PlainCities

Census tract · Middlesex County

Census Tract 3251.01, Middlesex County, Massachusetts

Census Tract 3251.01, GEOID 25017325101, in Middlesex County, Massachusetts, entirely within Ayer. 4,195 residents in the ACS 2020-2024 5-year estimates (±400); the 2020 Census counted 4,010.

Residents, 2020-2024

4,195

±400 (90% margin)
2020 Census count: 4,010

Median household income

$148,258

±$30,814 (90% margin)
Middlesex County: $130,847

Median home value

$501,100

±$57,661 (90% margin)
Middlesex County: $727,800

Median gross rent

$1,863

±$374 (90% margin)
Middlesex County: $2,201

Where is Census Tract 3251.01?

Census Tract 3251.01 is one of 357 census tracts in Middlesex County, Massachusetts. It covers 4.25 square miles of land, 943 residents per square mile in 2020. Its GEOID, 25017325101, names it uniquely (how tract numbers and GEOIDs work).

Places Census Tract 3251.01 lies in (share of its 2020 census blocks)
PlaceShare of the tract
Ayer100%
Census Tract 3251.01 (marked with a dot) in Middlesex County, Massachusetts. Boundaries: Census Bureau 2024.
3241.023251.023261.017614.02 3251.01 2 mi
Census Tract 3251.01 (shaded) and the tracts that border it, numbered. Boundaries: Census Bureau 2024 cartographic boundary file, 1:500,000. Dashed: tracts outside Middlesex County.

4 census tracts border Census Tract 3251.01: Tract 3241.02 ($167,422), Tract 3251.02 ($74,973), Tract 3261.01 ($181,250) and Tract 7614.02 in Worcester County ($212,550). 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 3251.01?

The 2020-2024 American Community Survey puts Census Tract 3251.01's population at 4,195 (±400) in 1,658 households; the 2020 Census counted 4,010 residents and 1,750 housing units.

Counts, ACS 2020-2024 5-year estimates
MeasureTract 3251.01AyerMiddlesex CountyMassachusetts
Total population4,195±4008,6451,638,3657,044,056
Households1,658±1563,654634,2152,785,042
Average household size2.53±0.152.292.492.44
Housing units1,775±1453,891664,2673,030,406

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 3251.01?

The median resident of Census Tract 3251.01 is 37.4 years old; 21.5% are under 18 and 11.1% are 65 or older. The largest group is non-Hispanic white residents at 71.4%, then Hispanic or Latino residents (of any race) at 12.5%. 7.0% 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 3251.01AyerMiddlesex CountyMassachusetts
Median age37.4±2.339.238.940.0
Under 18 years21.5%±4.6 pts20.3%19.5%19.4%
65 years and over11.1%±1.8 pts14.5%16.3%17.9%
Hispanic or Latino (any race)12.5%±7.1 pts14.9%9.3%13.3%
White alone, not Hispanic71.4%±9.1 pts69.3%65.1%66.6%
Black or African American alone, not Hispanic3.8%±4.3 pts5.3%4.7%6.4%
Asian alone, not Hispanic6.8%±5.6 pts5.9%13.6%7.3%
American Indian and Alaska Native alone, not Hispanic0.0%±1.0 pts0.0%0.1%0.1%
Native Hawaiian and Other Pacific Islander alone, not Hispanic0.0%±1.0 pts0.0%0.0%0.0%
Two or more races, not Hispanic5.6%±4.3 pts4.6%5.8%5.1%
Some other race alone, not Hispanic0.0%±1.0 pts0.0%1.4%1.2%
Born outside the United States7.0%±4.0 pts10.0%23.1%18.0%
Speak a language other than English at home (age 5+)9.9%±3.7 pts14.0%29.1%25.1%
Civilian veterans (age 18+)6.2%±2.8 pts6.8%3.3%4.3%
With a disability13.4%±4.4 pts16.3%9.9%12.3%
No health insurance coverage3.4%±2.0 pts3.7%2.4%2.6%
High school graduate or higher (age 25+)98.0%±2.0 pts91.9%93.2%91.4%
Bachelor's degree or higher (age 25+)50.0%±8.4 pts42.3%59.5%47.3%
Graduate or professional degree (age 25+)22.9%±6.8 pts18.0%30.5%21.8%
Lived in the same house a year earlier90.7%±7.0 pts89.3%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 3251.01 earn?

Half of the 1,658 households in Census Tract 3251.01 earn less than $148,258 a year (±$30,814), against $130,847 across Middlesex County: 134th highest of the county's 350 tracts with a reliable estimate.

Income and poverty in 2024 dollars, ACS 2020-2024 5-year estimates
MeasureTract 3251.01AyerMiddlesex CountyMassachusetts
Median household income$148,258±$30,814$101,875$130,847$103,960
Mean household income$176,178±$24,265$137,670$178,070$144,950
Per capita income$69,052±$9,611$58,385$69,556$57,897
People below the poverty line7.3%±5.8 pts10.7%7.7%10.0%
Children under 18 below the poverty line13.5%±19.3 pts14.9%7.9%11.7%
Households receiving SNAP9.3%±8.8 pts11.5%9.3%14.7%
Households with a computer96.9%±3.3 pts94.9%97.0%95.7%
Households with a broadband subscription96.1%±3.4 pts90.8%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 3251.01?

Owners occupy 79.6% of Census Tract 3251.01's occupied homes and renters 20.4%. The median owner-occupied home is valued at $501,100 by its owner (±$57,661). The median renter pays $1,863 a month including utilities.

Housing, ACS 2020-2024 5-year estimates
MeasureTract 3251.01AyerMiddlesex CountyMassachusetts
Median home value (owner-occupied)$501,100±$57,661$463,800$727,800$562,100
Median gross rent$1,863±$374$1,415$2,201$1,762
Renters paying 35% or more of income on rent19.5%±17.2 pts20.1%37.6%41.8%
Median monthly owner costs, with a mortgage$2,740±$257$2,607$3,224$2,726
Owner-occupied homes79.6%±9.1 pts69.2%61.3%62.5%
Renter-occupied homes20.4%±9.1 pts30.8%38.7%37.5%
Housing units1,775±1453,891664,2673,030,406
Single-family detached homes57.2%±8.1 pts51.1%46.5%51.1%
Mobile homes0.0%±2.4 pts1.1%0.4%0.8%
Built 2020 or later0.0%±2.4 pts0.9%1.2%1.0%
Built 2010 to 201919.0%±5.8 pts11.4%7.3%6.2%
Built 1939 or earlier5.9%±4.1 pts20.7%32.3%30.5%
Households with no vehicle3.3%±3.4 pts3.8%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 3251.01 get to work?

71.1% of Census Tract 3251.01's workers drive alone and 23.9% work from home. The average trip to work takes 36.1 minutes.

Work and commuting, ACS 2020-2024 5-year estimates
MeasureTract 3251.01AyerMiddlesex CountyMassachusetts
In the labor force (age 16+)79.7%±5.4 pts74.8%69.9%67.0%
Unemployment rate9.3%±8.5 pts7.0%4.4%5.2%
Drove alone to work71.1%±10.1 pts70.4%54.2%61.2%
Carpooled2.2%±2.0 pts2.9%6.3%7.0%
Public transportation2.2%±2.5 pts3.6%7.2%6.5%
Walked0.6%±0.9 pts0.7%4.2%4.1%
Worked from home23.9%±10.2 pts21.6%24.7%18.6%
Mean travel time to work36.1 min±4.033.0 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 3251.01 compare with the other tracts in Middlesex County?

Among Middlesex County's tracts with a reliable estimate, Census Tract 3251.01 ranks as shown below (1 = highest).

Census Tract 3251.01's rank among the tracts of Middlesex County
MeasureIn Middlesex County
Population202nd of 354
Residents per square mile312th of 357
Median household income134th of 350
Per capita income169th of 354
Median home value302nd of 350
Median gross rent230th of 327
Bachelor's degree or higher239th of 354
Median age231st of 354
Owner-occupied share94th 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 3821131st$148,750±$10,638 · within the margin of this tract4,826
Tract 3566.01132nd$148,506±$10,777 · within the margin of this tract4,103
Tract 3567.01133rd$148,363±$20,003 · within the margin of this tract6,450
Tract 3251.01134th$148,258±$30,8144,195
Tract 3173.02135th$147,596±$26,623 · within the margin of this tract5,677
Tract 3704.02136th$147,500±$47,733 · within the margin of this tract1,409
Tract 3354137th$147,031±$25,894 · within the margin of this tract5,398

"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 3251.01?

3 of the 18 figures for Census Tract 3251.01 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