Census tract · Middlesex County
Census Tract 3531.01, Middlesex County, Massachusetts
Census Tract 3531.01, GEOID 25017353101, in Middlesex County, Massachusetts, entirely within Cambridge. 3,721 residents in the ACS 2020-2024 5-year estimates (±369); the 2020 Census counted 3,641.
Residents, 2020-2024
3,721
±369 (90% margin)
2020 Census count: 3,641
Median household income
$78,542
±$53,684 (90% margin)
Middlesex County: $130,847
Median home value
not published
Middlesex County: $727,800
Median gross rent
$2,629
±$271 (90% margin)
Middlesex County: $2,201
Where is Census Tract 3531.01?
Census Tract 3531.01 is one of 357 census tracts in Middlesex County, Massachusetts. It covers 0.18 square miles of land, 20,688 residents per square mile in 2020. Its GEOID, 25017353101, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Cambridge | 100% |
7 census tracts border Census Tract 3531.01: Tract 3524 ($74,432), Tract 3525 ($132,500), Tract 3530 ($150,221), Tract 3531.02 ($71,302), Tract 3532 ($142,083), Tract 3533 ($183,750) and Tract 3594 ($120,307). 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 3531.01?
The 2020-2024 American Community Survey puts Census Tract 3531.01's population at 3,721 (±369) in 1,796 households; the 2020 Census counted 3,641 residents and 1,877 housing units.
| Measure | Tract 3531.01 | Cambridge |
|---|---|---|
| Total population | 3,721±369 | 118,796 |
| Households | 1,796±141 | 49,444 |
| Average household size | 1.80±0.12 | 2.05 |
| Housing units | 1,890±132 | 54,840 |
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 3531.01?
The median resident of Census Tract 3531.01 is 29.7 years old; 9.0% are under 18 and 10.4% are 65 or older. The largest group is non-Hispanic white residents at 42.9%, then non-Hispanic Asian residents at 25.4%. 38.7% of residents were born outside the United States.
| Measure | Tract 3531.01 | Cambridge |
|---|---|---|
| Median age | 29.7±1.8 | 30.4 |
| Under 18 years | 9.0%±4.0 pts | 12.4% |
| 65 years and over | 10.4%±2.7 pts | 12.2% |
| Hispanic or Latino (any race) | 6.9%±2.9 pts | 8.8% |
| White alone, not Hispanic | 42.9%±6.6 pts | 53.8% |
| Black or African American alone, not Hispanic | 10.8%±7.0 pts | 10.3% |
| Asian alone, not Hispanic | 25.4%±5.5 pts | 20.2% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±1.1 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.1 pts | 0.1% |
| Two or more races, not Hispanic | 7.0%±4.3 pts | 5.8% |
| Some other race alone, not Hispanic | 7.0%±6.4 pts | 0.9% |
| Born outside the United States | 38.7%±6.5 pts | 29.7% |
| Speak a language other than English at home (age 5+) | 39.4%±6.3 pts | 35.2% |
| Civilian veterans (age 18+) | 1.1%±0.9 pts | 1.6% |
| With a disability | 11.5%±4.1 pts | 7.5% |
| No health insurance coverage | 0.9%±0.9 pts | 1.7% |
| High school graduate or higher (age 25+) | 92.8%±3.5 pts | 96.0% |
| Bachelor's degree or higher (age 25+) | 80.6%±6.1 pts | 80.8% |
| Graduate or professional degree (age 25+) | 49.5%±7.8 pts | 51.2% |
| Lived in the same house a year earlier | 65.4%±9.5 pts | 74.5% |
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 3531.01 earn?
The median household income for Census Tract 3531.01 is published as $78,542 with a margin of ±$53,684, too wide to rely on. 24.6% of residents live below the poverty line.
| Measure | Tract 3531.01 | Cambridge |
|---|---|---|
| Median household income | $78,542±$53,684 | $130,748 |
| Mean household income | $142,186±$29,503 | $183,408 |
| Per capita income | $75,013±$14,192 | $78,723 |
| People below the poverty line | 24.6%±10.1 pts | 12.8% |
| Children under 18 below the poverty line | 52.9%±40.5 pts | 15.2% |
| Households receiving SNAP | 16.3%±9.5 pts | 8.4% |
| Households with a computer | 98.0%±1.9 pts | 98.5% |
| Households with a broadband subscription | 92.4%±5.0 pts | 94.8% |
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 3531.01?
Owners occupy 4.3% of Census Tract 3531.01's occupied homes and renters 95.7%. The median renter pays $2,629 a month including utilities, and 43.4% of renters pay 35% or more of their income on rent.
| Measure | Tract 3531.01 | Cambridge |
|---|---|---|
| Median gross rent | $2,629±$271 | $2,787 |
| Renters paying 35% or more of income on rent | 43.4%±9.3 pts | 35.4% |
| Median monthly owner costs, with a mortgage | $3,386±$2,613 | $3,505 |
| Owner-occupied homes | 4.3%±2.4 pts | 33.5% |
| Renter-occupied homes | 95.7%±2.4 pts | 66.5% |
| Housing units | 1,890±132 | 54,840 |
| Single-family detached homes | 0.0%±2.2 pts | 9.9% |
| Mobile homes | 0.0%±2.2 pts | 0.1% |
| Built 2020 or later | 8.3%±6.5 pts | 2.2% |
| Built 2010 to 2019 | 12.4%±4.5 pts | 10.1% |
| Built 1939 or earlier | 28.3%±8.6 pts | 47.0% |
| Households with no vehicle | 63.0%±9.9 pts | 33.2% |
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 3531.01 get to work?
The average trip to work takes 24.1 minutes. The unemployment rate in 2020-2024 averaged 7.0%.
| Measure | Tract 3531.01 | Cambridge |
|---|---|---|
| In the labor force (age 16+) | 69.9%±6.6 pts | 69.6% |
| Unemployment rate | 7.0%±3.6 pts | 3.4% |
| Drove alone to work | 3.0%±2.0 pts | 19.7% |
| Carpooled | 0.3%±0.5 pts | 2.5% |
| Public transportation | 25.7%±7.4 pts | 18.0% |
| Walked | 23.2%±6.3 pts | 19.2% |
| Worked from home | 32.4%±7.5 pts | 30.8% |
| Mean travel time to work | 24.1 min±3.0 | 25.8 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 3531.01 compare with the other tracts in Middlesex County?
Among Middlesex County's tracts with a reliable estimate, Census Tract 3531.01 ranks as shown below (1 = highest).
| Measure | In Middlesex County | In Cambridge |
|---|---|---|
| Population | 239th of 354 | 13th of 33 |
| Residents per square mile | 48th of 357 | 18th of 33 |
| Per capita income | 132nd of 354 | 19th of 33 |
| Median gross rent | 87th of 327 | 25th of 33 |
| Poverty rate | 14th of 223 | 4th of 30 |
| Bachelor's degree or higher | 67th of 354 | 20th of 33 |
| Median age | 337th of 354 | 26th of 33 |
| Owner-occupied share | 351st of 351 | 30th of 30 |
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 3531.01?
2 of the 17 figures for Census Tract 3531.01 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