PlainCities

Census tract · Middlesex County

Census Tract 3631.06, Middlesex County, Massachusetts

Census Tract 3631.06, GEOID 25017363106, in Middlesex County, Massachusetts, entirely within Acton. 3,126 residents in the ACS 2020-2024 5-year estimates (±248); the 2020 Census counted 3,330.

Residents, 2020-2024

3,126

±248 (90% margin)
2020 Census count: 3,330

Median household income

$107,150

±$20,156 (90% margin)
Middlesex County: $130,847

Median home value

$498,300

±$107,587 (90% margin)
Middlesex County: $727,800

Median gross rent

$2,774

±$367 (90% margin)
Middlesex County: $2,201

Where is Census Tract 3631.06?

Census Tract 3631.06 is one of 357 census tracts in Middlesex County, Massachusetts. It covers 1.91 square miles of land, 1,748 residents per square mile in 2020. Its GEOID, 25017363106, names it uniquely (how tract numbers and GEOIDs work).

Places Census Tract 3631.06 lies in (share of its 2020 census blocks)
PlaceShare of the tract
Acton100%
Census Tract 3631.06 (marked with a dot) in Middlesex County, Massachusetts. Boundaries: Census Bureau 2024.
31843241.0136213631.033631.05 3631.06 2 mi
Census Tract 3631.06 (shaded) and the tracts that border it, numbered. Boundaries: Census Bureau 2024 cartographic boundary file, 1:500,000.

5 census tracts border Census Tract 3631.06: Tract 3184 ($155,909), Tract 3241.01 ($135,147), Tract 3621 ($250,000 or more), Tract 3631.03 ($139,250) and Tract 3631.05 ($125,833). 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 3631.06?

The 2020-2024 American Community Survey puts Census Tract 3631.06's population at 3,126 (±248) in 1,401 households; the 2020 Census counted 3,330 residents and 1,436 housing units.

Counts, ACS 2020-2024 5-year estimates
MeasureTract 3631.06ActonMiddlesex CountyMassachusetts
Total population3,126±24824,1551,638,3657,044,056
Households1,401±879,409634,2152,785,042
Average household size2.20±0.162.552.492.44
Housing units1,401±879,575664,2673,030,406

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 3631.06?

The median resident of Census Tract 3631.06 is 41.3 years old; 20.9% are under 18 and 18.2% are 65 or older. The largest group is non-Hispanic white residents at 45.7%, then non-Hispanic Asian residents at 35.7%. 34.8% of residents were born outside the United States.

Age, origin, education, ACS 2020-2024 5-year estimates. Race groups are non-Hispanic; Hispanic includes any race.
MeasureTract 3631.06ActonMiddlesex CountyMassachusetts
Median age41.3±2.544.538.940.0
Under 18 years20.9%±4.3 pts23.2%19.5%19.4%
65 years and over18.2%±2.8 pts17.6%16.3%17.9%
Hispanic or Latino (any race)11.4%±7.3 pts4.1%9.3%13.3%
White alone, not Hispanic45.7%±7.2 pts58.9%65.1%66.6%
Black or African American alone, not Hispanic3.8%±3.4 pts4.7%4.7%6.4%
Asian alone, not Hispanic35.7%±6.9 pts25.5%13.6%7.3%
American Indian and Alaska Native alone, not Hispanic0.0%±1.3 pts0.0%0.1%0.1%
Native Hawaiian and Other Pacific Islander alone, not Hispanic0.0%±1.3 pts0.0%0.0%0.0%
Two or more races, not Hispanic1.7%±1.3 pts5.2%5.8%5.1%
Some other race alone, not Hispanic1.8%±2.2 pts1.7%1.4%1.2%
Born outside the United States34.8%±5.2 pts28.8%23.1%18.0%
Speak a language other than English at home (age 5+)46.7%±7.8 pts34.1%29.1%25.1%
Civilian veterans (age 18+)6.5%±2.8 pts4.4%3.3%4.3%
With a disability10.5%±4.6 pts9.1%9.9%12.3%
No health insurance coverage3.6%±2.6 pts1.7%2.4%2.6%
High school graduate or higher (age 25+)99.4%±0.9 pts98.0%93.2%91.4%
Bachelor's degree or higher (age 25+)77.7%±6.8 pts79.5%59.5%47.3%
Graduate or professional degree (age 25+)47.8%±6.8 pts47.6%30.5%21.8%
Lived in the same house a year earlier81.4%±8.5 pts87.9%87.2%88.3%

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 3631.06 earn?

Half of the 1,401 households in Census Tract 3631.06 earn less than $107,150 a year (±$20,156), against $130,847 across Middlesex County: 256th highest of the county's 350 tracts with a reliable estimate. 3.9% of residents live below the poverty line.

Income and poverty in 2024 dollars, ACS 2020-2024 5-year estimates
MeasureTract 3631.06ActonMiddlesex CountyMassachusetts
Median household income$107,150±$20,156$158,230$130,847$103,960
Mean household income$142,548±$14,881$208,786$178,070$144,950
Per capita income$63,621±$7,153$81,425$69,556$57,897
People below the poverty line3.9%±2.3 pts3.4%7.7%10.0%
Children under 18 below the poverty line3.2%±3.8 pts1.9%7.9%11.7%
Households receiving SNAP9.7%±5.9 pts3.9%9.3%14.7%
Households with a computer96.7%±2.5 pts98.3%97.0%95.7%
Households with a broadband subscription96.6%±2.9 pts97.2%94.7%92.8%

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 3631.06?

Owners occupy 47.1% of Census Tract 3631.06's occupied homes and renters 52.9%. The median owner-occupied home is valued at $498,300 by its owner (±$107,587). The median renter pays $2,774 a month including utilities, and 40.1% of renters pay 35% or more of their income on rent.

Housing, ACS 2020-2024 5-year estimates
MeasureTract 3631.06ActonMiddlesex CountyMassachusetts
Median home value (owner-occupied)$498,300±$107,587$807,300$727,800$562,100
Median gross rent$2,774±$367$1,986$2,201$1,762
Renters paying 35% or more of income on rent40.1%±14.1 pts44.0%37.6%41.8%
Median monthly owner costs, with a mortgage$2,852±$783$3,812$3,224$2,726
Owner-occupied homes47.1%±7.6 pts74.9%61.3%62.5%
Renter-occupied homes52.9%±7.6 pts25.1%38.7%37.5%
Housing units1,401±879,575664,2673,030,406
Single-family detached homes12.9%±5.5 pts63.3%46.5%51.1%
Mobile homes0.0%±3.0 pts0.0%0.4%0.8%
Built 2020 or later2.7%±2.0 pts0.4%1.2%1.0%
Built 2010 to 201910.3%±5.3 pts6.5%7.3%6.2%
Built 1939 or earlier1.5%±1.9 pts8.8%32.3%30.5%
Households with no vehicle6.9%±3.6 pts3.1%10.3%11.7%

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 3631.06 get to work?

50.9% of Census Tract 3631.06's workers drive alone and 36.3% work from home. The average trip to work takes 33.5 minutes.

Work and commuting, ACS 2020-2024 5-year estimates
MeasureTract 3631.06ActonMiddlesex CountyMassachusetts
In the labor force (age 16+)64.7%±4.8 pts69.7%69.9%67.0%
Unemployment rate3.7%±3.0 pts4.7%4.4%5.2%
Drove alone to work50.9%±9.9 pts52.7%54.2%61.2%
Carpooled7.6%±5.1 pts5.2%6.3%7.0%
Public transportation2.5%±2.2 pts3.3%7.2%6.5%
Walked0.0%±2.9 pts2.0%4.2%4.1%
Worked from home36.3%±9.6 pts35.9%24.7%18.6%
Mean travel time to work33.5 min±6.934.6 min29.9 min29.1 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 3631.06 compare with the other tracts in Middlesex County?

Among Middlesex County's tracts with a reliable estimate, Census Tract 3631.06 ranks as shown below (1 = highest).

Census Tract 3631.06's rank among the tracts of Middlesex County
MeasureIn Middlesex County
Population294th of 354
Residents per square mile267th of 357
Median household income256th of 350
Per capita income210th of 354
Median home value304th of 350
Median gross rent66th of 327
Poverty rate193rd of 223
Bachelor's degree or higher84th of 354
Median age155th of 354
Owner-occupied share244th of 351

The tracts next to it on Middlesex County's income ladder

Median household income, ACS 2020-2024 5-year estimates
TractRankMedian household incomeResidents
Tract 3514.04253rd$108,358±$14,283 · within the margin of this tract3,716
Tract 3215254th$107,912±$19,850 · within the margin of this tract7,561
Tract 3335.01255th$107,234±$24,086 · within the margin of this tract5,131
Tract 3631.06256th$107,150±$20,1563,126
Tract 3701.03257th$106,902±$17,864 · within the margin of this tract3,460
Tract 3741258th$106,458±$31,406 · within the margin of this tract5,301
Tract 3415259th$105,828±$9,247 · within the margin of this tract5,016

"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 3631.06?

1 of the 18 figures for Census Tract 3631.06 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