Census tract · Suffolk County
Census Tract 821, Suffolk County, Massachusetts
Census Tract 821, GEOID 25025082100, in Suffolk County, Massachusetts, entirely within Boston. 4,288 residents in the ACS 2020-2024 5-year estimates (±1,088); the 2020 Census counted 5,224.
Residents, 2020-2024
4,288
±1,088 (90% margin)
2020 Census count: 5,224
Median household income
$29,719
±$9,250 (90% margin)
Suffolk County: $95,631
Median home value
$875,000
±$455,179 (90% margin)
Suffolk County: $705,800
Median gross rent
$799
±$392 (90% margin)
Suffolk County: $2,129
Where is Census Tract 821?
Census Tract 821 is one of 235 census tracts in Suffolk County, Massachusetts. It covers 0.14 square miles of land, 36,531 residents per square mile in 2020. Its GEOID, 25025082100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Boston | 100% |
5 census tracts border Census Tract 821: Tract 819 ($71,767), Tract 820 ($58,365), Tract 901 ($32,451), Tract 902 ($45,575) and Tract 9803*. The figure in brackets is each tract's median household income; * a special land-use tract (water, a park or an institution) with few or no residents.
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 821?
The 2020-2024 American Community Survey puts Census Tract 821's population at 4,288 (±1,088) in 1,999 households; the 2020 Census counted 5,224 residents and 2,150 housing units.
| Measure | Tract 821 | Boston |
|---|---|---|
| Total population | 4,288 ±1,088 | 666,442 |
| Households | 1,999 ±319 | 283,374 |
| Average household size | 2.13 ±0.40 | 2.19 |
| Housing units | 2,099 ±306 | 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 821?
The median resident of Census Tract 821 is 37.5 years old; 25.5% are under 18 and 16.7% are 65 or older. The largest group is Hispanic or Latino residents (of any race) at 51.5%, then non-Hispanic Black residents at 30.6%. 36.9% of residents were born outside the United States.
| Measure | Tract 821 | Boston |
|---|---|---|
| Median age | 37.5 ±8.0 | 33.3 |
| Under 18 years | 25.5% ±7.8 pts | 15.1% |
| 65 years and over | 16.7% ±6.1 pts | 13.0% |
| Hispanic or Latino (any race) | 51.5% ±17.5 pts | 19.3% |
| White alone, not Hispanic | 13.0% ±11.9 pts | 44.1% |
| Black or African American alone, not Hispanic | 30.6% ±15.1 pts | 19.3% |
| Asian alone, not Hispanic | 0.0% ±1.0 pts | 10.3% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±1.0 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±1.0 pts | 0.0% |
| Two or more races, not Hispanic | 0.5% ±0.8 pts | 5.9% |
| Some other race alone, not Hispanic | 4.4% ±6.9 pts | 1.0% |
| Born outside the United States | 36.9% ±11.6 pts | 27.8% |
| Speak a language other than English at home (age 5+) | 54.7% ±16.0 pts | 35.6% |
| Civilian veterans (age 18+) | 4.3% ±3.9 pts | 2.1% |
| With a disability | 22.1% ±7.9 pts | 12.4% |
| No health insurance coverage | 0.0% ±1.0 pts | 2.9% |
| High school graduate or higher (age 25+) | 79.6% ±10.0 pts | 88.9% |
| Bachelor's degree or higher (age 25+) | 9.1% ±5.9 pts | 54.9% |
| Graduate or professional degree (age 25+) | 3.4% ±3.4 pts | 26.1% |
| Lived in the same house a year earlier | 94.3% ±7.0 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 821 earn?
Half of the 1,999 households in Census Tract 821 earn less than $29,719 a year (±$9,250), against $95,631 across Suffolk County: 204th highest of the county's 209 tracts with a reliable estimate. 21.7% of residents live below the poverty line.
| Measure | Tract 821 | Boston |
|---|---|---|
| Median household income | $29,719 ±$9,250 | $97,344 |
| Mean household income | $51,897 ±$12,894 | $143,767 |
| Per capita income | $24,245 ±$4,373 | $61,698 |
| People below the poverty line | 21.7% ±13.7 pts | 16.6% |
| Children under 18 below the poverty line | 33.5% ±31.5 pts | 21.1% |
| Households receiving SNAP | 54.3% ±11.3 pts | 19.5% |
| Households with a computer | 90.4% ±6.3 pts | 95.6% |
| Households with a broadband subscription | 80.2% ±10.3 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 821?
The median owner-occupied home is valued at $875,000 by its owner (±$455,179). The median renter pays $799 a month including utilities, and 42.8% of renters pay 35% or more of their income on rent.
| Measure | Tract 821 | Boston |
|---|---|---|
| Median home value (owner-occupied) | $875,000 ±$455,179 | $731,700 |
| Median gross rent | $799 ±$392 | $2,147 |
| Renters paying 35% or more of income on rent | 42.8% ±14.8 pts | 41.3% |
| Owner-occupied homes | 10.8% ±8.4 pts | 35.7% |
| Renter-occupied homes | 89.2% ±8.4 pts | 64.3% |
| Housing units | 2,099 ±306 | 310,625 |
| Single-family detached homes | 7.7% ±7.3 pts | 11.9% |
| Mobile homes | 0.0% ±2.0 pts | 0.2% |
| Built 2020 or later | 0.0% ±2.0 pts | 1.4% |
| Built 2010 to 2019 | 0.0% ±2.0 pts | 10.0% |
| Built 1939 or earlier | 54.6% ±11.6 pts | 46.7% |
| Households with no vehicle | 49.7% ±12.1 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 821 get to work?
23.7% of Census Tract 821's workers drive alone. The average trip to work takes 42.3 minutes.
| Measure | Tract 821 | Boston |
|---|---|---|
| In the labor force (age 16+) | 58.4% ±10.6 pts | 70.0% |
| Unemployment rate | 11.7% ±9.7 pts | 6.1% |
| Drove alone to work | 23.7% ±11.7 pts | 32.9% |
| Carpooled | 2.4% ±7.7 pts | 5.2% |
| Public transportation | 47.1% ±17.1 pts | 22.6% |
| Walked | 3.5% ±5.4 pts | 13.4% |
| Worked from home | 11.9% ±9.0 pts | 21.3% |
| Mean travel time to work | 42.3 min ±9.9 | 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 821 compare with the other tracts in Suffolk County?
Among Suffolk County's tracts with a reliable estimate, Census Tract 821 ranks as shown below (1 = highest).
| Measure | In Suffolk County | In Boston |
|---|---|---|
| Population | 68th of 224 | 52nd of 197 |
| Residents per square mile | 49th of 234 | 46th of 206 |
| Median household income | 204th of 209 | 177th of 182 |
| Per capita income | 204th of 221 | 179th of 194 |
| Median home value | 52nd of 198 | 52nd of 171 |
| Median gross rent | 206th of 210 | 180th of 184 |
| Poverty rate | 67th of 181 | 61st of 161 |
| Bachelor's degree or higher | 218th of 218 | 191st of 191 |
| Median age | 77th of 225 | 62nd of 198 |
The tracts next to it on Suffolk County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 817 | 201st | $33,892±$18,012 · within the margin of this tract |
| Tract 901 | 202nd | $32,451±$7,425 · within the margin of this tract |
| Tract 813.02 | 203rd | $32,441±$7,517 · within the margin of this tract |
| Tract 821 | 204th | $29,719±$9,250 |
| Tract 804.01 | 205th | $29,375±$13,912 · within the margin of this tract |
| Tract 104.04 | 206th | $28,958±$11,288 · within the margin of this tract |
| Tract 611.01 | 207th | $27,474±$10,909 · 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 821?
4 of the 18 figures for Census Tract 821 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