Census tract · Suffolk County
Census Tract 401, Suffolk County, Massachusetts
Census Tract 401, GEOID 25025040100, in Suffolk County, Massachusetts, entirely within Boston. 2,717 residents in the ACS 2020-2024 5-year estimates (±320); the 2020 Census counted 2,360.
Residents, 2020-2024
2,717
±320 (90% margin)
2020 Census count: 2,360
Median household income
$202,167
±$36,774 (90% margin)
Suffolk County: $95,631
Median home value
$1,113,800
±$118,536 (90% margin)
Suffolk County: $705,800
Median gross rent
$2,277
±$600 (90% margin)
Suffolk County: $2,129
Where is Census Tract 401?
Census Tract 401 is one of 235 census tracts in Suffolk County, Massachusetts. It covers 0.10 square miles of land, 23,137 residents per square mile in 2020. Its GEOID, 25025040100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Boston | 100% |
5 census tracts border Census Tract 401: Tract 305 ($126,786), Tract 402, Tract 403 ($208,319), Tract 404.01 ($168,883) and Tract 408.01 ($105,580). 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 401?
The 2020-2024 American Community Survey puts Census Tract 401's population at 2,717 (±320) in 1,256 households; the 2020 Census counted 2,360 residents and 1,255 housing units.
| Measure | Tract 401 | Boston |
|---|---|---|
| Total population | 2,717±320 | 666,442 |
| Households | 1,256±122 | 283,374 |
| Average household size | 2.16±0.22 | 2.19 |
| Housing units | 1,283±111 | 310,625 |
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 401?
The median resident of Census Tract 401 is 36.9 years old; 19.2% are under 18 and 15.4% are 65 or older. The largest group is non-Hispanic white residents at 83.9%, then non-Hispanic residents of two or more races at 7.5%. 10.8% of residents were born outside the United States.
| Measure | Tract 401 | Boston |
|---|---|---|
| Median age | 36.9±4.6 | 33.3 |
| Under 18 years | 19.2%±4.8 pts | 15.1% |
| 65 years and over | 15.4%±3.8 pts | 13.0% |
| Hispanic or Latino (any race) | 2.4%±2.1 pts | 19.3% |
| White alone, not Hispanic | 83.9%±7.7 pts | 44.1% |
| Black or African American alone, not Hispanic | 0.0%±1.5 pts | 19.3% |
| Asian alone, not Hispanic | 6.3%±6.6 pts | 10.3% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±1.5 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±1.5 pts | 0.0% |
| Two or more races, not Hispanic | 7.5%±7.4 pts | 5.9% |
| Some other race alone, not Hispanic | 0.0%±1.5 pts | 1.0% |
| Born outside the United States | 10.8%±5.4 pts | 27.8% |
| Speak a language other than English at home (age 5+) | 9.0%±5.2 pts | 35.6% |
| Civilian veterans (age 18+) | 3.3%±2.7 pts | 2.1% |
| With a disability | 6.6%±3.4 pts | 12.4% |
| No health insurance coverage | 0.6%±1.1 pts | 2.9% |
| High school graduate or higher (age 25+) | 97.2%±2.2 pts | 88.9% |
| Bachelor's degree or higher (age 25+) | 85.0%±5.1 pts | 54.9% |
| Graduate or professional degree (age 25+) | 38.4%±6.8 pts | 26.1% |
| Lived in the same house a year earlier | 86.8%±4.9 pts | 80.3% |
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 401 earn?
Half of the 1,256 households in Census Tract 401 earn less than $202,167 a year (±$36,774), against $95,631 across Suffolk County: 10th highest of the county's 209 tracts with a reliable estimate. 3.8% of residents live below the poverty line.
| Measure | Tract 401 | Boston |
|---|---|---|
| Median household income | $202,167±$36,774 | $97,344 |
| Mean household income | $305,207±$57,648 | $143,767 |
| Per capita income | $145,151±$29,191 | $61,698 |
| People below the poverty line | 3.8%±1.7 pts | 16.6% |
| Children under 18 below the poverty line | 0.0%±7.8 pts | 21.1% |
| Households receiving SNAP | 5.3%±3.2 pts | 19.5% |
| Households with a computer | 93.6%±5.0 pts | 95.6% |
| Households with a broadband subscription | 92.2%±5.4 pts | 92.0% |
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 401?
Owners occupy 58.8% of Census Tract 401's occupied homes and renters 41.2%. The median owner-occupied home is valued at $1,113,800 by its owner (±$118,536). The median renter pays $2,277 a month including utilities, and 18.0% of renters pay 35% or more of their income on rent.
| Measure | Tract 401 | Boston |
|---|---|---|
| Median home value (owner-occupied) | $1,113,800±$118,536 | $731,700 |
| Median gross rent | $2,277±$600 | $2,147 |
| Renters paying 35% or more of income on rent | 18.0%±9.0 pts | 41.3% |
| Median monthly owner costs, with a mortgage | $4,000 or more | $2,986 |
| Owner-occupied homes | 58.8%±8.0 pts | 35.7% |
| Renter-occupied homes | 41.2%±8.0 pts | 64.3% |
| Housing units | 1,283±111 | 310,625 |
| Single-family detached homes | 1.2%±1.8 pts | 11.9% |
| Mobile homes | 0.0%±3.3 pts | 0.2% |
| Built 2020 or later | 0.3%±0.6 pts | 1.4% |
| Built 2010 to 2019 | 3.9%±2.6 pts | 10.0% |
| Built 1939 or earlier | 66.4%±7.7 pts | 46.7% |
| Households with no vehicle | 20.5%±6.9 pts | 33.3% |
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 401 get to work?
23.5% of Census Tract 401's workers drive alone and 32.9% work from home. The average trip to work takes 26.4 minutes.
| Measure | Tract 401 | Boston |
|---|---|---|
| In the labor force (age 16+) | 81.8%±4.9 pts | 70.0% |
| Unemployment rate | 1.6%±2.0 pts | 6.1% |
| Drove alone to work | 23.5%±6.2 pts | 32.9% |
| Carpooled | 3.2%±3.0 pts | 5.2% |
| Public transportation | 12.5%±5.6 pts | 22.6% |
| Walked | 14.5%±5.2 pts | 13.4% |
| Worked from home | 32.9%±9.2 pts | 21.3% |
| Mean travel time to work | 26.4 min±2.4 | 30.3 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 401 compare with the other tracts in Suffolk County?
Among Suffolk County's tracts with a reliable estimate, Census Tract 401 ranks as shown below (1 = highest).
| Measure | In Suffolk County | In Boston |
|---|---|---|
| Population | 146th of 224 | 123rd of 197 |
| Residents per square mile | 98th of 234 | 93rd of 206 |
| Median household income | 10th of 209 | 10th of 182 |
| Per capita income | 15th of 221 | 15th of 194 |
| Median home value | 21st of 198 | 21st of 171 |
| Median gross rent | 87th of 210 | 81st of 184 |
| Poverty rate | 175th of 181 | 156th of 161 |
| Bachelor's degree or higher | 30th of 218 | 30th of 191 |
| Median age | 84th of 225 | 69th of 198 |
| Owner-occupied share | 37th of 200 | 31st of 173 |
The tracts next to it on Suffolk County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 705.01 | 7th | $225,000±$41,786 · within the margin of this tract |
| Tract 403 | 8th | $208,319±$49,898 · within the margin of this tract |
| Tract 604 | 9th | $207,368±$34,444 · within the margin of this tract |
| Tract 401 | 10th | $202,167±$36,774 |
| Tract 1201.05 | 11th | $198,250±$23,961 · within the margin of this tract |
| Tract 605.01 | 12th | $191,469±$32,521 · within the margin of this tract |
| Tract 107.02 | 13th | $191,406±$83,040 · 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 401?
3 of the 18 figures for Census Tract 401 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