Census tract · Middlesex County
Census Tract 3181, Middlesex County, Massachusetts
Census Tract 3181, GEOID 25017318100, in Middlesex County, Massachusetts, entirely within Westford. 6,886 residents in the ACS 2020-2024 5-year estimates (±616); the 2020 Census counted 6,825.
Residents, 2020-2024
6,886
±616 (90% margin)
2020 Census count: 6,825
Median household income
$175,588
±$35,744 (90% margin)
Middlesex County: $130,847
Median home value
$733,800
±$63,260 (90% margin)
Middlesex County: $727,800
Median gross rent
$3,114
±$1,984 (90% margin)
Middlesex County: $2,201
Where is Census Tract 3181?
Census Tract 3181 is one of 357 census tracts in Middlesex County, Massachusetts. It covers 6.06 square miles of land, 1,127 residents per square mile in 2020. Its GEOID, 25017318100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Westford | 100% |
5 census tracts border Census Tract 3181: Tract 3131.01 ($152,806), Tract 3172.01 ($182,153), Tract 3173.02 ($147,596), Tract 3182 ($162,321) and Tract 3183 ($218,359). 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 3181?
The 2020-2024 American Community Survey puts Census Tract 3181's population at 6,886 (±616) in 2,390 households; the 2020 Census counted 6,825 residents and 2,637 housing units.
| Measure | Tract 3181 | Westford |
|---|---|---|
| Total population | 6,886 ±616 | 24,690 |
| Households | 2,390 ±240 | 8,795 |
| Average household size | 2.88 ±0.16 | 2.79 |
| Housing units | 2,562 ±211 | 9,241 |
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 3181?
The median resident of Census Tract 3181 is 43.5 years old; 24.0% are under 18 and 17.0% are 65 or older. The largest group is non-Hispanic white residents at 73.0%, then non-Hispanic Asian residents at 20.5%. 18.9% of residents were born outside the United States.
| Measure | Tract 3181 | Westford |
|---|---|---|
| Median age | 43.5 ±4.5 | 42.8 |
| Under 18 years | 24.0% ±2.4 pts | 25.6% |
| 65 years and over | 17.0% ±4.5 pts | 14.6% |
| Hispanic or Latino (any race) | 3.1% ±2.6 pts | 3.6% |
| White alone, not Hispanic | 73.0% ±5.1 pts | 70.1% |
| Black or African American alone, not Hispanic | 0.0% ±0.1 pts | 0.2% |
| Asian alone, not Hispanic | 20.5% ±5.5 pts | 21.7% |
| 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 | 3.0% ±2.3 pts | 3.9% |
| Some other race alone, not Hispanic | 0.3% ±0.4 pts | 0.5% |
| Born outside the United States | 18.9% ±5.7 pts | 21.4% |
| Speak a language other than English at home (age 5+) | 21.1% ±5.9 pts | 25.9% |
| Civilian veterans (age 18+) | 6.2% ±3.2 pts | 5.7% |
| With a disability | 8.2% ±5.0 pts | 6.4% |
| No health insurance coverage | 1.1% ±0.8 pts | 2.3% |
| High school graduate or higher (age 25+) | 97.1% ±2.0 pts | 97.7% |
| Bachelor's degree or higher (age 25+) | 65.5% ±7.7 pts | 73.9% |
| Graduate or professional degree (age 25+) | 30.2% ±5.1 pts | 39.5% |
| Lived in the same house a year earlier | 94.4% ±3.5 pts | 90.3% |
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 3181 earn?
Half of the 2,390 households in Census Tract 3181 earn less than $175,588 a year (±$35,744), against $130,847 across Middlesex County: 69th highest of the county's 350 tracts with a reliable estimate. 1.4% of residents live below the poverty line.
| Measure | Tract 3181 | Westford |
|---|---|---|
| Median household income | $175,588 ±$35,744 | $187,198 |
| Mean household income | $195,732 ±$23,590 | $217,485 |
| Per capita income | $67,618 ±$7,532 | $77,741 |
| People below the poverty line | 1.4% ±0.9 pts | 3.2% |
| Children under 18 below the poverty line | 0.0% ±2.6 pts | 2.0% |
| Households receiving SNAP | 5.8% ±4.6 pts | 4.8% |
| Households with a computer | 95.5% ±6.1 pts | 98.6% |
| Households with a broadband subscription | 93.2% ±6.5 pts | 96.3% |
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 3181?
Owners occupy 92.1% of Census Tract 3181's occupied homes and renters 7.9%. The median owner-occupied home is valued at $733,800 by its owner (±$63,260). The median renter pays $3,114 a month including utilities.
| Measure | Tract 3181 | Westford |
|---|---|---|
| Median home value (owner-occupied) | $733,800 ±$63,260 | $748,500 |
| Median gross rent | $3,114 ±$1,984 | $2,436 |
| Renters paying 35% or more of income on rent | 34.5% ±34.6 pts | 41.4% |
| Median monthly owner costs, with a mortgage | $3,148 ±$498 | $3,555 |
| Owner-occupied homes | 92.1% ±4.8 pts | 85.9% |
| Renter-occupied homes | 7.9% ±4.8 pts | 14.1% |
| Housing units | 2,562 ±211 | 9,241 |
| Single-family detached homes | 94.5% ±2.6 pts | 79.2% |
| Mobile homes | 0.0% ±1.6 pts | 0.1% |
| Built 2020 or later | 0.0% ±1.6 pts | 1.3% |
| Built 2010 to 2019 | 5.6% ±3.6 pts | 9.3% |
| Built 1939 or earlier | 9.8% ±4.8 pts | 15.8% |
| Households with no vehicle | 2.1% ±3.2 pts | 1.3% |
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 3181 get to work?
63.3% of Census Tract 3181's workers drive alone and 26.2% work from home. The average trip to work takes 33.4 minutes. The unemployment rate in 2020-2024 averaged 7.3%.
| Measure | Tract 3181 | Westford |
|---|---|---|
| In the labor force (age 16+) | 66.5% ±6.0 pts | 71.0% |
| Unemployment rate | 7.3% ±3.7 pts | 4.8% |
| Drove alone to work | 63.3% ±5.5 pts | 64.6% |
| Carpooled | 6.6% ±3.7 pts | 5.4% |
| Public transportation | 2.6% ±2.0 pts | 1.1% |
| Walked | 0.5% ±0.8 pts | 1.0% |
| Worked from home | 26.2% ±5.7 pts | 27.0% |
| Mean travel time to work | 33.4 min ±3.7 | 30.9 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 3181 compare with the other tracts in Middlesex County?
Among Middlesex County's tracts with a reliable estimate, Census Tract 3181 ranks as shown below (1 = highest).
| Measure | In Middlesex County |
|---|---|
| Population | 35th of 354 |
| Residents per square mile | 301st of 357 |
| Median household income | 69th of 350 |
| Per capita income | 179th of 354 |
| Median home value | 177th of 350 |
| Median gross rent | 24th of 327 |
| Poverty rate | 222nd of 223 |
| Bachelor's degree or higher | 155th of 354 |
| Median age | 108th of 354 |
| Owner-occupied share | 31st of 351 |
The tracts next to it on Middlesex County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3544 | 66th | $176,705±$21,767 · within the margin of this tract |
| Tract 3508 | 67th | $175,962±$18,824 · within the margin of this tract |
| Tract 3872.02 | 68th | $175,638±$28,172 · within the margin of this tract |
| Tract 3181 | 69th | $175,588±$35,744 |
| Tract 3231.01 | 70th | $175,220±$21,717 · within the margin of this tract |
| Tract 3603 | 71st | $175,117±$43,879 · within the margin of this tract |
| Tract 3521.02 | 72nd | $175,110±$38,347 · 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 3181?
2 of the 18 figures for Census Tract 3181 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