Census tract · Middlesex County
Census Tract 3651, Middlesex County, Massachusetts
Census Tract 3651, GEOID 25017365100, in Middlesex County, Massachusetts, entirely within Sudbury. 8,094 residents in the ACS 2020-2024 5-year estimates (±677); the 2020 Census counted 7,918.
Residents, 2020-2024
8,094
±677 (90% margin)
2020 Census count: 7,918
Median household income
$250,000 or more
The survey's top or bottom value; no margin is published
Middlesex County: $130,847
Median home value
$1,037,300
±$66,092 (90% margin)
Middlesex County: $727,800
Median gross rent
not published
Middlesex County: $2,201
Where is Census Tract 3651?
Census Tract 3651 is one of 357 census tracts in Middlesex County, Massachusetts. It covers 11.76 square miles of land, 673 residents per square mile in 2020. Its GEOID, 25017365100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Sudbury | 100% |
8 census tracts border Census Tract 3651: Tract 3231.01 ($175,220), Tract 3611 ($195,590), Tract 3612 ($192,279), Tract 3641.02 ($122,966), Tract 3652.01 ($225,853), Tract 3662.01 ($250,000 or more), Tract 3662.02 ($217,083) and Tract 9800*. 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 3651?
The 2020-2024 American Community Survey puts Census Tract 3651's population at 8,094 (±677) in 2,523 households; the 2020 Census counted 7,918 residents and 2,598 housing units.
| Measure | Tract 3651 | Sudbury |
|---|---|---|
| Total population | 8,094 ±677 | 19,306 |
| Households | 2,523 ±210 | 6,297 |
| Average household size | 3.21 ±0.18 | 3.04 |
| Housing units | 2,643 ±184 | 6,497 |
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 3651?
The median resident of Census Tract 3651 is 41.0 years old; 28.5% are under 18 and 14.2% are 65 or older. The largest group is non-Hispanic white residents at 83.5%, then non-Hispanic Asian residents at 9.8%. 12.2% of residents were born outside the United States.
| Measure | Tract 3651 | Sudbury |
|---|---|---|
| Median age | 41.0 ±1.9 | 42.3 |
| Under 18 years | 28.5% ±3.6 pts | 28.5% |
| 65 years and over | 14.2% ±2.5 pts | 15.5% |
| Hispanic or Latino (any race) | 0.4% ±0.7 pts | 3.7% |
| White alone, not Hispanic | 83.5% ±3.8 pts | 78.7% |
| Black or African American alone, not Hispanic | 0.0% ±0.5 pts | 0.5% |
| Asian alone, not Hispanic | 9.8% ±2.6 pts | 10.8% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.5 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.3% ±0.5 pts | 0.1% |
| Two or more races, not Hispanic | 5.0% ±2.8 pts | 4.9% |
| Some other race alone, not Hispanic | 1.0% ±0.9 pts | 1.2% |
| Born outside the United States | 12.2% ±3.0 pts | 12.9% |
| Speak a language other than English at home (age 5+) | 15.8% ±4.3 pts | 15.7% |
| Civilian veterans (age 18+) | 2.0% ±1.4 pts | 1.9% |
| With a disability | 3.1% ±1.5 pts | 5.4% |
| No health insurance coverage | 0.4% ±0.7 pts | 0.6% |
| High school graduate or higher (age 25+) | 98.5% ±1.1 pts | 98.7% |
| Bachelor's degree or higher (age 25+) | 90.0% ±3.5 pts | 83.3% |
| Graduate or professional degree (age 25+) | 49.1% ±5.3 pts | 45.7% |
| Lived in the same house a year earlier | 95.1% ±2.8 pts | 95.0% |
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 3651 earn?
Half of the 2,523 households in Census Tract 3651 earn less than $250,000 or more a year (), against $130,847 across Middlesex County: 1st highest of the county's 350 tracts with a reliable estimate.
| Measure | Tract 3651 | Sudbury |
|---|---|---|
| Median household income | $250,000 or more | $236,250 |
| Mean household income | $326,579 ±$40,288 | $289,498 |
| Per capita income | $102,898 ±$12,032 | $95,230 |
| People below the poverty line | 3.5% ±3.1 pts | 3.0% |
| Children under 18 below the poverty line | 3.8% ±4.4 pts | 2.0% |
| Households receiving SNAP | 1.3% ±1.2 pts | 3.3% |
| Households with a computer | 99.2% ±1.2 pts | 99.2% |
| Households with a broadband subscription | 99.2% ±1.2 pts | 98.5% |
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 3651?
Owners occupy 94.8% of Census Tract 3651's occupied homes and renters 5.2%. The median owner-occupied home is valued at $1,037,300 by its owner (±$66,092).
| Measure | Tract 3651 | Sudbury |
|---|---|---|
| Median home value (owner-occupied) | $1,037,300 ±$66,092 | $988,900 |
| Renters paying 35% or more of income on rent | 8.3% ±16.8 pts | 41.6% |
| Median monthly owner costs, with a mortgage | $4,000 or more | $4,000 or more |
| Owner-occupied homes | 94.8% ±3.9 pts | 89.9% |
| Renter-occupied homes | 5.2% ±3.9 pts | 10.1% |
| Housing units | 2,643 ±184 | 6,497 |
| Single-family detached homes | 94.9% ±2.9 pts | 83.8% |
| Mobile homes | 0.0% ±1.6 pts | 0.0% |
| Built 2020 or later | 1.7% ±1.4 pts | 2.6% |
| Built 2010 to 2019 | 5.7% ±2.8 pts | 10.2% |
| Built 1939 or earlier | 4.2% ±2.4 pts | 5.7% |
| Households with no vehicle | 0.0% ±1.7 pts | 2.2% |
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 3651 get to work?
51.7% of Census Tract 3651's workers drive alone and 40.2% work from home. The average trip to work takes 36.6 minutes. The unemployment rate in 2020-2024 averaged 3.9%.
| Measure | Tract 3651 | Sudbury |
|---|---|---|
| In the labor force (age 16+) | 59.9% ±4.9 pts | 63.9% |
| Unemployment rate | 3.9% ±2.4 pts | 4.2% |
| Drove alone to work | 51.7% ±7.4 pts | 57.5% |
| Carpooled | 2.2% ±2.0 pts | 3.5% |
| Public transportation | 2.7% ±2.7 pts | 2.4% |
| Walked | 0.4% ±0.6 pts | 1.1% |
| Worked from home | 40.2% ±7.0 pts | 33.0% |
| Mean travel time to work | 36.6 min ±2.8 | 34.6 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 3651 compare with the other tracts in Middlesex County?
Among Middlesex County's tracts with a reliable estimate, Census Tract 3651 ranks as shown below (1 = highest).
| Measure | In Middlesex County |
|---|---|
| Population | 6th of 354 |
| Residents per square mile | 329th of 357 |
| Median household income | 1st of 350 |
| Per capita income | 39th of 354 |
| Median home value | 61st of 350 |
| Bachelor's degree or higher | 10th of 354 |
| Median age | 163rd of 354 |
| Owner-occupied share | 20th of 351 |
The tracts next to it on Middlesex County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3384 | 1st | $250,000 or more |
| Tract 3385 | 1st | $250,000 or more |
| Tract 3572 | 1st | $250,000 or more |
| Tract 3583 | 1st | $250,000 or more |
| Tract 3585 | 1st | $250,000 or more |
| Tract 3587 | 1st | $250,000 or more |
| Tract 3621 | 1st | $250,000 or more |
| Tract 3651 | 1st | $250,000 or more |
| Tract 3662.01 | 1st | $250,000 or more |
| Tract 3671 | 1st | $250,000 or more |
| Tract 3672 | 1st | $250,000 or more |
| Tract 3735 | 1st | $250,000 or more |
| Tract 3736 | 1st | $250,000 or more |
| Tract 3737 | 1st | $250,000 or more |
| Tract 3739.01 | 1st | $250,000 or more |
| Tract 3743 | 1st | $250,000 or more |
| Tract 3744 | 1st | $250,000 or more |
| Tract 3861 | 1st | $250,000 or more |
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 3651?
3 of the 17 figures for Census Tract 3651 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