Census tract · Norfolk County
Census Tract 4009, Norfolk County, Massachusetts
Census Tract 4009, GEOID 25021400900, in Norfolk County, Massachusetts, entirely within Brookline. 4,115 residents in the ACS 2020-2024 5-year estimates (±515); the 2020 Census counted 4,354.
Residents, 2020-2024
4,115
±515 (90% margin)
2020 Census count: 4,354
Median household income
$82,109
±$27,737 (90% margin)
Norfolk County: $130,739
Median home value
$906,700
±$129,138 (90% margin)
Norfolk County: $683,900
Median gross rent
$2,596
±$135 (90% margin)
Norfolk County: $2,149
Where is Census Tract 4009?
Census Tract 4009 is one of 154 census tracts in Norfolk County, Massachusetts. It covers 0.15 square miles of land, 29,221 residents per square mile in 2020. Its GEOID, 25021400900, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Brookline | 100% |
4 census tracts border Census Tract 4009: Tract 4007 ($175,000), Tract 4008 ($143,723), Tract 4010 ($138,182) and Tract 9818 in Suffolk County*. 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 4009?
The 2020-2024 American Community Survey puts Census Tract 4009's population at 4,115 (±515) in 2,037 households; the 2020 Census counted 4,354 residents and 2,167 housing units.
| Measure | Tract 4009 | Brookline |
|---|---|---|
| Total population | 4,115±515 | 63,266 |
| Households | 2,037±206 | 27,587 |
| Average household size | 2.02±0.15 | 2.24 |
| Housing units | 2,192±183 | 28,873 |
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 4009?
The median resident of Census Tract 4009 is 32.4 years old; 17.0% are under 18 and 14.0% are 65 or older. The largest group is non-Hispanic white residents at 54.4%, then non-Hispanic Asian residents at 24.4%. 31.2% of residents were born outside the United States.
| Measure | Tract 4009 | Brookline |
|---|---|---|
| Median age | 32.4±2.5 | 35.2 |
| Under 18 years | 17.0%±4.7 pts | 18.7% |
| 65 years and over | 14.0%±4.3 pts | 15.8% |
| Hispanic or Latino (any race) | 7.3%±4.7 pts | 6.2% |
| White alone, not Hispanic | 54.4%±8.7 pts | 64.1% |
| Black or African American alone, not Hispanic | 4.3%±2.9 pts | 3.0% |
| Asian alone, not Hispanic | 24.4%±6.5 pts | 19.3% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±1.0 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±1.0 pts | 0.0% |
| Two or more races, not Hispanic | 6.7%±3.8 pts | 6.8% |
| Some other race alone, not Hispanic | 3.0%±4.6 pts | 0.6% |
| Born outside the United States | 31.2%±8.0 pts | 27.8% |
| Speak a language other than English at home (age 5+) | 38.8%±9.3 pts | 31.2% |
| Civilian veterans (age 18+) | 0.9%±1.0 pts | 2.0% |
| With a disability | 9.4%±3.4 pts | 7.5% |
| No health insurance coverage | 0.5%±0.7 pts | 1.0% |
| High school graduate or higher (age 25+) | 97.2%±2.1 pts | 97.6% |
| Bachelor's degree or higher (age 25+) | 78.8%±6.5 pts | 85.4% |
| Graduate or professional degree (age 25+) | 58.7%±7.9 pts | 57.9% |
| Lived in the same house a year earlier | 80.9%±6.0 pts | 78.8% |
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 4009 earn?
Half of the 2,037 households in Census Tract 4009 earn less than $82,109 a year (±$27,737), against $130,739 across Norfolk County: 143rd highest of the county's 152 tracts with a reliable estimate. 15.3% of residents live below the poverty line.
| Measure | Tract 4009 | Brookline |
|---|---|---|
| Median household income | $82,109±$27,737 | $142,101 |
| Mean household income | $133,005±$24,106 | $219,714 |
| Per capita income | $66,238±$11,278 | $96,682 |
| People below the poverty line | 15.3%±5.9 pts | 8.7% |
| Children under 18 below the poverty line | 5.3%±5.6 pts | 4.7% |
| Households receiving SNAP | 10.8%±5.5 pts | 6.1% |
| Households with a computer | 94.7%±4.3 pts | 97.3% |
| Households with a broadband subscription | 93.4%±4.7 pts | 96.1% |
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 4009?
Owners occupy 38.0% of Census Tract 4009's occupied homes and renters 62.0%. The median owner-occupied home is valued at $906,700 by its owner (±$129,138). The median renter pays $2,596 a month including utilities, and 45.7% of renters pay 35% or more of their income on rent.
| Measure | Tract 4009 | Brookline |
|---|---|---|
| Median home value (owner-occupied) | $906,700±$129,138 | $1,246,800 |
| Median gross rent | $2,596±$135 | $2,835 |
| Renters paying 35% or more of income on rent | 45.7%±11.3 pts | 37.6% |
| Median monthly owner costs, with a mortgage | $3,343±$392 | $4,000 or more |
| Owner-occupied homes | 38.0%±8.2 pts | 46.9% |
| Renter-occupied homes | 62.0%±8.2 pts | 53.1% |
| Housing units | 2,192±183 | 28,873 |
| Single-family detached homes | 6.0%±3.6 pts | 18.3% |
| Mobile homes | 0.0%±1.9 pts | 0.0% |
| Built 2020 or later | 0.0%±1.9 pts | 0.4% |
| Built 2010 to 2019 | 0.0%±1.9 pts | 2.7% |
| Built 1939 or earlier | 37.2%±7.3 pts | 51.7% |
| Households with no vehicle | 34.3%±7.3 pts | 26.9% |
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 4009 get to work?
16.6% of Census Tract 4009's workers drive alone and 30.8% work from home. The average trip to work takes 23.8 minutes.
| Measure | Tract 4009 | Brookline |
|---|---|---|
| In the labor force (age 16+) | 70.1%±6.9 pts | 73.2% |
| Unemployment rate | 3.1%±2.1 pts | 3.6% |
| Drove alone to work | 16.6%±6.3 pts | 28.4% |
| Carpooled | 2.5%±2.2 pts | 3.2% |
| Public transportation | 16.0%±6.5 pts | 18.1% |
| Walked | 31.1%±8.7 pts | 14.9% |
| Worked from home | 30.8%±8.0 pts | 30.1% |
| Mean travel time to work | 23.8 min±2.7 | 27.1 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 4009 compare with the other tracts in Norfolk County?
Among Norfolk County's tracts with a reliable estimate, Census Tract 4009 ranks as shown below (1 = highest).
| Measure | In Norfolk County | In Brookline |
|---|---|---|
| Population | 98th of 153 | 9th of 15 |
| Residents per square mile | 4th of 154 | 4th of 15 |
| Median household income | 143rd of 152 | 14th of 14 |
| Per capita income | 80th of 153 | 15th of 15 |
| Median home value | 39th of 153 | 15th of 15 |
| Median gross rent | 36th of 130 | 13th of 15 |
| Poverty rate | 6th of 89 | 2nd of 10 |
| Bachelor's degree or higher | 27th of 153 | 13th of 15 |
| Median age | 147th of 153 | 12th of 15 |
| Owner-occupied share | 138th of 153 | 10th of 15 |
The tracts next to it on Norfolk County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 4401.01 | 140th | $84,631±$26,680 · within the margin of this tract |
| Tract 4021.02 | 141st | $83,766±$8,469 · within the margin of this tract |
| Tract 4180.04 | 142nd | $82,271±$23,747 · within the margin of this tract |
| Tract 4009 | 143rd | $82,109±$27,737 |
| Tract 4132.01 | 144th | $81,140±$21,181 · within the margin of this tract |
| Tract 4561.02 | 145th | $79,894±$5,725 · within the margin of this tract |
| Tract 4563.02 | 146th | $73,011±$45,697 · 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 4009?
1 of the 18 figures for Census Tract 4009 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