Census tract · Middlesex County
Census Tract 3171.01, Middlesex County, Massachusetts
Census Tract 3171.01, GEOID 25017317101, in Middlesex County, Massachusetts, entirely within Chelmsford. 6,315 residents in the ACS 2020-2024 5-year estimates (±623); the 2020 Census counted 6,966.
Residents, 2020-2024
6,315
±623 (90% margin)
2020 Census count: 6,966
Median household income
$105,344
±$22,541 (90% margin)
Middlesex County: $130,847
Median home value
$577,500
±$56,382 (90% margin)
Middlesex County: $727,800
Median gross rent
$1,947
±$266 (90% margin)
Middlesex County: $2,201
Where is Census Tract 3171.01?
Census Tract 3171.01 is one of 357 census tracts in Middlesex County, Massachusetts. It covers 3.84 square miles of land, 1,816 residents per square mile in 2020. Its GEOID, 25017317101, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Chelmsford | 100% |
7 census tracts border Census Tract 3171.01: Tract 3171.02 ($130,750), Tract 3171.03 ($167,614), Tract 3172.01 ($182,153), Tract 3172.02 ($190,938), Tract 3172.03 ($143,935), Tract 3183 ($218,359) and Tract 3184 ($155,909). 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 3171.01?
The 2020-2024 American Community Survey puts Census Tract 3171.01's population at 6,315 (±623) in 3,004 households; the 2020 Census counted 6,966 residents and 3,251 housing units.
| Measure | Tract 3171.01 | Chelmsford |
|---|---|---|
| Total population | 6,315 ±623 | 36,446 |
| Households | 3,004 ±343 | 13,450 |
| Average household size | 2.10 ±0.15 | 2.68 |
| Housing units | 3,122 ±329 | 13,942 |
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 3171.01?
The median resident of Census Tract 3171.01 is 47.5 years old; 18.2% are under 18 and 20.6% are 65 or older. The largest group is non-Hispanic white residents at 70.6%, then non-Hispanic Asian residents at 12.5%. 20.6% of residents were born outside the United States.
| Measure | Tract 3171.01 | Chelmsford |
|---|---|---|
| Median age | 47.5 ±6.2 | 41.6 |
| Under 18 years | 18.2% ±3.1 pts | 21.6% |
| 65 years and over | 20.6% ±4.5 pts | 18.1% |
| Hispanic or Latino (any race) | 11.6% ±5.1 pts | 6.1% |
| White alone, not Hispanic | 70.6% ±7.4 pts | 77.1% |
| Black or African American alone, not Hispanic | 1.6% ±1.6 pts | 1.9% |
| Asian alone, not Hispanic | 12.5% ±4.4 pts | 10.8% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.7 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.1% ±0.2 pts | 0.0% |
| Two or more races, not Hispanic | 3.6% ±2.7 pts | 3.3% |
| Some other race alone, not Hispanic | 0.0% ±0.7 pts | 0.5% |
| Born outside the United States | 20.6% ±5.3 pts | 13.5% |
| Speak a language other than English at home (age 5+) | 26.4% ±6.8 pts | 17.2% |
| Civilian veterans (age 18+) | 4.6% ±2.1 pts | 4.6% |
| With a disability | 16.9% ±4.6 pts | 11.2% |
| No health insurance coverage | 1.1% ±1.1 pts | 1.2% |
| High school graduate or higher (age 25+) | 93.9% ±4.2 pts | 93.8% |
| Bachelor's degree or higher (age 25+) | 49.9% ±7.8 pts | 52.8% |
| Graduate or professional degree (age 25+) | 26.5% ±5.6 pts | 24.3% |
| Lived in the same house a year earlier | 88.3% ±5.0 pts | 91.7% |
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 3171.01 earn?
Half of the 3,004 households in Census Tract 3171.01 earn less than $105,344 a year (±$22,541), against $130,847 across Middlesex County: 261st highest of the county's 350 tracts with a reliable estimate. 7.9% of residents live below the poverty line.
| Measure | Tract 3171.01 | Chelmsford |
|---|---|---|
| Median household income | $105,344 ±$22,541 | $140,629 |
| Mean household income | $135,470 ±$24,795 | $162,009 |
| Per capita income | $64,326 ±$11,008 | $60,022 |
| People below the poverty line | 7.9% ±4.2 pts | 4.7% |
| Children under 18 below the poverty line | 4.5% ±6.2 pts | 3.2% |
| Households receiving SNAP | 18.3% ±7.1 pts | 10.0% |
| Households with a computer | 98.9% ±1.3 pts | 97.5% |
| Households with a broadband subscription | 94.0% ±3.8 pts | 95.2% |
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 3171.01?
Owners occupy 63.5% of Census Tract 3171.01's occupied homes and renters 36.5%. The median owner-occupied home is valued at $577,500 by its owner (±$56,382). The median renter pays $1,947 a month including utilities, and 47.4% of renters pay 35% or more of their income on rent.
| Measure | Tract 3171.01 | Chelmsford |
|---|---|---|
| Median home value (owner-occupied) | $577,500 ±$56,382 | $593,700 |
| Median gross rent | $1,947 ±$266 | $2,062 |
| Renters paying 35% or more of income on rent | 47.4% ±16.0 pts | 46.7% |
| Median monthly owner costs, with a mortgage | $3,414 ±$425 | $2,983 |
| Owner-occupied homes | 63.5% ±6.8 pts | 82.1% |
| Renter-occupied homes | 36.5% ±6.8 pts | 17.9% |
| Housing units | 3,122 ±329 | 13,942 |
| Single-family detached homes | 40.0% ±5.9 pts | 66.7% |
| Mobile homes | 8.5% ±2.5 pts | 1.9% |
| Built 2020 or later | 0.0% ±1.3 pts | 0.6% |
| Built 2010 to 2019 | 11.7% ±4.8 pts | 5.7% |
| Built 1939 or earlier | 18.9% ±6.7 pts | 15.0% |
| Households with no vehicle | 7.7% ±4.0 pts | 5.0% |
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 3171.01 get to work?
58.7% of Census Tract 3171.01's workers drive alone and 27.9% work from home. The average trip to work takes 28.2 minutes. The unemployment rate in 2020-2024 averaged 10.9%.
| Measure | Tract 3171.01 | Chelmsford |
|---|---|---|
| In the labor force (age 16+) | 65.2% ±5.1 pts | 69.0% |
| Unemployment rate | 10.9% ±4.9 pts | 5.3% |
| Drove alone to work | 58.7% ±8.6 pts | 68.8% |
| Carpooled | 6.1% ±4.5 pts | 4.2% |
| Public transportation | 1.3% ±1.3 pts | 1.0% |
| Walked | 1.6% ±2.4 pts | 1.5% |
| Worked from home | 27.9% ±7.4 pts | 22.8% |
| Mean travel time to work | 28.2 min ±4.9 | 28.0 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 3171.01 compare with the other tracts in Middlesex County?
Among Middlesex County's tracts with a reliable estimate, Census Tract 3171.01 ranks as shown below (1 = highest).
| Measure | In Middlesex County |
|---|---|
| Population | 59th of 354 |
| Residents per square mile | 265th of 357 |
| Median household income | 261st of 350 |
| Per capita income | 201st of 354 |
| Median home value | 274th of 350 |
| Median gross rent | 215th of 327 |
| Poverty rate | 117th of 223 |
| Bachelor's degree or higher | 240th of 354 |
| Median age | 32nd of 354 |
| Owner-occupied share | 172nd of 351 |
The tracts next to it on Middlesex County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3741 | 258th | $106,458±$31,406 · within the margin of this tract |
| Tract 3415 | 259th | $105,828±$9,247 · within the margin of this tract |
| Tract 3395 | 260th | $105,625±$32,201 · within the margin of this tract |
| Tract 3171.01 | 261st | $105,344±$22,541 |
| Tract 3335.02 | 262nd | $105,313±$37,637 · within the margin of this tract |
| Tract 3154.01 | 263rd | $104,913±$13,215 · within the margin of this tract |
| Tract 3840.03 | 264th | $104,837±$27,147 · 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 3171.01?
1 of the 18 figures for Census Tract 3171.01 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