than English at home (age 5+) | 39.3% ±7.8 pts | 42.2% |
| Civilian veterans (age 18+) | 4.0% ±1.8 pts | 4.0% |
| With a disability | 11.3% ±3.8 pts | 10.4% |
| No health insurance coverage | 3.5% ±3.4 pts | 4.3% |
| High school graduate or higher (age 25+) | 91.9% ±4.5 pts | 87.9% |
| Bachelor's degree or higher (age 25+) | 43.3% ±8.0 pts | 40.5% |
| Graduate or professional degree (age 25+) | 17.8% ±5.5 pts | 16.2% |
| Lived in the same house a year earlier | 83.7% ±7.9 pts | 85.4% |
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 3211 earn?
Half of the 2,985 households in Census Tract 3211 earn less than $86,250 a year (±$17,711), against $130,847 across Middlesex County: 310th highest of the county's 350 tracts with a reliable estimate. 7.0% of residents live below the poverty line.
| Measure | Tract 3211 | Marlborough |
|---|---|---|
| Median household income | $86,250 ±$17,711 | $91,968 |
| Mean household income | $125,117 ±$17,848 | $115,215 |
| Per capita income | $52,935 ±$7,330 | $46,241 |
| People below the poverty line | 7.0% ±4.1 pts | 9.6% |
| Children under 18 below the poverty line | 10.3% ±11.4 pts | 9.4% |
| Households receiving SNAP | 17.0% ±6.5 pts | 13.2% |
| Households with a computer | 93.4% ±5.1 pts | 95.1% |
| Households with a broadband subscription | 91.0% ±6.0 pts | 93.2% |
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 3211?
Owners occupy 67.1% of Census Tract 3211's occupied homes and renters 32.9%. The median owner-occupied home is valued at $556,200 by its owner (±$70,609). The median renter pays $1,899 a month including utilities, and 65.9% of renters pay 35% or more of their income on rent.
| Measure | Tract 3211 | Marlborough |
|---|---|---|
| Median home value (owner-occupied) | $556,200 ±$70,609 | $513,100 |
| Median gross rent | $1,899 ±$415 | $1,871 |
| Renters paying 35% or more of income on rent | 65.9% ±14.4 pts | 49.6% |
| Median monthly owner costs, with a mortgage | $2,768 ±$329 | $2,587 |
| Owner-occupied homes | 67.1% ±8.2 pts | 56.0% |
| Renter-occupied homes | 32.9% ±8.2 pts | 44.0% |
| Housing units | 3,024 ±320 | 17,247 |
| Single-family detached homes | 50.5% ±7.6 pts | 43.6% |
| Mobile homes | 6.4% ±3.3 pts | 3.2% |
| Built 2020 or later | 0.8% ±0.7 pts | 1.6% |
| Built 2010 to 2019 | 1.6% ±1.8 pts | 7.1% |
| Built 1939 or earlier | 1.9% ±1.8 pts | 20.8% |
| Households with no vehicle | 8.1% ±5.4 pts | 8.1% |
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 3211 get to work?
60.9% of Census Tract 3211's workers drive alone and 25.7% work from home. The average trip to work takes 36.3 minutes.
| Measure | Tract 3211 | Marlborough |
|---|---|---|
| In the labor force (age 16+) | 64.5% ±5.4 pts | 72.2% |
| Unemployment rate | 10.0% ±6.7 pts | 5.5% |
| Drove alone to work | 60.9% ±8.8 pts | 65.2% |
| Carpooled | 3.0% ±3.2 pts | 12.3% |
| Public transportation | 1.3% ±1.4 pts | 0.4% |
| Walked | 1.9% ±2.5 pts | 1.9% |
| Worked from home | 25.7% ±8.1 pts | 16.2% |
| Mean travel time to work | 36.3 min ±6.4 | 29.7 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 3211 compare with the other tracts in Middlesex County?
Among Middlesex County's tracts with a reliable estimate, Census Tract 3211 ranks as shown below (1 = highest).
| Measure | In Middlesex County | In Marlborough |
|---|---|---|
| Population | 27th of 354 | 4th of 7 |
| Residents per square mile | 292nd of 357 | 6th of 7 |
| Median household income | 310th of 350 | 6th of 7 |
| Per capita income | 268th of 354 | 2nd of 7 |
| Median home value | 282nd of 350 | 2nd of 7 |
| Median gross rent | 220th of 327 | 3rd of 7 |
| Poverty rate | 134th of 223 | 6th of 6 |
| Bachelor's degree or higher | 274th of 354 | 2nd of 7 |
| Median age | 126th of 354 | 2nd of 7 |
| Owner-occupied share | 153rd of 351 | 1st of 7 |
The tracts next to it on Middlesex County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3412 | 307th | $87,668±$15,614 · within the margin of this tract |
| Tract 3703.02 | 308th | $87,473±$24,235 · within the margin of this tract |
| Tract 3118 | 309th | $86,518±$40,438 · within the margin of this tract |
| Tract 3211 | 310th | $86,250±$17,711 |
| Tract 3540 | 311th | $85,592±$12,979 · within the margin of this tract |
| Tract 3515 | 312th | $85,274±$26,106 · within the margin of this tract |
| Tract 3834.01 | 313th | $85,000±$44,065 · 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 3211?
1 of the 18 figures for Census Tract 3211 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